Headsets and headphones / Compare

CMF Headphone Pro vs Sennheiser HDB 630

A

Product A: CMF

Headphone Pro

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B

Product B: Sennheiser

HDB 630

92 of 161 known

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Only differences

ACMF Headphone Pro

BSennheiser HDB 630

General

3 of 8 differ

Series

Not available

Not available

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

B175, 69744342267221Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026Original manufacturer FCC manual identifies B175. Current US maker variant payload labels Dark Grey SKU 6974434226722. The numeric SKU is not stored as a GTIN without a barcode label.26Maker spec sheet (PDF)s3.zoommer.ge/site/certificate/nothing-cmf-headphone-pro.pdfRead 8 October 2026The signed original maker EU Declaration of Conformity identifies physical model B175 and battery M653035. Regulatory model identity is independent of the US color SKU. The signature date is not a retail release date.

HDBT, 800164, 8001532Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Regulatory HDBT from exact manual. Current Lunar Silver 800164 / UPC 810091276273 and Black 800153 / UPC 810091276099 directly joined in public maker SKU rows. Legacy 700445 remains in old specification text but is not added to current variant rows. No assumption that old commercial barcode identifies the new box.

GTIN / EAN

Not available

810091276273, 8100912760992Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

29 September 202518Reviewsoundguys.com/the-cmf-headphone-pro-packs-high-end-specs-for-a-low-price-tag-145307Read 8 October 2026The September 29, 2025 launch report documents the announcement and separates UK/EU same-day availability from October 7 US availability. The partner press release corroborates the regional sales dates.

8 October 20257Press releasenewsroom.sennheiser.com/audiophile-sound-cut-loose-lyf8raRead 5 October 2026Maker dateline October 8, 2025 announcing HDB 630, with October 21 planned shipment. Newsroom header October 7 differs by publication timing, dateline used. Planned shipping not used alone as actual retail.

Status

Available1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact Dark Grey US variant payload states availableForSale true.

Available2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Exact public maker variants both available true. Current selling prices are not used as launch evidence.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$9916Press releasestorage.mfn.se/194a0e7c-3d3b-4dc0-bde1-0e70c39715f9/audiodo-and-cmf-by-nothing-expand-partnership-with-new-headphone-pro.pdfRead 8 October 2026The September 30, 2025 Audiodo maker-partner release expressly lists USD 99 and US sales beginning October 7, 2025. Current retail prices and EU regional pricing are not substituted.

$499.959Press releasenewsroom.sennheiser.com/audiophile-sound-cut-looseRead 5 October 2026Original international maker launch release Availability explicitly states MSRP 499.95 USD. This is launch MSRP, not the current store amount or reviewer metadata. EUR tax scope unproved and omitted.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

Not available

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The current US maker store offers the exact Dark Grey reference.

US5Reviewsoundguys.com/sennheiser-hdb-630-review-audiophile-anc-at-a-cost-146569Read 5 October 20269Press releasenewsroom.sennheiser.com/audiophile-sound-cut-looseRead 5 October 2026Maker explicitly publishes the US suggested retail price. Current exact US storefront independently confirms the marketed US configuration.

ColoursiThe maker's own colour names

Dark Grey1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The reference is the original Dark Grey headset with its fitted Dark Grey cushions. Other headset finishes and separately sold cushion colors are excluded.

Lunar Silver, Black2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026

Segment

Music1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker positions the product for music listening and audio playback.

Music7Press releasenewsroom.sennheiser.com/audiophile-sound-cut-loose-lyf8raRead 5 October 2026Maker launch describes audiophile music listening, consumer travel and voice calls.

Design

0 of 7 differ

Form factor

Over-ear1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly describes its first over-ear headphones.

Over-ear1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Ear cup enclosureiClosed, open or semi-open acoustic enclosure. This does not describe how the headset folds.

Closed11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact Acoustic Design field states Closed-back. Tom's Guide specifications corroborate this.

Closed1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Wearing style

Headband1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker comfort section describes the adjustable headband. The original guide documents adjustment by sliding the arms.

Headband1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

FoldingiFlat means the ear cups rotate flat. Inward means the ear cups fold toward the headband.

Flat12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact review states that the headphones rotate flat for storage but do not fold inward.

Flat5Reviewsoundguys.com/sennheiser-hdb-630-review-audiophile-anc-at-a-cost-146569Read 5 October 2026Exact review says headphones fold flat into case, not inward into a compact headband. Current manual page 43 generic fold up wording interpreted with exact flat photograph and maker flat dimensions.

Swivelling ear cupsiEar cups can rotate relative to the headband. Tilting alone does not count.

Yes12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact design discussion explicitly describes flat rotation of the ear cups.

Yes5Reviewsoundguys.com/sennheiser-hdb-630-review-audiophile-anc-at-a-cost-146569Read 5 October 2026Review flat-fold description with current manual storage diagram. RTINGS public Travel paragraph explicitly earcups swivel.

RGB lighting

Not available

Not available

Lighting zonesiNumber of independently controllable lighting areas across both ear cups.

Not available

Not available

Drivers and sound

12 of 20 differ

Driver type

Dynamic11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications explicitly state Dynamic driver. Voice-coil material alone is not used as transducer-type proof.

Dynamic1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Driver sizeiDiameter of the largest sound driver. Do not use the microphone capsule diameter.

40mm1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Drivers table and Packed with Power section state 40 mm. The 16.5 mm copper voice coil is not a driver diameter.

42mm1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Drivers per sideiNumber of sound-producing transducers in one side, excluding microphones.

Not available

Not available

Diaphragm material

PEN+PU dome with nickel plating1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Diaphragm table states PEN+PU dome material and nickel plating. Magnet material is not stated.

Not available

Magnet

Not available

Not available

Frequency response (wired or passive)iPublished acoustic range for wired listening, or the maker’s single range when no mode is distinguished. Power state and test standard belong in the source note.

Min20 HzMax20 kHz11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications state 20 to 20,000 Hz acoustic frequency response. Tom's Guide independently labels the same frequency response. No mode, tolerance, or test level is stated. The maker's ambiguous RF label is not used as transmission bandwidth proof.

Min6 HzMax40 kHz2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Exact current maker table and newer manual page 48: 6 Hz-40 kHz using Line-In, USB at 96 kHz, or Bluetooth aptX Adaptive at 96 kHz. Other settings 6 Hz-22 kHz. Older launch sheet limited analog/Bluetooth to 22 kHz, so current exact conditions take precedence.

Wireless audio transmission bandiFrequency range of audio transmitted over the wireless connection, not the acoustic response of the driver. Codec, sampling rate and bitrate conditions belong in the source note. When the maker gives a range per codec, the widest range is stored and its codec goes in the source note.

Not available

Not available

Impedance (passive when specified)iUse the headset-off value for a passive analog connection when the maker publishes both powered and passive values. Note the power state and test frequency.

16Ω11Spec databasesoundguys.com/product/cmf-by-nothing-headphone-proRead 8 October 2026The exact product specifications state 16 ohms. The Tom's Guide specification table agrees. Frequency and powered/passive measurement state are unspecified. Unverified comparison sites give conflicting figures and are excluded.

480Ω1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Maker explicitly active 480 ohms. Headphones require power even on analog input. No passive impedance exists in the table.

Sensitivity (passive when specified)iUse the headset-off figure when both powered and passive values exist. The power or voltage reference, test distance and frequency belong in the source note.

Not available

105dB1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026105 dB SPL at 1 kHz / 0 dBFS. No per-1-mW or per-1-V sensitivity reference assigned.

Sensitivity referenceiPublished power or voltage reference for sensitivity. Do not assume 1 mW when the source gives only a dB value.

Not available

Not available

THD (claimed)iPublished distortion figure or numerical upper bound. The source note states any less-than sign and test level.

Not available

0.2%1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Advertised strict upper bound below 0.2 percent at 1 kHz / 100 dB SPL. Stored 0.2 is the published ceiling, not a measured result.

Max input power

Not available

Not available

Max digital audio sample rateiHighest supported digital audio sample rate over a USB cable or wireless dongle. This is not the microphone rate or acoustic frequency response.

Not available

96kHz2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Maximum playback resolution 24-bit/96 kHz through USB-C or compatible aptX Adaptive source, including supplied BTD 700. Hi-res mode must be enabled in app. Not a claim that every codec supports this format.

Max digital audio bit depthiHighest published digital playback bit depth over a USB cable or wireless dongle.

Not available

24bits2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Maker explicit playback maximum 24 bits. No microphone recording format inferred.

DAC

Not available

Not available

Personalised soundiA manufacturer-supported hearing test or ear scan creates a device sound profile tailored to the listener. Generic equalizer adjustments do not count.

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact maker Personal Sound feature uses Audiodo to create a hearing profile through a three-minute test in Nothing X. The resulting profile is stored directly on the headphones and remains applied across connected devices. This is hearing-test personalization, separate from the manual three-band equalizer and Energy Slider.

Not available

Onboard EQiCustom playback EQ profiles stored in the headset and applied without the host app running. Note supported active connections. Receiver-only or software-only EQ does not count.

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 40 expressly EQ effects stored in headphones and active without app on a different Bluetooth source.

Custom EQ bandsiNumber of bands in the custom playback equalizer. Microphone EQ bands are excluded.

312Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact reviewer reports a three-band custom EQ in Nothing X. Firmware 1.0.1.40. No advanced Headphone (1) parametric EQ is transferred.

56Reviewrtings.com/headphones/reviews/sennheiser/hdb-630Read 5 October 2026Public Office Work verdict explicitly five-band parametric EQ. Crossfeed is separate, not a virtual surround license or sixth EQ band.

EQ presets

Pop, Rock, Electronic, Enhance Vocals, Classical20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact equalizer support article names five default profiles: POP, ROCK, ELECTRONIC, ENHANCE VOCALS, and CLASSICAL. Custom mode is not counted as a named preset. Marketing prose calls six preset EQs but does not name a sixth.

Not available

Volume limit

Not available

Not available

Spatial audio

1 of 3 differ

Spatial audio supportiNamed headset or host spatial-audio systems that the maker or reviewer explicitly supports. A platform feature may require compatible hardware, software or a separate licence.

Static Spatial Audio: Cinema mode, Static Spatial Audio: Concert mode1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly names Static Spatial Audio with Cinema and Concert modes. These are supported headphone processing modes. No Dolby license or dynamic head tracking is inferred.

Not available

Spatial audio licence includediA paid spatial-audio licence is bundled or embedded. Compatibility with a separately purchased app does not count.

Not available

Not available

Head tracking

Not available

Not available

Noise cancelling

4 of 10 differ

Active noise cancelling

Yes5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact support article explicitly confirms Active Noise Cancellation.

Yes1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

ANC typeiFeedforward uses outside microphones. Feedback uses inside microphones. Hybrid uses both. Voice-call noise filtering is separate.

Hybrid1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Noise Cancellation Type table states Hybrid ANC.

Hybrid1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

ANC microphonesiTotal microphones used for active playback noise cancellation across both sides. Do not substitute the total physical or voice microphone count.

Not available

43Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 8 explicitly two outward and two inward ANC microphones, four physical capsules. Separate from four voice microphones on page 7.

Adaptive ANCiNoise cancellation automatically changes with the environment or fit. Manually choosing a level does not count.

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explains automatic movement between strong, moderate, and light cancellation based on surroundings. Adaptive is not counted as an extra manual strength level.

Yes1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

ANC levelsiNumber of adjustable cancellation strength steps. Off and transparency modes are excluded.

315Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact ANC discussion names Low, Mid, High, and Adaptive within ANC On. Only the three fixed strength levels are counted. Adaptive, Transparency, and Off are excluded.

Not available

ANC attenuation (claimed)

40dB5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact ANC support article states up to 40 dB. Frequency, weighting, and test method for this maximum are unspecified. The technical table also lists 2000 Hz as Frequency range, which does not establish a measurement frequency. The separate 99% marketing limit is not converted to dB.

Not available

Transparency mode

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker expressly documents Transparency Mode to hear surroundings.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Adjustable transparency

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 33 pinch gestures or app slider adjusts ANC and transparency intensity. No numeric level count inferred.

Conversation detectioniAudio pauses or lowers automatically when the wearer speaks. Voice assistant activation does not count.

Not available

Not available

Wind noise reduction

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Noise Cancellation Features table states Wind Noise Conduction Mesh. This is a physical mesh feature, not an inferred selectable wind-processing mode.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 34 explicitly selectable Wind noise reduction Off, Auto or Max. These are wind-control modes, not ANC attenuation levels.

Measured

4 of 21 differ

Frequency response notesiMeasured by a reviewer, not claimed by the maker

Changing the bass slider from minimum to maximum increases low-frequency output. The reviewer reports upper-frequency roll-off above about 8 kHz.12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026SoundGuys compares minimum and maximum bass-slider responses against its preference curve. Firmware 1.0.1.40. Host and codec are unspecified. The reported approximately 8 dB slider difference is not converted into a target-relative averaged bass metric.

Not available

Bass amountiReviewer’s bass deviation from its stated target. Positive is more bass. Target and test method belong in the source note.

Not available

Not available

Treble amountiReviewer’s treble deviation from its stated target. Positive is more treble. Target and test method belong in the source note.

Not available

Not available

Deviation from targetiReviewer’s full-range error from its target curve. Do not substitute a regional bass or treble error.

Not available

Not available

Consistency between fittingsiReviewer’s standard deviation across repeated fittings. Test rig and fitting procedure belong in the source note.

Not available

Not available

Harmonic distortioniIndependently measured harmonic distortion, with test level and method in the source note.

Not available

Not available

Sound leakageiIndependently measured leakage at 30 cm. Playback level and method belong in the source note.

Not available

Not available

Measured noise isolationiIndependently measured attenuation. Positive values mean more noise reduction. ANC state, rig and frequency bands belong in the source note.

Not available

Not available

Noise isolation (measured, best)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Passive isolation (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic quality notesiMeasured by a reviewer, not claimed by the maker

Recorded calls remain intelligible, but speech sounds unnatural and includes some pops and crackles.12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The exact reviewer reports intelligible speech and noise rejection with some pops and crackles. Recordings cover ideal, office, street, wind, and reverberant conditions. Firmware 1.0.1.40. Host, codec, and call processing settings are unspecified.

Not available

Mic low-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic high-frequency extensioniMeasured by a reviewer, not claimed by the maker

Not available

Not available

Mic speech-to-noise ratioiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Measured latencyiEnd-to-end latency measured by a reviewer for a specific connection, platform and codec. Firmware, method and operating mode belong in the source note.

Not available

Not available

Bluetooth latency (measured, worst)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

2.4 GHz latency (measured, worst)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Measured battery lifeiReviewer’s continuous playback test. State the connection, ANC and lighting where known. Unknown settings stay omitted and are described in the source note.

ACMF Headphone Pro

ANC	Hours (h)
Yes	43.15
Yes	49.5

Source12Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026First row: SoundGuys standardized test measured 43 hours 9 minutes with ANC on. Firmware 1.0.1.40, one-week supplied review unit. Connection, host, codec, playback level, and ANC strength are unspecified. Second row has a separate TechRadar source below.14Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026TechRadar depleted a full battery and measured 49.5 hours with ANC enabled during its four-week review. Its source devices include MacBook Pro, iPhone 15 Pro Max, and FiiO M15S, but the exact battery-test connection, codec, volume, ANC strength, and firmware are unspecified. The separate row is not pooled with SoundGuys.

BSennheiser HDB 630

Connection	Hours (h)
Bluetooth	53.77

Source5Reviewsoundguys.com/sennheiser-hdb-630-review-audiophile-anc-at-a-cost-146569Read 5 October 2026Company-provided unit tested over two weeks. Battery result 53 h 46 min added November 6, 2025, stored 53.77 h rounded. Firmware/app version, codec and ANC state not reported for this run, left unknown. No partial-battery extrapolation from Tom Guide workday percentages.

Battery life (measured, max)iMeasured by a reviewer, not claimed by the maker

49.5h=CalculatedFrom Measured battery life

53.77h=CalculatedFrom Measured battery life

Clamping forceiMeasured by a reviewer, not claimed by the maker

Not available

Not available

Weight (measured)iIndependently weighed headset. A review that repeats the maker’s number does not qualify. Cable and microphone inclusion belong in the source note.

Not available

Not available

Microphone

8 of 16 differ

MicrophoneiMain microphone used for speech. Secondary internal microphones may be described in the source note.

Built-in6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The controls and call documentation describe the on-headphone microphone, including its configurable on/off function. No detachable boom is supplied.25Reviewrtings.com/headphones/reviews/cmf/headphone-proRead 8 October 2026The exact public Office Work verdict explicitly describes an integrated microphone. No boom or in-line microphone is substituted.

Built-in1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Microphone element

Not available

MEMS1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Microphone pickup patterniUse the maker’s exact named pattern. Unidirectional does not establish whether the capsule is cardioid, supercardioid or hypercardioid.

Not available

Omnidirectional3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 48 explicitly four omnidirectional speech microphones in 2x2 beamforming array. Capsule pattern is not the processed beamforming output pattern.

Voice microphonesiTotal microphones used for voice pickup or beamforming across both sides. ANC-only microphones are excluded.

31Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The feature table states a three-microphone ENC architecture for calls. Its separate five-microphone total is not substituted for this voice count or an unproven ANC count.

41Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Exact maker table says two speech microphones per side, total four. Current manual device diagram page 7 and specifications page 48 also explicitly four. ANC microphones counted separately.

Total microphonesiEvery physical microphone across the headset, including call, ANC and calibration microphones. Shared microphones count once. Excludes microphones in charging cases or receivers, and vibration sensors. Use an explicitly published physical total, never a sum of overlapping role counts.

528Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact maker Noise Cancellation technical table explicitly states 5 MICS TOTAL. This is the complete physical headset total. The separate three-microphone ENC call architecture remains a voice-role count, and no ANC count is derived from those overlapping roles.

Not available

Mic frequency responseiAcoustic microphone response, not its digital sampling rate. Connection-specific ranges belong in the source note.

Not available

Min50 HzMax10 kHz1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Manual page 48 adds -3 dB condition to same 50 Hz-10 kHz maker speech range.

Mic sensitivityiPublished microphone sensitivity. Reference such as dBV/Pa or dBFS, frequency and distance belong in the source note.

Not available

Not available

Mic signal-to-noiseiPublished microphone signal-to-noise ratio. Minimum or typical conditions belong in the source note.

Not available

Not available

Mic sample rateiExplicitly published digital microphone capture or speech sampling rate. State the audio route in the source note, or say it is unpublished. Internal capture does not prove the effective rate on every connection. Acoustic bandwidth, playback rate and generic microphone-chip capability do not qualify.

Not available

Not available

Mic noise reductioniProcessing that removes noise from transmitted speech. Playback ANC and a directional microphone alone do not count.

Not available

Not available

Flip to mute

Not available

Not available

Mute button

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The support controls list explicitly includes Mic on/off as an optional configurable button function on all platforms. This requires selecting the function in the app.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 36 multifunction button once toggles microphone while in call. Shared context-sensitive button, not dedicated mute hardware. BTD 700 also has its own separate mute control.

Mute indicatoriPublished indication of microphone mute. mechanical_marker is a visible physical marker showing the microphone's mute-switch position. LED options require an electronic light. The in-line controller option is for a mute light on a cable remote.

Not available

Voice prompt3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Headphone Mute on / Mute off voice prompts page 36. Adapter red LED page 37 is not classified as a headphone cup or microphone LED.

Sidetone

No13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact Don't buy section explicitly says the product lacks sidetone for hearing your own voice during calls.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Adjustable sidetone

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Comfort Call page 37 own-voice playback can be enabled/disabled in app. No continuous intensity slider asserted.

Foam microphone windscreeniA foam cover for the voice microphone. An internal metal mesh pop filter does not count.

Not available

Not available

Connectivity

11 of 20 differ

Audio connectionsiConnections that carry playback audio. Charging or firmware USB alone does not count as USB audio.

Analog, Bluetooth5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Audio formats and wired connection articles document Bluetooth and analog AUX playback. USB-C is charging only.

Analog, USB, Bluetooth3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Analog source plugsiAnalog plug(s) supplied for the source device, including adapters. The headset-side jack is listed separately.

Not available

3.5 mm TRS3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 5 stereo 3.5 mm source and 2.5 mm headphone plugs. Analog mode disables Bluetooth, call controls and headphone microphone functions, page 41. No TRRS microphone cable asserted.

Cable connector on headsetiConnection used by the playback cable at the headset. A fixed cable is not replaceable through a headset jack.

3.5 mm10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original guide expressly labels the left ear cup 3.5 mm Audio In.

2.5 mm3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Longest included cableiLength of the longest supplied cable, including charging and dongle cables. Individual cable lengths are listed in Cables included.

1.2m1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker package inventory contains only the supplied 1.2 m analog cable. The reviewer's approximate 2.7-foot cable description does not override the manufacturer claim.

1.2m3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Headset USB plug or portiUSB plug or port on the headset or its included wired audio adapter. A charging-only USB port can appear here.

USB-C10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original English Quick Start Guide identifies USB-C Charge In on the right ear cup.

USB-C3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Audio over USB-C cableiPlayback through a USB-C cable or included wired USB-C audio adapter. A charging-only USB-C port does not count.

No5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact wired connection article expressly says 3.5 mm aux-in is supported and USB-C Audio is not.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 42 explicitly USB playback plus microphone recording on Mac/PC/mobile device, with simultaneous charging. Bluetooth should be disconnected first.

Passive wired listeningiAnalog playback works with the headset powered off or its battery empty. An active analog converter that needs headset power does not count.

No13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact review explicitly states that wired 3.5 mm listening requires the headphones powered on and does not work passively.

No6Reviewrtings.com/headphones/reviews/sennheiser/hdb-630Read 5 October 2026Public Wired Gaming verdict explicitly headphones must be powered on even via analog cable. Active analog converter requires battery. No gated measurements accessed.

Wireless receiveriDedicated wireless audio receiver or dongle. A wired USB sound card does not count.

Not available

Included3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 5 exact BTD 700 USB-C Bluetooth transmitter included. It is not a proprietary 2.4 GHz headset connection. No USB-A adapter in this exact box list.

Wireless receiver connectoriPhysical USB connector on the receiver. Supplied extension cables and adapters are explained in the source note. Both means two native connector types.

Not available

USB-C3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Wireless range (claimed)iMaker’s advertised wireless range. Connection and indoor or outdoor conditions belong in the source note. Measured distance is not stored here.

10m1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Connection range table states 10 m. Indoor or line-of-sight test conditions are not specified. The Tom's Guide generic Bluetooth 800-foot statement is excluded.

Not available

Bluetooth

5.45Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Bluetooth version article states Bluetooth 5.4.

5.21Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Headphones Bluetooth 5.2. Included BTD 700 adapter Bluetooth 5.4 is different hardware and is not the headphones version.

Bluetooth codecsiNamed Bluetooth audio codecs supported by this exact model. Host, firmware and operating-mode restrictions belong in the source note.

SBC, AAC, LDAC5Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Audio formats article expressly lists SBC, AAC, and LDAC. iOS lacks LDAC support according to the separate LDAC instructions.6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact LDAC instructions state 96 kHz, 24-bit, and 990 kbps for Bluetooth streaming with a compatible Android phone and high-quality audio enabled. Higher-bitrate LDAC recommends disabling Dual Connection. These limits apply to LDAC Bluetooth playback. The headset does not support USB-C cable audio.

SBC, AAC, aptX, aptX HD, aptX Adaptive1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Headphone codecs SBC/AAC/aptX/aptX HD/aptX Adaptive. BTD 700 supports additional LC3 and aptX Lossless with other compatible devices, but these are not asserted for HDB 630.

LE AudioiLE Audio playback support. Bluetooth Low Energy for app control alone does not count.

Not available

Not available

AuracastiAuracast broadcast audio support. Required phone, firmware and app conditions belong in the source note.

Not available

Not available

Bluetooth multipointiCan remain connected to multiple Bluetooth source devices at once. Mixing Bluetooth with a proprietary dongle is a separate field. A maker's dual connection to two Bluetooth devices at once counts.

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact Dual Connection instructions document two simultaneous Bluetooth source connections with audio switching. This is disabled by default and requires enabling in Nothing X.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 19 two active Bluetooth sources, one audio stream at a time, six stored pairing profiles. BTD 700 itself stores one headset and should not be confused with headset pairing memory.

Multipoint devicesiNumber of Bluetooth source devices connected at once, not the number remembered for later pairing.

26Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The instructions repeatedly specify two connected devices. A third device can preempt one connection. This is not three simultaneous devices or pairing memory.

23Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Paired devices remembered

Not available

63Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Mixes 2.4 GHz and Bluetooth audioiPlays both wireless audio streams at the same time. Automatic switching or Bluetooth standby does not count.

Not available

Not available

Fast pairing

Google Fast Pair, Microsoft Swift Pair23Maker product pagesupport.nothing.tech/hc/en-us/articles/38910344910225-Does-CMF-Headphone-Pro-support-Google-Fast-PairRead 8 October 2026The exact product support article explicitly confirms the named quick-pairing feature. Google Fast Pair needs a compatible Android source. Microsoft Swift Pair is the Windows route. Neither adds USB audio.24Maker product pagesupport.nothing.tech/hc/en-us/articles/38910328918545-Does-CMF-Headphone-Pro-support-Mircosoft-Swift-PairRead 8 October 2026The exact product support article explicitly confirms the named quick-pairing feature. Google Fast Pair needs a compatible Android source. Microsoft Swift Pair is the Windows route. Neither adds USB audio.

Not available

Base station

Not available

Not available

Latency

1 of 2 differ

Low latency modeiA selectable mode intended to reduce audio delay. A low-latency connection without a distinct mode does not count.

Yes7Maker product pagesupport.nothing.tech/hc/en-us/articles/38910343614737-Does-CMF-Headphone-Pro-support-low-latency-modeRead 8 October 2026The exact support article confirms low-latency mode.

Yes4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026Exact HDB 630 FAQ troubleshooting says triple-press supplied BTD 700 button triggers gaming/low-latency mode and scales 96 kHz down to 48 kHz. This is the matched adapter route, not native proprietary 2.4 GHz. No generic dongle 30 ms claim borrowed.

Claimed latencyiMaker’s claimed delay for the stated connection and mode. Minimum claims and host restrictions belong in the source note.

ACMF Headphone Pro

Connection	Mode	Latency (ms)
Bluetooth	Game Mode on Nothing Phone	120

Source7Maker product pagesupport.nothing.tech/hc/en-us/articles/38910343614737-Does-CMF-Headphone-Pro-support-low-latency-modeRead 8 October 2026The maker states less than 120 ms when connected to a Nothing Phone in Game Mode. The stored value is the upper bound of that claim, not a measured result. Codec and firmware are unspecified. Generic analog zero-latency reviewer prose is not stored as an end-to-end result.

BSennheiser HDB 630

Connection	Mode	Latency (ms)
Bluetooth	aptX Adaptive	80
USB	Audio playback maximum	40
Analog	Aux without microphone	30

Source4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026Exact HDB 630 gaming FAQ states aptX Adaptive 80 ms from Qualcomm, USB audio max 40 ms and aux 30 ms without microphone. USB microphone separate max 40 ms excluded from playback rows. Host/test method unspecified, these are manufacturer claims, not lab measurements.

Compatibility

2 of 3 differ

Compatible platformsiPlatforms with a documented audio path. This does not imply every connection or microphone function works. Platform editions must be checked individually.

Android, iOS, Windows, macOS20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026Exact maker compatibility support names Android 6.0 or later and iOS 13 or later. Swift Pair support and exact SoundGuys setup instructions establish Windows Bluetooth. The exact Tom's Guide reviewer listened through the supplied analog cable on a MacBook Air M2. No console route is inferred from a physical jack.21Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026Exact maker compatibility support names Android 6.0 or later and iOS 13 or later. Swift Pair support and exact SoundGuys setup instructions establish Windows Bluetooth. The exact Tom's Guide reviewer listened through the supplied analog cable on a MacBook Air M2. No console route is inferred from a physical jack.

Windows, macOS, Android, iOS3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Connection per platformiOnly explicitly documented playback paths for the exact model. Microphone support is separate. Leave unknown microphone support omitted. An Xbox and a PlayStation edition of one headset can connect differently, so it is per variant.

ACMF Headphone Pro

Platform	Connection	Microphone works
Android	Bluetooth	Yes
iOS	Bluetooth	Yes
Windows	Bluetooth	Not available
macOS	Analog	No

Source20Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026Android/iOS Bluetooth playback and voice calls are explicitly documented by maker compatibility and controls articles. Windows Bluetooth is documented by exact Swift Pair and reviewer pairing instructions. The exact Tom's Guide reviewer used analog playback on a MacBook Air M2 and explains that the supplied cable does not carry headphone microphone calls. Unknown Windows microphone behavior is omitted.21Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026Android/iOS Bluetooth playback and voice calls are explicitly documented by maker compatibility and controls articles. Windows Bluetooth is documented by exact Swift Pair and reviewer pairing instructions. The exact Tom's Guide reviewer used analog playback on a MacBook Air M2 and explains that the supplied cable does not carry headphone microphone calls. Unknown Windows microphone behavior is omitted.

BSennheiser HDB 630

Platform	Connection
Windows	USB
macOS	USB
Windows	Bluetooth
macOS	Bluetooth
Android	Bluetooth
iOS	Bluetooth

Source3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Mac/PC USB digital playback and recording page 42, Bluetooth smartphone and PC/Mac call sections, and included BTD 700 host compatibility page 49 (Windows 10+, macOS 11/12, Android 13+, USB-C iPhone/iPad). Generic mobile USB does not establish all headphone USB routes on every phone.

Official licence

Not available

Not available

Battery and charging

9 of 13 differ

Battery capacityiRated capacity of one headset battery. Do not use case, receiver or total multi-battery capacity.

720mAh4Maker product pagesupport.nothing.tech/hc/en-us/articles/38910303499409-What-is-the-battery-capacity-of-CMF-Headphone-ProRead 8 October 2026The exact support article states 720 mAh. The maker technical table agrees. Rated versus typical capacity is not specified. This is the headset battery, not a nonexistent case battery.

700mAh1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026700 mAh at 3.7 V in sheet and manual, which coherently equals 2.59 Wh. Sheet rounded energy 2.7 Wh differs, so no energy field inferred.

Swappable batteryiBattery can be exchanged by the user as part of normal operation. Service or recycling disassembly does not count.

No10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original English safety section expressly instructs users not to replace the battery themselves. Normal battery hot swapping is unsupported.

No4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026Exact FAQ explicitly batteries cannot be exchanged, sealed embedded pack. Professional service is separate from user swapping.

Batteries includediNumber of headset batteries supplied, including the one already installed.

Not available

11Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Page 3 battery table one single physical cell installed, none outside product.

Claimed battery lifeiMaker’s maximum playback time per stated connection, codec, ANC, spatial audio and lighting settings. Name the spatial processing mode and other conditions in the source note. Unknown settings stay omitted.

ACMF Headphone Pro

Connection	ANC	Codec	Hours (h)
Bluetooth	No	AAC	100
Bluetooth	Yes	AAC	50
Bluetooth	No	LDAC	70
Bluetooth	Yes	LDAC	38

Source2Maker product pagesupport.nothing.tech/hc/en-us/articles/38910279111569-What-s-the-battery-life-of-CMF-Headphone-ProRead 8 October 2026The exact support article separately names AAC and LDAC playback with ANC off/on. The current maker technical table matches all four rows at 50% volume. Nothing laboratory temperature is 25°C. The support footnote says AAC even beneath LDAC rows, so the explicitly labelled codec rows govern. Talk and standby durations are excluded. The copied product disclaimer erroneously states 50 hours with ANC off and is not used.

BSennheiser HDB 630

Connection	ANC	Hours (h)
Bluetooth	Yes	60

Source1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Up to 60 h music via Bluetooth with ANC, iPhone at mid volume, standard resolution. Exact FAQ separately claims up to 45 h using aptX Adaptive 24-bit/96 kHz with BTD 700. Codec-less table avoids duplicate indistinguishable rows.

Battery life (claimed, max)

100h=CalculatedFrom Claimed battery life

60h=CalculatedFrom Claimed battery life

Battery life with ANC (claimed)

50h=CalculatedFrom Claimed battery life

60h=CalculatedFrom Claimed battery life

Battery life without ANC (claimed)

100h=CalculatedFrom Claimed battery life

Not available

Charging port

USB-C10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original guide charging diagram identifies USB-C Charge In. Current exact support limits charging input to 5 W.

USB-C1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Full charge timeiPublished time to fully charge a depleted headset. In-use charging can take longer.

120min1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Charging table states Type-C wired charging to full in 120 minutes. The feature text says under two hours. The numeric table estimate is retained without using the copied case-related disclaimer.

120min1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Maker full-charge claim about two hours. Manual page 16 explicitly complete charge cycle. Ambient above 30 C can extend duration.

Quick charge timeiCharge duration in the maker’s quick-charge claim. Read together with Quick charge playback.

5min3Maker product pagesupport.nothing.tech/hc/en-us/articles/38910318874897-Does-CMF-Headphone-Pro-support-fast-chargingRead 8 October 2026The exact current support article states a five-minute charge. The maker technical table agrees.

10min1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

Quick charge playbackiPlayback gained from Quick charge time. Charger power, codec, volume and ANC conditions belong in the source note.

8h3Maker product pagesupport.nothing.tech/hc/en-us/articles/38910318874897-Does-CMF-Headphone-Pro-support-fast-chargingRead 8 October 2026Five minutes gives eight hours with ANC off or four hours with ANC on. The stored maximum is eight hours with ANC off, AAC, 50% volume, and 25°C laboratory temperature. Marketing prose and older announcements quote four or five hours without consistent ANC conditions and are excluded.

7h1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 202610-minute charge for up to seven hours playback, corroborated current manual page 16 and exact FAQ near-empty battery. Current maker comparison table says six hours, contradicted by those three more exact sources. ANC state and codec for quick charge unstated.

Use while charging

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 16 explicitly music/calls while charging, potentially extending recharge time.

Charging dock or stand

Not available

Not available

Controls

5 of 6 differ

Controls

Buttons, Volume wheel, Slider6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The original guide and current support describe Power/BT and shortcut buttons plus a pressable Roller that controls volume. A separate physical Energy Slider adjusts bass or treble after selecting its tuning mode in Nothing X.

Buttons, Touch3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Volume control

Wheel6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The exact volume article states rolling the knob up/down adjusts playback volume.

Touch3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Game and chat mixiBalances separate game and chat audio streams. Mixing Bluetooth and dongle source volume alone does not count. Supported platforms belong in the source note.

Not available

Not available

Remappable controlsiOn-device button, touch or dial functions can be reassigned. Changing EQ alone does not count.

Yes6Maker product pagesupport.nothing.tech/hc/en-us/sections/38910365859601-How-toRead 8 October 2026The support controls list provides optional button functions and bass/treble tuning for the Slider through Nothing X. Essential Space requires Nothing OS.

Not available

Wear detection

No15Reviewtomsguide.com/audio/headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact specification table and design discussion explicitly state no wear detection.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Pages 8 and 39 automatic lifting/on-head switch-on, pause/resume and call mute on removal.

Voice assistant

ChatGPT27Maker product pagesupport.nothing.tech/hc/en-us/articles/39520905948689-Why-can-t-I-use-ChatGPT-on-CMF-Headphone-ProRead 8 October 2026The exact CMF Headphone Pro support article documents a configurable button shortcut to ChatGPT Voice. Requires a compatible Nothing or CMF phone, current phone system and Nothing X app, an installed signed-in ChatGPT app, and prior use of ChatGPT Voice. This is phone-app integration, not an independent on-headphone assistant. Unnamed generic phone assistants are not converted into specific Siri or Google Assistant claims.

Siri, Google Assistant3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 38 host Siri or Google Assistant via multifunction button, Bluetooth or USB, conditional on device/app support. No always-listening assistant inferred.

Comfort and build

6 of 11 differ

Headband type

Padded13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact design discussion describes cushioning across the headband and ear pads.

Padded4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026

Headband material

PU synthetic leather and memory foam13Reviewtechradar.com/audio/wireless-headphones/cmf-by-nothing-headphone-pro-reviewRead 8 October 2026The exact design section describes polyurethane synthetic leather and memory foam across the headband and ear pads. Steel reinforcement is independently identified by maker support.

Japanese protein leatherette4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026Exact FAQ specifically Japanese leatherette headband, maker press names protein leatherette from IDEATEX. Does not identify frame/yoke material.7Press releasenewsroom.sennheiser.com/audiophile-sound-cut-loose-lyf8raRead 5 October 2026Exact maker launch explicitly Japanese protein leatherette headband from IDEATEX.

Frame material

ABS plastic shell, PA+GF sliding arms, stainless steel headband strips8Maker product pagesupport.nothing.tech/hc/en-us/articles/38910349693841-What-material-is-the-outer-casing-of-CMF-Headphone-Pro-made-ofRead 8 October 2026The exact material article identifies ABS shell, PA+GF sliding arms, and stainless steel headband strips. The SoundGuys all-plastic description does not override these published internal reinforcement materials.

Not available

Ear cup material

Not available

Not available

Ear pad material

PU leather with high-resilience memory foam9Maker product pagesupport.nothing.tech/hc/en-us/articles/38910322756881-What-material-are-the-ear-cushions-of-CMF-Headphone-Pro-made-ofRead 8 October 2026The exact cushion material article specifies polyurethane synthetic leather covering and high-resilience memory foam fill.

Leatherette (synthetic)2Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Exact current product ear-pad material field explicitly synthetic leatherette, separate from headband lining.

Replaceable ear pads

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker states that cushions twist on and off for cleaning and replacement. Optional colored cushions are sold separately.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Ear pad attachmentiHow a replacement ear pad attaches to the ear cup, not how the decorative outer cover attaches. A press-fit or snap-on pad counts as clip.

Twist lock1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker describes twisting cushions on and off. Exact SoundGuys review confirms the rotating attachment. This is a twist-lock attachment rather than a clip or magnetic mount.

Clip3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 44 fastening ring pulls off and replacements click audibly into place around earcup, clip fit.

Ear pad openingiUsable opening inside an ear pad, excluding the outer cushion. Depth is the internal space between pad surface and driver cover.

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Ear tips included

Not available

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Dust and water rating

IPX220Maker product pagesupport.nothing.tech/hc/en-us/sections/38910294951441-Product-FeatureRead 8 October 2026The exact Water/dust resistance support article states IPX2 under IEC 60529. There is no certified dust protection. The TechRadar no-IP-rating claim is contradicted by the maker and is not used.

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User-replaceable parts

Ear cushions1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker explicitly permits swapping and cleaning the ear cushions. The original manual prohibits user battery replacement.

Ear pads, Analog audio cable3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 44 ear-pad replacement. Exact FAQ also offers aux cable as spare. Sealed battery is not user exchangeable.

Software

1 of 3 differ

Companion app

Nothing X1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The Nothing X app section names Nothing X.

Sennheiser Smart Control Plus1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

App platforms

Android, iOS1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker app section expressly says Android and iOS. Individual features have phone, OS, and app requirements.

Android, iOS1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026

User firmware updates

Yes1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker app section documents firmware update management.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Dimensions and weight

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Headset weightiPublished headset mass without detachable cable or microphone when stated. A fixed cable remains included. Any unqualified maker weight is identified in the source note.

283g(10 oz)1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The labelled Headphones weight table states 283 g. This is the maker claim. Cushion weight is a separate 45 g entry with unspecified quantity scope and is not added to headset mass.

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Headset dimensionsiBody size with headband upright and ear cups in their normal wearing position. Width is across the head, height is top to bottom, and depth is front to back. Folded or flat-swivel dimensions are not substituted.

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Width180Height195Depth51mm(7.1 × 7.7 × 2 in)1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026180 x 195 x 51 mm explicitly folded flat. No packaging, case or unfolded reviewer dimensions substituted.

Certifications

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Hi-Res Audio

Hi-Res Audio, Hi-Res Audio Wireless1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The maker expressly claims wired and wireless Hi-Res certifications. Wireless high-resolution playback requires a compatible LDAC source.

Hi-Res Audio4Maker product pageus.sennheiser-hearing.com/pages/hdb-630-faqRead 5 October 2026Exact FAQ transducer answer explicitly Hi-Res Audio certification. Wireless Hi-Res logo certification not expressly identified and omitted.

Communication certifications

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FCC ID

2AZEQ-B17510Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original regulatory document identifies exact FCC ID 2AZEQ-B175. Radio transmit power is not treated as audio amplifier power.

Not available

Other certifications

EU RED 2014/53/EU, EU RoHS 2011/65/EU and 2015/86326Maker spec sheet (PDF)s3.zoommer.ge/site/certificate/nothing-cmf-headphone-pro.pdfRead 8 October 2026English declaration page 2 lists RED 2014/53/EU and RoHS 2011/65/EU and 2015/863. These are maker declarations for B175, not inferred Bluetooth SIG or extra market-availability claims.

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In the box

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In the box

CMF Headphone Pro, Carry pouch, User guide, Safety and warranty information, 3.5 mm to 3.5 mm audio cable (1.2 m)1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact In the box table lists the headset, pouch, guide, safety/warranty information, and one 1.2 m analog cable. No USB charging cable or wall charger is listed. Exact TechRadar review independently confirms both omissions.

Sennheiser HDB 630 headphones, BTD 700 USB-C Bluetooth dongle, USB-C to USB-C cable, 3.5 mm to 2.5 mm analog audio cable, In-flight adapter, Carry case, Quick guide, Safety guide, Compliance sheet3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 5 full exact bundle includes BTD 700, both 1.2 m cables, in-flight adapter, case and three documents. Older sheet omits dongle from box list, newer exact manual/current product agree it is included.

Cables includediSupplied playback, charging, dongle and adapter cables. A permanently attached headset cable is included and named as fixed.

ACMF Headphone Pro

Type	Length (m)	Count
3.5 mm to 3.5 mm audio cable	1.2	1

Source1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact package table lists one 3.5 mm to 3.5 mm audio cable, 1.2 m long. No charging cable is supplied. Contact arrangement is not inferred from nominal plug size.

BSennheiser HDB 630

Type	Length (m)	Count
USB-C to USB-C audio and charging cable	1.2	1
3.5 mm to 2.5 mm stereo audio cable	1.2	1

Source3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026

Carrying caseiSupplied carrying case or pouch. A retail carton does not count as a carrying case.

Soft22Reviewsoundguys.com/cmf-headphone-pro-review-a-solid-b-side-146595Read 8 October 2026The maker box table supplies a Carry Pouch. Exact SoundGuys and TechRadar reviews explicitly describe a cloth/fabric travel bag. This is a soft pouch, not a hard case.

Hard5Reviewsoundguys.com/sennheiser-hdb-630-review-audiophile-anc-at-a-cost-146569Read 5 October 2026Exact review explicitly fabric-covered hardshell case. Maker packaging Hard box not substituted for carry case.

Links

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Product page

us.nothing.tech/products/cmf-headphone-pro1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The exact US Dark Grey selector and public variant payload identify this reference. No Headphone (1) or Headphone (a) values are transferred.

us.sennheiser-hearing.com/products/hdb-6302Maker product pageus.sennheiser-hearing.com/products/hdb-630Read 5 October 2026Full current maker product HTML and public /products/hdb-630.js directly opened. Current model specification and exact initial product swatches are separated from comparison products.

Spec sheet

us.nothing.tech/products/cmf-headphone-pro1Maker product pageus.nothing.tech/products/cmf-headphone-proRead 8 October 2026The public page payload contains labelled technical specification tables. No separate exact maker datasheet was found. These tables were read from the normally downloaded page HTML.

cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdf1Maker spec sheet (PDF)cdn.uc.assets.prezly.com/366a6e36-55f2-48e2-a1a2-9a22870de4a1/-/inline/no/Senn_HDB%2520630_Spec_Sheet_EN.pdfRead 5 October 2026Full three-page maker spec sheet dated 08/25 directly opened and technical/battery tables visually checked. Original article 700445 / EAN 4260752333450 / UPC 810091273548 is documented. Current maker storefront replaces commercial SKUs without a new model name. Only current exact SKU/UPC pairs are listed below. Device weight 311 g conflicts with newer 12/25 manual page 48 at 293 g. No maker correction establishes either figure, so weight is omitted.

Manual

fccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdf10Owner's manualfccid.io/2AZEQ-B175/User-Manual/Users-Manual-8638814.pdfRead 8 October 2026The original 44-page manufacturer FCC exhibit combines safety/warranty information with the multilingual Quick Start Guide. Cover explicitly identifies model B175. This is not a generated third-party manual.

cdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdf3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Full 51-page official English manual, version 12/25 A02, directly opened. Headphone and included Bluetooth adapter sections reviewed separately.

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

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Warranty

1 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

1year19Maker product pageus.nothing.tech/pages/terms-of-salesRead 8 October 2026Current US Terms of Sale section 6.8 gives headphones twelve months of limited warranty. This covers the original US maker-store purchase. Statutory rights and other regions are separate.

2years3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/hdb-630/Instruction%20manual%20HDB%20630/Instruction_manual_HDB_630.pdfRead 5 October 2026Page 50 HDB 630 warranty 24 months in named North America, Latin America/Caribbean, Asia-Pacific, Europe and Middle East. Included BTD 700 separately 12 months in first region group, 24 months Europe/Middle East. Headphone field reflects HDB 630, not accessory warranty.

Both are also in the API. Back to all headsets and headphones.