Headsets and headphones / Compare

Sennheiser HD 550 vs Sonos Ace

A

Product A: Sennheiser

HD 550

51 of 161 known

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B

Product B: Sonos

Ace

67 of 161 known

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All 161 fields

Every value links to where we found it.

Only differences

ASennheiser HD 550

BSonos Ace

General

5 of 8 differ

Series

HD 5001Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 2 identifies HD 500 series.

Not available

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

HD 550, 7004551Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

ACEG1US1BLK, ACEG1US11Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Page data lists SKU ACEG1US1BLK for Black and ACEG1US1 for Soft White. These are US SKUs.

GTIN / EAN

4260752333498, 8100912735861Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3 Technical Data. Maker V02 EN, February 17 2025, mirrored by Geizhals.

Not available

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

19 March 20252Press releasecdn.uc.assets.prezly.com/125ff0a6-9592-4c48-be8d-28f7b3273ca5/-/inline/no/Press_Release_Sennheiser_HD_550_EN.pdfRead 23 October 2026

21 May 20247Press articletomsguide.com/audio/headphones/sonos-officially-unveils-its-first-wireless-headphones-heres-everything-you-need-to-know-about-the-sonos-aceRead 11 October 2026Sonos Ace announced May 21, 2024.

Status

Available3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026

Available1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Sold on the maker US store, currently at $239 against a $349 list price.

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.

$299.952Press releasecdn.uc.assets.prezly.com/125ff0a6-9592-4c48-be8d-28f7b3273ca5/-/inline/no/Press_Release_Sennheiser_HD_550_EN.pdfRead 23 October 2026Page 3 launch MSRP $299.95 USD before tax.

$4497Press articletomsguide.com/audio/headphones/sonos-officially-unveils-its-first-wireless-headphones-heres-everything-you-need-to-know-about-the-sonos-aceRead 11 October 2026Expected prices at the announcement: USD $449 / GBP 449 / EUR 499 / AUD $699. TechCrunch and What Hi-Fi? also give $449.

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.

€299.92Press releasecdn.uc.assets.prezly.com/125ff0a6-9592-4c48-be8d-28f7b3273ca5/-/inline/no/Press_Release_Sennheiser_HD_550_EN.pdfRead 23 October 2026Page 3 launch MSRP EUR 299.90, including VAT as published.

€4997Press articletomsguide.com/audio/headphones/sonos-officially-unveils-its-first-wireless-headphones-heres-everything-you-need-to-know-about-the-sonos-aceRead 11 October 2026Expected EUR 499 at the announcement. Digital Trends gives EUR 499 as the 2024 launch price. Tax treatment is not stated.8Press articledigitaltrends.com/home-theater/sonos-ace-ultra-may-launch-cheaper-than-the-original-ace-new-leak-revealsRead 11 October 2026The Ace launched in 2024 at EUR 499.

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

Not available

Not available

ColoursiThe maker's own colour names

Black7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026Design describes black finish.

Black, Soft White1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Colors: Black, Soft White. Finish: Matte.

Segment

Music3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Maker categorizes these as audiophile headphones for critical music listening.

Music1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Maker markets it as noise-canceling headphones for music, spatial audio and TV listening.

Design

2 of 7 differ

Form factor

Over-ear4Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3 technical specifications: wired headband, over-ear circumaural, open-back.

Over-ear1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Over-ear headphones. The page and What Hi-Fi? call them over-ear.

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

Open4Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Closed4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026The TrueCinema section says the aim is not to feel like you are wearing closed-back headphones, which describes the Ace as closed-back. HeadphoneCheck lists the type as closed.5Reviewheadphonecheck.com/test/sonos-aceRead 11 October 2026Technical specifications: Type closed, ear coupling over-ear, transducer principle dynamic.

Wearing style

Headband4Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Headband2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Extendable stainless steel headband with rotating ear cups.

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

None11Measurementdiyaudioheaven.wordpress.com/measurements/brands-s-se/hd550Read 23 October 2026Specifications explicitly says collapsible No.

Flat4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026The ear cups swivel flat but do not fold up. Shotkit also says they do not fold.

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

Yes11Measurementdiyaudioheaven.wordpress.com/measurements/brands-s-se/hd550Read 23 October 2026Build description distinguishes sideways swivel from limited vertical tilt.

Yes2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026The extendable stainless steel headband and rotating ear cups adjust for a bespoke fit.4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026The ear cups swivel flat.

RGB lighting

Not available

Not available

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

Not available

Not available

Drivers and sound

11 of 20 differ

Driver type

Dynamic5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Dynamic1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Custom-designed 40 mm dynamic driver in each cup.

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

38mm6Press releasecdn.uc.assets.prezly.com/125ff0a6-9592-4c48-be8d-28f7b3273ca5/-/inline/no/Press_Release_Sennheiser_HD_550_EN.pdfRead 23 October 2026Page 1 custom 38 mm transducer.

40mm1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Custom-designed 40 mm dynamic driver in each cup.

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

Not available

11Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Custom-designed 40 mm dynamic driver in each cup.

Diaphragm material

Laminate plastic foil7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026Design and features quotes maker on diaphragm construction.

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.

Min6 HzMax39.5 kHz5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Not available

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.

150Ω5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Not available

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.

106.7dB5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3: 106.7 dB SPL at 1 kHz / 1 Vrms.

Not available

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

Per 1 V5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Not available

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

0.2%5Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3: less than 0.2% at 1 kHz / 90 dB SPL. Stored upper bound.

Not available

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

48kHz4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026Connected to a laptop over USB-C, the headphones support sample rates of 16-bit/48kHz.

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

Not available

16bits4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026Connected to a laptop over USB-C, the headphones support sample rates of 16-bit/48kHz.

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.

Not available

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.

No12Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Maker explicitly describes a direct analog signal path with no electronics. No powered noise cancellation, digital USB audio or stored electronic equalizer.

Not available

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

Not available

Not available

EQ presets

Not available

Not available

Volume limit

Not available

Not available

Spatial audio

2 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.

Not available

Dolby Atmos1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Dolby Atmos requires a supported Sonos soundbar and the Sonos app for TV Audio Swap. Spatial audio from supported services and devices works over Bluetooth.

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

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Sonos Intelligent Motion Processing with Dolby Head Tracking. Enable it in the Sonos app. The Sonos Ace must be registered in the app.

Noise cancelling

4 of 10 differ

Active noise cancelling

No12Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Maker explicitly describes a direct analog signal path with no electronics. No powered noise cancellation, digital USB audio or stored electronic equalizer.

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Active Noise Cancellation dynamically adapts to fit, blocking external sounds. Aware mode blends ambient sound with the content.

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

Not available

Not available

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

Not available

Not available

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

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Active Noise Cancellation dynamically adapts to fit and surroundings.

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

Not available

Not available

ANC attenuation (claimed)

Not available

Not available

Transparency mode

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Aware mode blends ambient sound with your content.

Adjustable transparency

Not available

Not available

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

Not available

Not available

Wind noise reduction

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Specially engineered mesh over the microphones minimizes noise from wind on phone calls.

Measured

2 of 21 differ

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

Bass rolls off gently below 25 Hz. The response stays within 3 dB from 25 Hz to 2 kHz. Treble has a peak near 13 kHz.11Measurementdiyaudioheaven.wordpress.com/measurements/brands-s-se/hd550Read 23 October 2026Flatbed rig with good seal, no smoothing. Reviewer applies microphone and low-frequency correction. Measurements published July 11 2025. Actual fit can differ.

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

Not available

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.

Not available

Not available

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

Not available

Not available

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.

238g(8.4 oz)11Measurementdiyaudioheaven.wordpress.com/measurements/brands-s-se/hd550Read 23 October 2026Measured specimen 238 g excluding cable. Maker claim stays 237 g.

313g(11 oz)5Reviewheadphonecheck.com/test/sonos-aceRead 11 October 2026Weighed by HeadphoneCheck: 313 g without cable and 329 g with cable.

Microphone

4 of 16 differ

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

None7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026Base headphone has no microphone. Optional boom arm is excluded.

Built-in2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Eight microphones in the ear cups for noise control and voice targeting. No boom microphone.

Microphone element

Not available

Not available

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

Not available

Not available

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

Not available

Not available

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.

Not available

81Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Eight microphones for noise control and voice targeting. The maker states the total for the headset.

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

Not available

Not available

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

DSP1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Beamforming microphones target your voice and suppress background noise on calls. Stored as DSP processing. The maker does not claim AI processing.

Flip to mute

Not available

Not available

Mute button

Not available

Not available

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

Not available

Sidetone

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Sidetone helps you hear your own voice when Active Noise Cancellation is enabled.2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Sidetone is a setting in the Sonos app Noise Control section. It may not work when the headphones are plugged into another device during a call.

Adjustable sidetone

Not available

Not available

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

Not available

Not available

Connectivity

12 of 20 differ

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

Analog8Reviewsoundguys.com/sennheiser-hd-550-review-134419Read 23 October 2026

Bluetooth, USB, Analog2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Bluetooth. The USB-C port also takes line-in audio over a USB-C to 3.5 mm cable (for analog sources) or a USB-C to USB-C cable. Bluetooth is disabled while a USB-C cable is connected.

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

3.5 mm TRS, 6.35 mm8Reviewsoundguys.com/sennheiser-hd-550-review-134419Read 23 October 2026

Not available

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

2.5 mm8Reviewsoundguys.com/sennheiser-hd-550-review-134419Read 23 October 2026Connectivity section explicitly identifies 2.5 mm locking headset end and 3.5 mm TRS source end.

USB-C2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Both included cables plug into the headset USB-C port. The 3.5 mm cable is not compatible with third party cables.

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

1.8m9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

1.2m1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Longest included cable is the USB-C to 3.5 mm cable, 3.94 ft (1.2 m).

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.

Not available

USB-C2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026USB-C port for charging and line-in.

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.

No12Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Maker explicitly describes a direct analog signal path with no electronics. No powered noise cancellation, digital USB audio or stored electronic equalizer.

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Lossless audio over Bluetooth with a supported device or via a USB-C connection. The page also says to use the USB-C cable for wired listening.

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.

Yes3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Direct analog signal path with no electronics and no charging or pairing.

No5Reviewheadphonecheck.com/test/sonos-aceRead 11 October 2026The USB-C to 3.5 mm cable still needs the headphones switched on. MusicTech says they do not work in passive mode over 3.5 mm.6Reviewmusictech.com/reviews/consumer/sonos-ace-reviewRead 11 October 2026They do not work in passive mode over 3.5 mm. They always have to be on and charged.

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

Not available

None2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Bluetooth headphones. No dongle in the box.

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

Not available

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.

Not available

Not available

Bluetooth

Not available

5.41Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Bluetooth 5.4

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

Not available

SBC, AAC, aptX HD, aptX Adaptive, aptX Adaptive Low Latency, aptX Lossless3Maker product pagesupport.sonos.com/en/article/supported-bluetooth-audio-formats-for-sonos-aceRead 11 October 2026Maker article lists SBC, AAC, aptX Lossless, aptX Adaptive, aptX Adaptive Low Latency and aptX HD. The page text says Sonos headphones. The article URL names the Sonos Ace. Lossless over Bluetooth needs an Android device with Qualcomm Snapdragon Sound aptX for Lossless. What Hi-Fi? and HeadphoneCheck list only SBC, AAC and aptX Lossless.4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026Tech specs list SBC, AAC and aptX Lossless. The maker support article lists more aptX variants and is stored.

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.

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Sonos Ace must be registered in the Sonos app to enable Bluetooth multipoint.

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

Not available

22Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026You can connect Sonos Ace to 2 Bluetooth devices and automatically switch between audio streams. Multipoint is off by default.

Paired devices remembered

Not available

Not available

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

Not available

Not available

Base station

Not available

Not available

Latency

None of 2 known

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

Not available

Not available

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

Not available

Not available

Compatibility

1 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.

PS5, PS4, Xbox Series X|S, Xbox One, Nintendo Switch7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026Comparison table explicitly lists these platforms. PC stored as Windows, corroborated by wired PC review. Mobile lacks named OS and is omitted.

Android, iOS1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Page says Works with Apple and Android.

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.

Not available

Not available

Official licence

Not available

Not available

Battery and charging

8 of 13 differ

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

Not available

1,060mAh1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Li-ion, 1060 mAh battery

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

Not available

Not available

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

Not available

Not available

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.

ASennheiser HD 550

Not available

BSonos Ace

Connection	ANC	Hours (h)
Bluetooth	Yes	30

Source1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Up to 30 hours of listening time or 24 hours of call time with Active Noise Cancellation or Aware mode enabled. Stored as the 30 hour listening claim. The 24 hour call time is not stored. The page says battery life varies by use and settings.

Battery life (claimed, max)

Not available

30h=CalculatedFrom Claimed battery life

Battery life with ANC (claimed)

Not available

30h=CalculatedFrom Claimed battery life

Battery life without ANC (claimed)

Not available

Not available

Charging port

Not available

USB-C1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Charge with the included USB-C cable and a compatible power adapter.

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

Not available

180min1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Complete charge from 0% requires up to 3 hours. Stored as 180 minutes, the upper bound.

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

Not available

3min1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Rapid charge provides 3 hours of listening time in 3 minutes from 0%.

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

Not available

3h1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Rapid charge provides 3 hours of listening time in 3 minutes from 0%.

Use while charging

Not available

Not available

Charging dock or stand

Not available

Not available

Controls

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Controls

Not available

Buttons, Slider2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Content Key slides for volume and presses for playback, plus a Noise Control button and a Power/Bluetooth button. What Hi-Fi? calls the Content Key a slider and button.4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026Physical (not touch) controls. A multi-functional slider and button called the content key.

Volume control

None7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026No onboard controls or volume dial.

Not available

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.

Not available

Not available

Wear detection

Not available

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Feature list: Wear detection.2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Wear detection is enabled by default and can be turned off in the Sonos app.

Voice assistant

Not available

Voice assistant of the connected device2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Press and hold the Noise Control / Voice Control button to activate the voice assistant on the connected device.

Comfort and build

7 of 11 differ

Headband type

Padded7Reviewtechradar.com/gaming/sennheiser-hd-550-reviewRead 23 October 2026

Padded5Reviewheadphonecheck.com/test/sonos-aceRead 11 October 2026The headband is well padded on the underside and trimmed with artificial leather.

Headband material

Synthetic leather3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026

Not available

Frame material

Plastic8Reviewsoundguys.com/sennheiser-hd-550-review-134419Read 23 October 2026Design describes plastic exterior and chassis.

Stainless steel2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026The stainless steel headband smoothly extends and stays securely in place.

Ear cup material

Steel mesh covers3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026Maker names steel covers. Entire cup construction is not claimed to be steel.

Not available

Ear pad material

Synthetic velour9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Memory foam covered in vegan leather4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026The ear pads use memory foam coated in a layer of vegan leather (polyurethane).

Replaceable ear pads

Yes9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Yes1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Replaceable ear cushions help extend the life of the headphones.2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Ear cushion replacement section.

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.

Not available

Magnetic2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Each cushion is held in place by magnets and comes off with a light pull. It snaps into place when reattached.4Reviewwhathifi.com/reviews/sonos-aceRead 11 October 2026The replaceable ear pads are attached to the frame by strong magnets.

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

Width42Height71mm(1.7 × 2.8 in)11Measurementdiyaudioheaven.wordpress.com/measurements/brands-s-se/hd550Read 23 October 2026Specifications explicitly names inner pad width 42 mm and height 71 mm. Front/rear depth differs, so a single depth is omitted. SoundGuys labels 43 x 75 mm as ear cup dimensions without saying usable opening.

Not available

Ear tips included

Not available

Not available

Dust and water rating

Not available

Not available

User-replaceable parts

Ear pads, Audio cable9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3 lists replacement cable and ear pads.

Ear cushions2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Ear cushions can be easily replaced if they wear out.

Software

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Companion app

Not available

Sonos2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Use the Sonos app to adjust product settings.

App platforms

Not available

Android, iOS2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Sonos app (iOS and Android).

User firmware updates

Not available

Yes2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Sonos app About screen: check for software updates and see the current software version.

Dimensions and weight

2 of 2 differ

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.

237g(8.4 oz)9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3 explicitly excludes cable.

312g(11 oz)1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Weight 0.69 lbs (0.312 kg)

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.

Not available

Width160Height191Depth85mm(6.3 × 7.5 × 3.3 in)1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Height 7.52 in (191 mm), Width 6.3 in (160 mm), Depth 3.35 in (85 mm)

Certifications

None of 3 known

Hi-Res Audio

Not available

Not available

Communication certifications

Not available

Not available

FCC ID

Not available

Not available

Other certifications

Not available

Not available

In the box

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In the box

HD 550 headphones, 1.80 m cable with 3.5 mm jack plug, 3.5 to 6.35 mm screw-on jack adapter, Drawstring bag, Safety guide9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026Page 3 complete box contents.

Sonos Ace headphones, USB-C to USB-C cable, USB-C to 3.5 mm cable, Travel case with removable cable pouch, Set up guide and legal and warranty information1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026Box contents: Sonos Ace, USB-C to USB-C cable, USB-C to 3.5 mm cable, travel case that includes a removable cable pouch, set up guide and legal and warranty information.

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

ASennheiser HD 550

Type	Length (m)	Count
2.5 mm locking headset plug to 3.5 mm stereo plug	1.8	1

Source9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

BSonos Ace

Type	Length (m)	Count
USB-C to USB-C cable	0.75	1
USB-C to 3.5 mm cable	1.2	1

Source1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026USB-C to USB-C cable 2.46 ft (0.75 m). USB-C to 3.5 mm cable 3.94 ft (1.2 m).

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

Soft9Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Hard5Reviewheadphonecheck.com/test/sonos-aceRead 11 October 2026The Ace arrives in a felt-covered hard case made of recycled plastic with a zip. Shotkit calls it semi-hard.

Links

Not compared

Product page

us.sennheiser-hearing.com/products/hd-5503Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026

www.sonos.com/en-us/shop/sonos-ace1Maker product pagesonos.com/en-us/shop/sonos-aceRead 11 October 2026

Spec sheet

gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdf1Maker spec sheet (PDF)gzhls.at/blob/ldb/2/9/c/b/88e1c5f7d6f57d4eddbdef407b2427546a53.pdfRead 23 October 2026

Not available

Manual

www.richersounds.com/content/product_files/HD550.pdf10Owner's manualrichersounds.com/content/product_files/HD550.pdfRead 23 October 2026Maker safety guide HD 505 / HD 550 with connection, headband adjustment and ear pad replacement illustrations. Retailer mirror because current maker Download article is empty.

www.sonos.com/en-us/guides/sonosace2Owner's manualsonos.com/en-us/guides/sonosaceRead 11 October 2026Sonos Ace product guide.

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.

Not available

Not available

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.

2years3Maker product pageus.sennheiser-hearing.com/products/hd-550Read 23 October 2026US maker page includes a 2-year manufacturer warranty.

Not available

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