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Marshall Monitor III A.N.C. vs Sennheiser ACCENTUM Plus Wireless

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Product A: Marshall

Monitor III A.N.C.

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B

Product B: Sennheiser

ACCENTUM Plus Wireless

87 of 161 known

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Every value links to where we found it.

Only differences

AMarshall Monitor III A.N.C.

BSennheiser ACCENTUM Plus Wireless

General

6 of 8 differ

Series

Monitor1Press releasegroup.marshall.com/2024/09/25/marshall-and-billie-joe-armstrong-join-forces-to-unveil-feature-packed-monitor-iii-a-n-c-headphonesRead 23 October 2026

ACCENTUM1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

MONITIII, 1006861, 1009077, 10091633Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Public maker page product data lists orderable US Black 1006861, Cream 1009077 and Pitch Black 1009163. Regulatory MONITIII comes from FCC filing.

ACPAEBT, 700176, 7001771Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Manual regulatory ACPAEBT plus exact Black SKU 700176 and White SKU 700177 in maker sheet. Current public shop SKU rows match.2Maker product pagesupport.sennheiser-hearing.com/hc/en-gb/articles/37817890197021-ACCENTUM-Plus-Wireless-SpecificationsRead 5 October 2026Current exact table Black 700176 and White 700177.

GTIN / EAN

7340055401777, 73400554114794Retailer pageargos.co.uk/product/3347382/GM-VariantRead 23 October 2026Exact UK Black model 1006861 EAN. Other Argos hardware specs contain errors and are not substituted for maker data.42Retailer pagebhphotovideo.com/c/product/1958585-REG/marshall_1009077_monitor_iii_a_n_c_wireless.html/overviewRead 23 October 2026Exact Cream SKU 1009077 EAN 7340055411479.

4260752330596, 810091270592, 4260752330619, 8100912706151Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Sheet directly maps Black EAN 4260752330596 / UPC 810091270592, White EAN 4260752330619 / UPC 810091270615. Current maker shop UPC rows match.

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

24 September 20242Press articlenotebookcheck.com/Marshall-stellt-neue-kabellose-ANC-Kopfhoerer-Monitor-III-A-N-C-vor.890514.0.htmlRead 23 October 2026Contemporaneous September 24, 2024 German launch report says announced today. Maker corporate post is dated September 25, one day after stated retail availability.

8 January 20247Press releasecdn.uc.assets.prezly.com/766165b6-91b2-4e80-8678-9a65abaa2fec/-/inline/no/Sennheiser%20CES%202024%20press%20release%20FINAL_EN.pdfRead 5 October 2026Full four-page maker CES announcement dated January 8, 2024 explicitly names new ACCENTUM Plus. February 20 availability is future wording in this announcement, independently verified as actual retail below.

Status

Available1Press releasegroup.marshall.com/2024/09/25/marshall-and-billie-joe-armstrong-join-forces-to-unveil-feature-packed-monitor-iii-a-n-c-headphonesRead 23 October 2026Launch from September 24, 2024. Current maker page still lists orderable colors.

Available4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026Both exact Black 700176 and White 700177 current public maker variants available true. Current selling prices are not launch prices.

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.

Not available

$229.956Press releasecdn.uc.assets.prezly.com/df2c1fe4-a324-494e-87f6-f50b157cf1b0/-/inline/no/Sennheiser%20ACCENTUM%20Plus_AVAILABILITY_FINAL_EN.pdfRead 5 October 2026Full four-page maker US retail-launch release February 20, 2024 states MSRP 229.95 USD. Before local sales tax. Canadian amount and EUR without proven VAT scope not stored. Current SoundGuys commerce widget MSRP 249.95 is not original launch amount.

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.

€3492Press articlenotebookcheck.com/Marshall-stellt-neue-kabellose-ANC-Kopfhoerer-Monitor-III-A-N-C-vor.890514.0.htmlRead 23 October 2026Contemporaneous German launch report names 349 EUR at Marshall and retailers. Consumer price including VAT as published. The Black launch finish is covered. Later Cream and Pitch Black launch prices are not established.

Not available

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

US, GB, DE3Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026US maker store. UK Black GTIN from Argos and German launch availability from Notebookcheck. Not a global list.

US6Press releasecdn.uc.assets.prezly.com/df2c1fe4-a324-494e-87f6-f50b157cf1b0/-/inline/no/Sennheiser%20ACCENTUM%20Plus_AVAILABILITY_FINAL_EN.pdfRead 5 October 2026

ColoursiThe maker's own colour names

Black, Cream, Pitch Black3Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current exact-model maker colorways. Hardware is presented as one marketed model.

Black, White1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

Segment

Music1Press releasegroup.marshall.com/2024/09/25/marshall-and-billie-joe-armstrong-join-forces-to-unveil-feature-packed-monitor-iii-a-n-c-headphonesRead 23 October 2026Maker describes music listening headphones in Monitor line.

Music6Press releasecdn.uc.assets.prezly.com/df2c1fe4-a324-494e-87f6-f50b157cf1b0/-/inline/no/Sennheiser%20ACCENTUM%20Plus_AVAILABILITY_FINAL_EN.pdfRead 5 October 2026Maker release describes music listening and consumer travel use.

Design

1 of 7 differ

Form factor

Over-ear5Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Manual cover over-ear headphones.

Over-ear1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

Closed6Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026Exact-model FAQ explicitly closed-back headphones.

Closed3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

Wearing style

Headband5Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026

Headband1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

Flat and inward5Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 6 hard-case instructions rotate left/right cups and fold inward until pads meet.

Flat4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026Maker explicitly fold-flat design and freely swiveling hinges. Manual page 29 case diagram and launch release agree. No inward folding asserted.

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

Yes5Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 6 explicitly rotates left counterclockwise and right clockwise.

Yes4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026

RGB lighting

Not available

Not available

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

Not available

Not available

Drivers and sound

7 of 20 differ

Driver type

Dynamic7Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

Dynamic1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

32mm7Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

37mm1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

Not available

Not available

Diaphragm material

Not available

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 kHz7Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current single frequency range 20-20,000 Hz. Mode and test tolerance unspecified. Not a wireless passband.

Min10 HzMax22 kHz1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Manual page 34 gives the same 10 Hz-22 kHz acoustic range at -10 dB. No wireless transport bandwidth is inferred.

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.

46Ω7Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker audio specification 46 ohm. Earlier secondary reviews give 35 ohm. Current maker wins. No passive power-off impedance claimed.

95Ω1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Passive impedance 95 ohms. Powered active impedance 560 ohms is separately stated and not substituted.

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.

91dB7Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker 91 dB SPL at -18 dBFS, 1 kHz. This is not per 1 mW or per 1 V, so sensitivity_reference omitted. Earlier reviewers quote different sensitivity references.

106dB1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Maker SPL 106 dB at 1 kHz / 0 dBFS. Not a per-1-mW or per-1-V sensitivity, so sensitivity_reference omitted.

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

0.3%1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Advertised upper bound strictly below 0.3 percent at 1 kHz / 100 dB SPL. Stored 0.3 is the published ceiling, not a measured value.

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

Not available

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

Not available

Not available

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.

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 26 explicitly sound effects are stored in headphones and remain active without Smart Control app on a different Bluetooth source.

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

58Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026App section five-band custom playback EQ. HeadphoneCheck corroborates. Five presets are stated but a complete exact name list is not published.

51Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

EQ presets

Bass Boost9Reviewtechradar.com/audio/wireless-headphones/marshall-monitor-iii-anc-reviewRead 23 October 2026Review explicitly names bass boost. Full factory-name list was not independently verified, so only the named option is stored.

Bass Boost, Podcast1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Maker sheet explicitly Bass Boost and Podcast sound modes. Both are independently demonstrated as EQ presets in SoundGuys review. Other preset names not stated are not guessed.

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.

Soundstage10Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker named Soundstage spatial processing of stereo content into a virtual room. Head tracking not established.

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

2 of 10 differ

Active noise cancelling

Yes11Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker active noise cancellation. No topology or total physical microphone count specified.

Yes1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

Not available

Hybrid1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 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.

415Reviewnotebookcheck.com/Exklusiv-zum-Markstart-Marshall-Monitor-III-A-N-C-im-Praxis-Test-Tolles-Design-wie-ist-der-Klang.890386.0.htmlRead 23 October 2026Equipment section explicitly four microphones continuously record surrounding noise for ANC, increased from two. It does not establish speech microphone count or physical total.

43Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 7 expressly two ANC microphones directed outward and two inward. Four physical ANC microphones, not four voice microphones.

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

Yes14Reviewheadphonecheck.com/test/marshall-monitor-iii-a-n-cRead 23 October 2026ANC section explicitly describes adaptive noise cancelling. Maker does not name a specific adaptive ANC mode. Adaptive Loudness remains a separate sound feature.

Yes1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

314Reviewheadphonecheck.com/test/marshall-monitor-iii-a-n-cRead 23 October 2026Controls section explicitly three intensity levels for ANC, separately from three transparency levels. Off is excluded.

Not available

ANC attenuation (claimed)

Not available

Not available

Transparency mode

Yes11Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

Yes1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

Adjustable transparency

Yes11Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Common question Soundstage sliders are not used here. Exact noise-control support guide and SoundGuys explicitly adjustable transparency.13Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026Noise cancelling section explicitly three adjustable transparency levels.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 21 transparency and ANC intensity remain incrementally adjustable in app. Numerical level count not stated.

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

Not available

Not available

Wind noise reduction

Yes11Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker corporate launch explicitly microphones designed to reduce wind noise for ANC and calls. A claim, not a measured attenuation value.12Press releasegroup.marshall.com/2024/09/25/marshall-and-billie-joe-armstrong-join-forces-to-unveil-feature-packed-monitor-iii-a-n-c-headphonesRead 23 October 2026Launch text explicitly reduction of wind noise for ANC and calls.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 22 exact selectable Off, Auto and Max wind-reduction modes. These are not ANC level counts.

Measured

5 of 21 differ

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

The measured default response has more bass and treble and less midrange than the SoundGuys Preference Curve. ANC off adds some bass.17Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026Objective Measurements section. Default profile, nominal level, ANC-on comparison with ANC-off. Firmware and exact codec not published. No chart points converted into numeric dB fields.

The measured response follows the reviewer preference curve closely in bass and mids, with a narrow emphasis near 5-6 kHz.5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Same exact unit and firmware, Objective Measurements text. No plotted numeric points, target curve deviation or review scores converted to dB.

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

The recorded samples reject background noise well but lose vocal clarity. Loud speech can clip. Wind, street, office and reverberant conditions were tested.17Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026Recorded speech samples in simulated office, street, wind and reverberant conditions. Test codec, firmware and capture route are unpublished. The vote count is not a measurement.

The standardized call samples show wind-rejection problems. The reviewer finds the microphones adequate for indoor office calls.5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Same unit and firmware, standardized ideal, office, street, windy and reverberant samples. No numerical microphone bandwidth inferred from audio.

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.

AMarshall Monitor III A.N.C.

Connection	ANC	Hours (h)
Bluetooth	Yes	68
Bluetooth	No	110.32

Source16Reviewchip.de/test-kaufberatung/tv-audio/marshall-monitor-iii-a-n-c-im-test_a4725ea6-a9f4-4e8b-aa22-0f51f8c0d1c3.htmlRead 23 October 2026Tested July 11, 2026. Full-runtime table 68 h 00 min ANC on and 110 h 19 min off. CHIP describes continuous fixed-playlist Bluetooth playback at the same calibrated volume across products. Numeric SPL, codec, firmware and spatial-processing state unpublished. 110 h 19 min converted to hours. Partial 15-minute-charge runtimes excluded. SoundGuys could not complete its separate battery test and contributes no runtime.

BSennheiser ACCENTUM Plus Wireless

Connection	ANC	Hours (h)
Bluetooth	Yes	53.25

Source5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Provided unit tested three days, firmware 3.14.9, Smart Control 4.7.0. Looped standardized music peaking 75 dB SPL lasted 53 h 15 min with ANC on. Codec not named. 53.25 h actual test, distinct from 50 h maker claim.

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

110.32h=CalculatedFrom Measured battery life

53.25h=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.

253g(8.9 oz)16Reviewchip.de/test-kaufberatung/tv-audio/marshall-monitor-iii-a-n-c-im-test_a4725ea6-a9f4-4e8b-aa22-0f51f8c0d1c3.htmlRead 23 October 2026Independent CHIP test table 253 g. Cable inclusion not stated. Maker claims 250 g.

Not available

Microphone

7 of 16 differ

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

Built-in18Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Audio specification explicitly Microphone & Remote yes and maker describes phone-call handling. No unsupported speech-mic count, pattern or element added.

Built-in1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

Microphone element

Not available

MEMS1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 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

Not available

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

Not available

21Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Exact sheet says two beamforming speech microphones, corroborated manual page 6 device diagram and current maker support specification. Manual page 34 incorrectly lists four voice microphones in a 2x2 array, conflicting with those exact sources. Retain two, distinct from four ANC microphones.2Maker product pagesupport.sennheiser-hearing.com/hc/en-gb/articles/37817890197021-ACCENTUM-Plus-Wireless-SpecificationsRead 5 October 2026Current exact maker table explicitly two mics, beamforming for noise reduction, corroborating sheet and manual device diagram.

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

Not available

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

Not available

Min50Max8,000Hz1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 202650 Hz-8 kHz, confirmed manual page 34 at -3 dB.

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

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 24 multifunction button once toggles microphone during call. This is a shared physical button, not separate dedicated mute hardware.

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/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 24 explicit Mute on / Mute off voice prompts. No mic-mute LED inferred from generic power LED.

Sidetone

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

Adjustable sidetone

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 25 own voice playback controlled with app slider, can also be disabled.

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

Not available

Not available

Connectivity

9 of 20 differ

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

Bluetooth, Analog19Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed pages 4 and 7 included USB-C-to-3.5 mm cable carries analog source audio. USB-C shape does not imply USB digital playback.

Analog, USB, Bluetooth3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

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

3.5 mm TRS41Retailer pagebhphotovideo.com/c/product/1854727-REG/marshall_1006861_monitor_iii_anc_wireless.htmlRead 23 October 2026Exact Black 1006861 overview and supplied-items list explicitly USB-C to 3.5 mm TRS cable. Other B&H specification errors such as open-back enclosure and LC3 are not used.

3.5 mm TRS5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Review explicitly included TRS analog cable and 2.5 mm TRS headset socket. Maker sheet confirms 3.5 mm source plug / 2.5 mm headset plug.

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

USB-C19Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026

2.5 mm3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.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.

Not available

1.2m3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.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-C19Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026

USB-C3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.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.

No21Reviewchip.de/test-kaufberatung/tv-audio/marshall-monitor-iii-a-n-c-im-test_a4725ea6-a9f4-4e8b-aa22-0f51f8c0d1c3.htmlRead 23 October 2026Independent exact-model table explicitly USB-C-Audio no. Included 3.5 mm-to-USB-C analog cable is a separate path. ifanr exact review independently explicitly rules out USB Audio.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 29 explicitly USB audio playback and microphone recording on Mac/PC/mobile device, unlike analog mode. Bluetooth connections 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.

No19Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 7 requires headphones on before connecting analog cable. HeadphoneCheck and CHIP confirm no passive playback. Tom's Guide claims otherwise, but maker instructions take precedence.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 28 specifically analog listening when battery is empty. Bluetooth deactivates with analog cable, ANC needs battery, music/call/assistant controls unavailable.

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

Not available

Not available

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.

10m20Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker 10 m / 30 ft claim. Meters retained. Conditions not specified.

Not available

Bluetooth

5.320Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

5.21Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

SBC, AAC20Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker Codecs SBC, MPEG-2 AAC. AAC stored using common catalog spelling. LE Audio-ready is not confirmed current LC3 support.

SBC, AAC, aptX, aptX Adaptive1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Exact sheet and current maker support list classic aptX as well as aptX Adaptive, AAC and SBC. Call codecs mSBC/CVSD are not stored as music codecs. Bluetooth LE identification does not prove LE Audio or LC3.2Maker product pagesupport.sennheiser-hearing.com/hc/en-gb/articles/37817890197021-ACCENTUM-Plus-Wireless-SpecificationsRead 5 October 2026Current exact table explicitly SBC, AAC, aptX and aptX Adaptive for music.

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.

Yes19Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 13 two active Bluetooth devices, one audio source at a time.

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

219Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 8 explicitly two connected devices simultaneously.

23Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

Paired devices remembered

819Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 8 explicitly remembers eight paired devices.

63Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 13 stores up to six paired devices, seventh overwrites least-used profile. This is not six simultaneous connections.

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

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, iOS22Maker product pagemarshall.com/us/en/support/headphones/learn/app-marshall-bluetoothRead 23 October 2026Maker app page lists exact model and Apple App Store/Google Play downloads. Exact-model setup guide requires pairing host device with headphones. No desktop/console audio path inferred.

Windows, macOS, Android, iOS3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 20265Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Exact FAQ explicitly compatibility with Android and iPhone. Desktop Mac/PC USB routes are documented in full manual page 29.

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.

AMarshall Monitor III A.N.C.

Platform	Connection
Android	Bluetooth
iOS	Bluetooth

Source22Maker product pagemarshall.com/us/en/support/headphones/learn/app-marshall-bluetoothRead 23 October 2026Supported mobile setup uses Bluetooth pairing. Per-platform call microphone support is left unspecified.

BSennheiser ACCENTUM Plus Wireless

Platform	Connection
Windows	USB
macOS	USB
Android	Bluetooth
iOS	Bluetooth

Source3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 29 explicitly USB playback/recording Mac and PC. Exact SoundGuys FAQ independently confirms Android/iPhone Bluetooth compatibility. Generic mobile USB text does not establish every Android or iOS USB route.5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026

Official licence

Not available

Not available

Battery and charging

10 of 13 differ

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

Not available

800mAh1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Sheet page 3 gives two alternative battery suppliers, each one physical cell of 800 mAh at 3.7 V, 2.96 Wh or rounded 3.0 Wh. 0.8 Ah x 3.7 V = 2.96 Wh. Current maker support agrees 800 mAh. Manual page 34 incorrectly puts 5 V USB input, 700 mAh and 2.96 Wh into one battery row, inconsistent with each other. That summary row is not used.2Maker product pagesupport.sennheiser-hearing.com/hc/en-gb/articles/37817890197021-ACCENTUM-Plus-Wireless-SpecificationsRead 5 October 2026Current exact maker support specification updated August 8, 2026 explicitly 800 mAh, matching full maker sheet rather than inconsistent manual summary.

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.

224Press articlenotebookcheck.com/Marshall-stellt-neue-kabellose-ANC-Kopfhoerer-Monitor-III-A-N-C-vor.890514.0.htmlRead 23 October 2026Exact-model German launch report explicitly a double battery with one pack in each earcup. No per-pack capacity published. No total mAh divided or guessed.

11Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Sheet page 3 gives one cell installed and none outside product for each alternative supplier. Alternatives are not two simultaneously installed cells.

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.

AMarshall Monitor III A.N.C.

Connection	ANC	Hours (h)
Bluetooth	Yes	70
Bluetooth	No	100

Source23Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker battery specification explicitly Bluetooth plus ANC 70 h and Bluetooth only 100 h. Volume, codec, spatial processing and firmware not stated.

BSennheiser ACCENTUM Plus Wireless

Connection	ANC	Hours (h)
Bluetooth	Yes	50

Source1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Up to 50 hours music via Bluetooth with ANC on, iPhone at medium volume. Codec not named. No separate ANC-off claim inferred.

Battery life (claimed, max)

100h=CalculatedFrom Claimed battery life

50h=CalculatedFrom Claimed battery life

Battery life with ANC (claimed)

70h=CalculatedFrom Claimed battery life

50h=CalculatedFrom Claimed battery life

Battery life without ANC (claimed)

100h=CalculatedFrom Claimed battery life

Not available

Charging port

USB-C23Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

USB-C1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

150min23Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker 2.5 h to full recharge converted exactly to 150 minutes.

210min1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 20263Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 11 explicitly complete charging cycle about 3.5 hours, corroborating specification sheet.

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

15min23Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

10min1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

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

12h23Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker 15 minutes supplies 12 hours. ANC, codec and volume unspecified.

5h1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Sheet explicitly 10 minutes charging for up to 5 hours music, also manual page 11 diagram. ANC state and codec not specified for quick charge.

Use while charging

Not available

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 11 expressly can listen to music or make calls while charging, potentially increasing charge time. USB mode charges simultaneously on page 29.

Charging dock or stand

Not available

Not available

Controls

4 of 6 differ

Controls

Buttons25Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed pages 4-5 two buttons and multidirectional control knob. Knob moves by directional pushes, not a rotating dial or wheel. No schema joystick option exists.

Buttons, Touch3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

Volume control

Not available

Touch3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.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.

Yes25Owner's manualdownloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdfRead 23 October 2026Printed page 5 M-button assignment in app. Default Spotify Tap.

Not available

Wear detection

Yes26Reviewsoundguys.com/marshall-monitor-iii-anc-review-a-worthy-alternative-to-sony-and-bose-131654Read 23 October 2026Controls section explicitly wear sensor and automatic playback pause when removed.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 26 Smart Pause sensor pauses/resumes music, accepts calls on wearing and mutes/resumes calls on removal/replacement.

Voice assistant

Phone's voice assistant43Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Customisable M-button activates the phone's voice assistant. Maker names no specific service. It is host activation, separate from the Voice command No row for built-in voice control.

Siri, Google Assistant3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 25 explicitly connected device Siri or Google Assistant via multifunction button, using Bluetooth or USB. Smartphone/software compatibility applies. No built-in always-listening assistant license assumed.

Comfort and build

7 of 11 differ

Headband type

Not available

Padded4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026

Headband material

Silicone inner headband27Reviewnotebookcheck.com/Exklusiv-zum-Markstart-Marshall-Monitor-III-A-N-C-im-Praxis-Test-Tolles-Design-wie-ist-der-Klang.890386.0.htmlRead 23 October 2026Design section explicitly silicone inner band attached at the sides. Does not establish outer upholstery material.

Silicone lining4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026Exact maker description says soft touch silicone-lined headband. This describes the lining, not the structural core.

Frame material

Not available

Plastic yokes5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Review explicitly yokes are plastic. Structural scope is the yokes, not a guess from generic mostly-plastic wording.

Ear cup material

Plastic27Reviewnotebookcheck.com/Exklusiv-zum-Markstart-Marshall-Monitor-III-A-N-C-im-Praxis-Test-Tolles-Design-wie-ist-der-Klang.890386.0.htmlRead 23 October 2026Design section explicitly flexible plastic cup shell. Decorative leather-like texture is not treated as leather shell.

Not available

Ear pad material

Vegan leather and foam28Retailer pageargos.co.uk/product/3347382/GM-VariantRead 23 October 2026Exact Black listing names Vegan Leather and Foam ear pieces. Not interpreted as natural leather.

Leather-like covering5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Review explicitly leather-like cushions. Real animal leather not asserted.

Replaceable ear pads

Yes29Owner's manualdownloads.ctfassets.net/javen7msabdh/2hCtX2YRHbepO0vP6hwRex/437db6a71a057973414ed7d097217311/Monitor-III-ANC-spareparts_user-manual_all-languages.pdfRead 23 October 2026

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 30 explicitly instructions to remove/replace pads, press into earcup notch. No clip/twist/magnetic attachment enum guessed from generic notch.

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 lock29Owner's manualdownloads.ctfassets.net/javen7msabdh/2hCtX2YRHbepO0vP6hwRex/437db6a71a057973414ed7d097217311/Monitor-III-ANC-spareparts_user-manual_all-languages.pdfRead 23 October 2026Printed page 3 rotate anticlockwise to remove and clockwise to lock.

Not available

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

Not available

Not available

Ear tips included

Not available

Not available

Dust and water rating

Not available

Not available

User-replaceable parts

Ear cushions, Inner headband29Owner's manualdownloads.ctfassets.net/javen7msabdh/2hCtX2YRHbepO0vP6hwRex/437db6a71a057973414ed7d097217311/Monitor-III-ANC-spareparts_user-manual_all-languages.pdfRead 23 October 2026Printed pages 3-5 exact replacement procedures. Inner headband uses T5 Torx screwdriver. Battery is not in this user replacement manual.

Ear pads3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

Software

1 of 3 differ

Companion app

Marshall Bluetooth30Maker product pagemarshall.com/us/en/support/headphones/learn/app-marshall-bluetoothRead 23 October 2026

Sennheiser Smart Control1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

App platforms

Android, iOS30Maker product pagemarshall.com/us/en/support/headphones/learn/app-marshall-bluetoothRead 23 October 2026Maker lists exact model with Apple App Store and Google Play links.

Android, iOS1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026

User firmware updates

Yes30Maker product pagemarshall.com/us/en/support/headphones/learn/app-marshall-bluetoothRead 23 October 2026Exact-model support page explicitly app firmware updates.31Maker product pagemarshall.com/us/en/support/headphones/support-for-monitor-iii-ancRead 23 October 2026Update the firmware section explicitly app updates for Monitor III A.N.C.

Yes3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

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.

250g(8.8 oz)32Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Current maker physical-unit table 250 g. No cable qualification stated. SoundGuys and CHIP measured information stays separate.

227g(8 oz)1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Approximately 227 g device only, not 582 g packaged weight or 6520 g master carton.

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

Width165Height195Depth48mm(6.5 × 7.7 × 1.9 in)1Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Sheet page 3 explicitly 165 x 195 x 48 mm folded flat. Current support reproduces 16.5 x 19.5 x 4.8 without unit, and SoundGuys depth 480 mm is a transcription error. Use exact maker millimetre table.2Maker product pagesupport.sennheiser-hearing.com/hc/en-gb/articles/37817890197021-ACCENTUM-Plus-Wireless-SpecificationsRead 5 October 2026Current table labels folded-flat dimensions but omits the centimetre unit. Exact millimetre dimensions come from the full maker sheet.

Certifications

0 of 3 differ

Hi-Res Audio

Not available

Not available

Communication certifications

Not available

Not available

FCC ID

2BBQK-MONITIII33Regulatory filingfccid.io/2BBQK-MONITIIIRead 23 October 2026Public FCC filing index for exact MONITIII headphone, approved April 29, 2024. Referenced label/internal documents could not be downloaded because of access denial. No hidden exhibit data used.

Not available

Other certifications

Not available

Not available

In the box

3 of 3 differ

In the box

Monitor III A.N.C. Headphones, USB-C charging cable, USB-C to 3.5mm audio cord, Quick start guide, Legal and Safety Information, Carrying case34Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

Sennheiser ACCENTUM Plus headphones, USB-A to USB-C cable, 3.5 mm to 2.5 mm audio cable, Carry case, Quick guide, Safety guide, Compliance sheet3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Page 5 complete exact list, USB A to C cable, analog 3.5 mm stereo plug approx. 1.2 m, case and three documents. No airline adapter included.

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

AMarshall Monitor III A.N.C.

Type	Length (m)	Count
USB-C to USB-C charging cable	0.21	1
USB-C to 3.5 mm stereo audio cable	Not available	1

Source34Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker box list confirms both cables. Manual page 4 confirms USB-C-to-USB-C charging lead. HeadphoneCheck states 21 cm charging lead. Audio length is omitted because HeadphoneCheck says 120 cm and SoundGuys says 122 cm while maker is silent.35Reviewheadphonecheck.com/test/marshall-monitor-iii-a-n-cRead 23 October 2026Scope of delivery explicitly charging cable 21 cm and analog cable 120 cm. Only uncontested charging length retained. SoundGuys metadata says 122 cm for analog cable.

BSennheiser ACCENTUM Plus Wireless

Type	Length (m)	Count
USB-A to USB-C cable	Not available	1
3.5 mm to 2.5 mm stereo audio cable	1.2	1

Source3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026

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

Hard34Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026Maker explicitly hard case, also described in manual page 6.

Soft5Reviewsoundguys.com/sennheiser-accentum-plus-review-110432Read 5 October 2026Review explicitly says soft-shell case. Maker packaging Hard box is the retail carton, not a hard carry case.

Links

Not compared

Product page

www.marshall.com/us/en/product/monitor-iii-anc36Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

us.sennheiser-hearing.com/products/accentum-plus4Maker product pageus.sennheiser-hearing.com/products/accentum-plusRead 5 October 2026Exact current maker product public JSON https://us.sennheiser-hearing.com/products/accentum-plus.js directly opened including product description, image array and SKU cells. Wrong /accentum-plus-wireless handle returns 404 and is not used.

Spec sheet

www.marshall.com/us/en/product/monitor-iii-anc36Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

boulanger.scene7.com/is/content/Boulanger/4260752330596_f_01Maker spec sheet (PDF)boulanger.scene7.com/is/content/Boulanger/4260752330596_f_0Read 5 October 2026Full three-page maker specification sheet hosted by retailer Boulanger, dated 09/23. Technical and battery tables pages 2-3 opened and visually checked. Packaging and master-carton figures are not product dimensions or weight.

Manual

downloads.ctfassets.net/javen7msabdh/Y4lwjaW2ma8v33Kx2ZXCz/d55009139a27c6786e45675a034af6e2/Marshall-Monitor-III-ANC-All-Languages.pdf36Maker product pagemarshall.com/us/en/product/monitor-iii-ancRead 23 October 2026

cdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdf3Owner's manualcdn.sennheiser-hearing.com/product-documents/product-downloads/accentum-plus-wireless/Instruction%20manual%20ACCENTUM%20Plus/Instruction_manual_ACCENTUM_Plus.pdfRead 5 October 2026Full 36-page official English manual version 08/25 A02 directly opened. Source conflicts in page 34 battery and speech-mic summary are explicitly resolved against full maker sheet and current support table. Page 35 warranty says 12 months, then generic most products 2-year wording. Warranty omitted pending exact market conditions.

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.

1year37Maker product pagemarshall.com/us/en/support/warrantyRead 23 October 2026US support default warranty one year from purchase. Online Marshall purchases receive an exclusive two-year term. Base field stores default term, separate from legal guarantees.

Not available

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