HEADPHONES · YOUR NEXT FACE-OFF

Sennheiser HD 300 PROtect vs Sennheiser MOMENTUM 4 Wireless

Real specs. Clear sources.Exact models · UK & US buying links

Compared products

YOUR FIRST CHOICE

Sennheiser HD 300 PROtect

506898 · HD 300 PROtect (with ActiveGard) · wired

Full product profile Official image

Exact model & source notes

The HD 300 PROtect (article 506898) is the HD 300 PRO closed-back, around-ear monitoring headphone with Sennheiser's switchable ActiveGard limiter, which limits peaks above 110 dB. It shares the HD 300 PRO's passive attenuation (rated up to 32 dB), 64 Ω impedance, approx. 297 g weight without cable and replaceable pads, headband padding and cable. It is passive, with no microphone or active noise cancellation. Sennheiser lists a two-year warranty.

Specifications checked 27 Sept 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

WHICH SUITS YOU?

Choose the HD 300 PROtect for

Higher stated nominal impedance: 64 ohm vs 60 ohm

Choose the MOMENTUM 4 Wireless for

Both wired and wireless connections
Active noise cancellation: Yes vs No
Microphone: Yes vs No

Built from verified specifications that differ. Not a rating or a recommendation.

See the 11 verified differences

THE CONTENDER

Sennheiser MOMENTUM 4 Wireless

Black · model M4AEBT

Full product profile Official image

Exact model & source notes

The MOMENTUM 4 Wireless (article 509266, black) is Sennheiser's closed-back, around-ear Bluetooth headphone with hybrid adaptive noise cancellation, a Transparency Mode, a 42 mm dynamic driver and a rated 60 hours of playback with ANC on. Sennheiser's app adds EQ, presets, sound modes and Sound Personalization, and Smart Pause and Auto On/Off react to the headphones being taken off. It also plays over USB-C from a computer or over a supplied analogue cable.

Specifications checked 26 Sept 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

HD 300 PROtect UK & US retailers

UK & US price history: no verified listing yet

MOMENTUM 4 Wireless UK & US retailers

UK & US price history: no verified listing yet

Search links open retailer results, not a matched listing; eBay listings are checked daily. As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, we may be compensated if you make a purchase.

THE DIFFERENCES, MADE VISIBLE

Visual facts

Differences first. Select a topic for its graphic, sources and conditions.

How to read this comparison

Manufacturer facts for the exact models shown. Not a quality rating or a test result.
“Different” means the known values differ, not that one is better.
Missing or conflicting evidence is marked and never counts as a difference. Source chips hold each fact’s sources and conditions.

FEATURES SIDE BY SIDE7 topics

Yes and No describe the listed feature. Missing evidence stays unverified.

SELECTED TOPIC

01 / 07

Impedance

Nominal electrical load, not sound quality or loudness. Output capability and headphone sensitivity matter together; impedance alone cannot decide whether an amplifier is needed.

Sennheiser HD 300 PROtect64 Ω

Source 1 Source 2

Sennheiser MOMENTUM 4 Wireless60 Ω

Manufacturer specification · Passive (analogue cable) mode; the page lists 470 ohms in active mode.

Source 1

Explore the full specifications

Start with your listening environment. Open and closed earcups suit different surroundings. A closed back is not the same as active noise cancellation. Check the exact cable and headphone output. We do not turn impedance, driver size or unpaired lab results into a sound-quality score.

WHAT CHANGES BETWEEN THEM?

Key differences

Full specifications ↓

11 verified differences, most decision-relevant first. 2 are also drawn in Visual facts above. Missing information stays separate.

Wired / wireless connections

Sennheiser HD 300 PROtectWired; exchangeable 1.5 m cable with 3.5 mm jack on Sennheiser's system connector, and supplied 6.3 mm (1/4") stereo jack adapter

Sennheiser MOMENTUM 4 WirelessBluetooth 5.2 (SBC, AAC, aptX Adaptive); USB-C for charging, calls and streaming from a PC/Mac; 2.5 mm analogue input with supplied 2.5 mm-to-3.5 mm cable

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · The box list names a 1.5 m cable; the specification sheet and quick guide give approx. 1.55 m.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Connecting the analogue cable switches Bluetooth off (flight mode). The UK product page additionally lists standard aptX.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check the exact configuration and source conditions for your use.

Active noise cancellation

Sennheiser HD 300 PROtectNo

Sennheiser MOMENTUM 4 WirelessYes

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Attenuation is passive: the page lists 'Noise cancellation (db) Max 32 dB (passive)' and no battery. ActiveGard is a peak limiter, not noise cancellation.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Hybrid adaptive ANC with a Transparency Mode.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check the exact configuration and source conditions for your use.

Microphone

In Visual facts

Sennheiser HD 300 PROtectNo

Sennheiser MOMENTUM 4 WirelessYes

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Monitoring headphones; no microphone is listed in the specifications or package contents.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Four MEMS speech microphones in a 2 × 2 beamforming array for calls.

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check the exact configuration and source conditions for your use.

Battery life

Sennheiser HD 300 PROtectNot required: passive wired headphones powered by the audio source

Sennheiser MOMENTUM 4 WirelessUp to 60 hours of Bluetooth music playback with ANC on; approx. 2 hours to charge fully, with 5 minutes giving up to 4 hours

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · The product page lists 'Battery included: N'.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Sennheiser's test condition: iPhone at mid volume. Built-in 700 mAh battery (the manual and UK page disagree on its chemistry).

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Manufacturer claims for the stated mode and equipment. Read each test condition; this is not measured everyday battery life.

Nominal impedance

In Visual facts

Sennheiser HD 300 PROtect64 ohm

Sennheiser MOMENTUM 4 Wireless60 ohm

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Passive (analogue cable) mode; the page lists 470 ohms in active mode.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications

Check the exact configuration and source conditions for your use.

Driver construction

Sennheiser HD 300 PROtectDynamic transducers with precision diaphragms

Sennheiser MOMENTUM 4 Wireless42 mm dynamic transducer

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Sennheiser does not state the transducer diameter on the pages and documents read.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check whether the diameter describes the complete transducer or only its diaphragm. Different labels and driver sizes do not establish better sound.

Show 5 more verified differences

Rated total harmonic distortion

Sennheiser HD 300 PROtect<0.1% at 1 kHz, 94 dB SPL

Sennheiser MOMENTUM 4 Wireless<0.3% at 1 kHz, 100 dB SPL

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

These published limits can use different input voltages, loudness levels and standards. They cannot establish lower distortion in matched listening conditions.

Rated frequency range

Sennheiser HD 300 PROtect6–25,000 Hz

Sennheiser MOMENTUM 4 Wireless6–22,000 Hz (−10 dB)

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · No level tolerance is stated.

Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Range endpoints need their stated threshold. They do not describe response flatness or prove better bass, detail or sound quality.

In the box

Sennheiser HD 300 PROtectHD 300 PROtect headphones, 1.5 m cable with 3.5 mm jack, 6.3 mm (1/4") stereo jack adapter, quick guide

Sennheiser MOMENTUM 4 WirelessHeadphones, USB-C to USB-A cable (approx. 1.2 m), 2.5 mm-to-3.5 mm audio cable (approx. 1.2 m), in-flight adapter, carry case

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check the exact configuration and source conditions for your use.

Operating temperature

Sennheiser HD 300 PROtect−15 °C to +55 °C

Sennheiser MOMENTUM 4 Wireless0 °C to +40 °C

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Relative humidity up to 90%.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Check the exact configuration and source conditions for your use.

Rated sensitivity

Sennheiser HD 300 PROtect108 ±3 dB SPL (1 kHz, 1 Vrms)

Sennheiser MOMENTUM 4 Wireless106 dB SPL (1 kHz, 0 dBFS)

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Voltage reference (dB/V), not dB/mW.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Digital full-scale reference; not comparable with passive headphones' dB/mW or dB/V ratings.

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Keep the frequency and voltage or power reference attached. Sensitivity describes output for an input, not sound quality; dB/V and dB/mW are different measures.

Small physical differences (1)

Weight

Sennheiser HD 300 PROtect297 g

Sennheiser MOMENTUM 4 Wireless293 g

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Approximate, without cable, per the specification sheet and quick guide covering both HD 300 PRO and HD 300 PROtect. The product page separately lists 'Product weight (g) 550' without a basis.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Approximate, headphones only; the manual does not state a cable-inclusive figure.

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

A size or weight trade-off; it does not establish the better product.

Configuration & compatibility details (1)

Wearing style

Sennheiser HD 300 PROtectOver-ear (circumaural), closed-back wired monitoring headphones

Sennheiser MOMENTUM 4 WirelessOver-ear (circumaural), closed-back wireless headphones with a foldable design

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Sennheiser's US store describes a 'Lightweight, foldable design'; the instruction manual says to fold up the headphones and place them in the carry case.

Sennheiser US store — MOMENTUM 4 Wireless product variant data (SKU and UPC per colour)Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Both sources describe the same wearing style and acoustic design in different words. The extra wording does not establish a different fit; compare the separately listed fields.

Missing or non-comparable evidence (17)

App sound controls

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessSennheiser Smart Control app: built-in EQ, presets, sound modes (e.g. bass boost) and Sound Personalization

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Requires the Sennheiser app on a smartphone; the product page also names it Smart Control Plus.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Battery

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessBuilt-in, 3.7 V, 700 mAh, 2.59 Wh

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Capacity agrees across sources (manual 700 mAh, 2.59 Wh; UK page 700 mAh); the chemistry does not, see battery chemistry.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Battery chemistry

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessConflicting evidence

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

The instruction manual states a built-in rechargeable lithium-polymer battery; the UK product page states 'Built-in Lithium-Ion rechargeable batteries 700 mAh'. · Manufacturer specification

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Bluetooth codecs

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessSBC, AAC, aptX, aptX Adaptive

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Standard aptX is listed on the UK product page ('SBC, AAC, aptX™, aptX adaptive™'); the instruction manual lists only aptX Adaptive, AAC and SBC.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Cable arrangement

Sennheiser HD 300 PROtectExchangeable cable on Sennheiser's system connector; Sennheiser describes a coiled cable that filters structure-borne noise at the earpiece

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Cable length

Sennheiser HD 300 PROtect1.55 m

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Approximate; the box list names the cable as 1.5 m.

Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Charging

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessUSB-C; approx. 2 hours for a full charge

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · The maximum charging input differs between Sennheiser's sources: the instruction manual lists 5 V, 750 mA max; the UK product page lists 5 V, 800 mA max. Neither figure is chosen.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Contact pressure

Sennheiser HD 300 PROtectApprox. 6 N

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Controls and sensors

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessTouch pad on the right ear cup (tap, horizontal and vertical swipe, stretch and pinch gestures) and a multi-function button; Smart Pause pauses playback when the headphones are taken off and resumes when they are put back on; Auto On/Off powers up when picked up and shuts down when not in use; automatic wind noise reduction

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Sennheiser describes the touch interface as controlling music, calls, ANC and voice assistants; the manual adds volume (vertical swipe) and switching between ANC and Transparency Mode (double tap), and says the touch pad function can be deactivated in the Smart Control app. The multi-function button is the on/off, voice assistant and pairing button. Wind Noise Reduction is set in the Smart Control app's Active Noise Cancellation section (Off, Auto by default, or Max); the UK page describes automatic wind noise suppression for calls.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser US store — MOMENTUM 4 Wireless product variant data (SKU and UPC per colour)Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Ear pads

Sennheiser HD 300 PROtectViscoelastic; replaceable

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rated power

Sennheiser HD 300 PROtect500 mW

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · The datasheet labels this 'Power rating'; the product page lists the same figure as 'Power consumption (Amp)'.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Maximum sound pressure level

Sennheiser HD 300 PROtect123 dB SPL at 1 kHz (ActiveGard off); 110 dB SPL at 1 kHz (ActiveGard on)

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Simultaneous Bluetooth connections

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 Wireless2

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification

Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Ambient noise attenuation

Sennheiser HD 300 PROtectUp to 32 dB (passive)

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Passive attenuation; not active noise cancellation.

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Serviceability

Sennheiser HD 300 PROtectModular: ear pads, headband padding and cable are replaceable

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification

Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO | HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Hearing protection and comfort

Sennheiser HD 300 PROtectSwitchable ActiveGard limiter that limits peaks above 110 dB; recess for the fontanelle for pressure distribution and wearing comfort

Sennheiser MOMENTUM 4 WirelessNot verified

Sources

Sennheiser HD 300 PROtect

Manufacturer specification · Sennheiser states that the HD 300 PROtect's switchable ActiveGard hearing protection satisfies international directives on industrial safety and noise control.

Sennheiser MOMENTUM 4 Wireless

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Transparency (ambient) mode

Sennheiser HD 300 PROtectNot verified

Sennheiser MOMENTUM 4 WirelessYes

Sources

Sennheiser HD 300 PROtect

No source recorded for this side.

Sennheiser MOMENTUM 4 Wireless

Manufacturer specification · Activated with a touch, according to Sennheiser's UK product page.

Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

1 shared field has the same recorded value.

YOUR HEADPHONES. YOUR RULES.

Check against your must-haves

Feature matching for the features you select. It doesn’t rate sound or comfort.

Start with your listening setup.

Choose a starting point, then fine-tune your must-haves.

FINE-TUNE THE DETAILS

Your essentials.

These shortcuts select the features shown above. Check the fit against your own equipment and listening space.

A feature match describes the selected requirements. It doesn’t rate sound or comfort.

Open-back designFor a quiet listening spaceClosed-back designAn enclosed outer earcupDetachable cableUnplug the cable at the headphonesBuilt-in microphoneFor calls and voice chatActive noise cancellationNot the same as a closed back

YOUR CHOICE

Sennheiser HD 300 PROtect

Select a feature to check your fit.

YOUR CHOICE

Sennheiser MOMENTUM 4 Wireless

Select a feature to check your fit.

Feature matching, not a sound-quality score. The specification table links to the evidence for each feature.

WHAT EACH CHOICE ASKS OF YOU

What it brings and what to check

Sennheiser HD 300 PROtect

What it brings

The switchable ActiveGard limiter caps the maximum level at 110 dB SPL when on (123 dB SPL when off), for live, broadcast and high-SPL work.
Manufacturer source Manufacturer source Manufacturer source
Sennheiser rates up to 32 dB of passive ambient-noise attenuation, and the pads, headband padding and cable are replaceable.
Manufacturer source Manufacturer source

What to check

Sennheiser's product page lists an unexplained 550 g 'product weight', while its specification sheet and quick guide give approx. 297 g without cable.
Manufacturer source Manufacturer source Manufacturer source
There is no microphone, wireless connection or active noise cancellation; the ActiveGard limiter is hearing protection against peaks, not noise cancellation.
Manufacturer source Manufacturer source

Sennheiser MOMENTUM 4 Wireless

What it brings

Sennheiser rates the battery at up to 60 hours of Bluetooth playback with ANC switched on, with about 2 hours for a full charge and 5 minutes giving up to 4 hours.
Manufacturer source Manufacturer source
Besides Bluetooth 5.2 with aptX Adaptive and two simultaneous connections, it accepts USB-C audio from a PC or Mac and an analogue cable for flight use.
Manufacturer source

What to check

The analogue input is a 2.5 mm socket, so the supplied cable (or a similar one) is needed; plugging it in turns Bluetooth off.
Manufacturer source
Sennheiser rates the mass at about 293 g for the headphones alone, and its 106 dB sensitivity figure uses a digital full-scale reference, so it cannot be compared with passive headphones' ratings.
Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

31 of 31 specifications Sources in each row

Source-backed specifications for Sennheiser HD 300 PROtect and Sennheiser MOMENTUM 4 Wireless
Specification	Sennheiser HD 300 PROtect	Sennheiser MOMENTUM 4 Wireless

Wearing styleDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Sennheiser's US store describes a 'Lightweight, foldable design'; the instruction manual says to fold up the headphones and place them in the carry case. Sennheiser US store — MOMENTUM 4 Wireless product variant data (SKU and UPC per colour)Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Over-ear (circumaural), closed-back wired monitoring headphones	Over-ear (circumaural), closed-back wireless headphones with a foldable design
Acoustic design Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Closed-back	Closed-back
WeightDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Approximate, without cable, per the specification sheet and quick guide covering both HD 300 PRO and HD 300 PROtect. The product page separately lists 'Product weight (g) 550' without a basis. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Approximate, headphones only; the manual does not state a cable-inclusive figure. Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	297 g	293 g
Contact pressure Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless No source recorded.	Approx. 6 N	Not provided
Ear pads Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless No source recorded.	Viscoelastic; replaceable	Not provided
Serviceability Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless No source recorded.	Modular: ear pads, headband padding and cable are replaceable	Not provided

Wired / wireless connectionsDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · The box list names a 1.5 m cable; the specification sheet and quick guide give approx. 1.55 m. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Connecting the analogue cable switches Bluetooth off (flight mode). The UK product page additionally lists standard aptX. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Wired; exchangeable 1.5 m cable with 3.5 mm jack on Sennheiser's system connector, and supplied 6.3 mm (1/4") stereo jack adapter	Bluetooth 5.2 (SBC, AAC, aptX Adaptive); USB-C for charging, calls and streaming from a PC/Mac; 2.5 mm analogue input with supplied 2.5 mm-to-3.5 mm cable
Cable arrangement Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless No source recorded.	Exchangeable cable on Sennheiser's system connector; Sennheiser describes a coiled cable that filters structure-borne noise at the earpiece	Not provided
Cable length Sources Sennheiser HD 300 PROtect Manufacturer specification · Approximate; the box list names the cable as 1.5 m. Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless No source recorded.	1.55 m	Not provided
Battery lifeDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · The product page lists 'Battery included: N'. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Sennheiser's test condition: iPhone at mid volume. Built-in 700 mAh battery (the manual and UK page disagree on its chemistry). Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not required: passive wired headphones powered by the audio source	Up to 60 hours of Bluetooth music playback with ANC on; approx. 2 hours to charge fully, with 5 minutes giving up to 4 hours
Bluetooth codecs Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Standard aptX is listed on the UK product page ('SBC, AAC, aptX™, aptX adaptive™'); the instruction manual lists only aptX Adaptive, AAC and SBC. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	SBC, AAC, aptX, aptX Adaptive
Simultaneous Bluetooth connections Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	2
Charging Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · The maximum charging input differs between Sennheiser's sources: the instruction manual lists 5 V, 750 mA max; the UK product page lists 5 V, 800 mA max. Neither figure is chosen. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	USB-C; approx. 2 hours for a full charge
Battery Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Capacity agrees across sources (manual 700 mAh, 2.59 Wh; UK page 700 mAh); the chemistry does not, see battery chemistry. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	Built-in, 3.7 V, 700 mAh, 2.59 Wh

Hearing protection and comfort Sources Sennheiser HD 300 PROtect Manufacturer specification · Sennheiser states that the HD 300 PROtect's switchable ActiveGard hearing protection satisfies international directives on industrial safety and noise control. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless No source recorded.	Switchable ActiveGard limiter that limits peaks above 110 dB; recess for the fontanelle for pressure distribution and wearing comfort	Not provided
Driver constructionDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Sennheiser does not state the transducer diameter on the pages and documents read. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Dynamic transducers with precision diaphragms	42 mm dynamic transducer
Rated frequency rangeDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · No level tolerance is stated. Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	6–25,000 Hz	6–22,000 Hz (−10 dB)
Nominal impedanceDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Passive (analogue cable) mode; the page lists 470 ohms in active mode. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications	64 ohm	60 ohm
Rated sensitivityDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Voltage reference (dB/V), not dB/mW. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Digital full-scale reference; not comparable with passive headphones' dB/mW or dB/V ratings. Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	108 ±3 dB SPL (1 kHz, 1 Vrms)	106 dB SPL (1 kHz, 0 dBFS)
Maximum sound pressure level Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless No source recorded.	123 dB SPL at 1 kHz (ActiveGard off); 110 dB SPL at 1 kHz (ActiveGard on)	Not provided
Rated total harmonic distortionDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0)Sennheiser HD 300 PRO / PROtect — quick guide (Publ. 07/18) Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	<0.1% at 1 kHz, 94 dB SPL	<0.3% at 1 kHz, 100 dB SPL
Rated power Sources Sennheiser HD 300 PROtect Manufacturer specification · The datasheet labels this 'Power rating'; the product page lists the same figure as 'Power consumption (Amp)'. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless No source recorded.	500 mW	Not provided

MicrophoneDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Monitoring headphones; no microphone is listed in the specifications or package contents. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Four MEMS speech microphones in a 2 × 2 beamforming array for calls. Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	No	Yes
Active noise cancellationDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Attenuation is passive: the page lists 'Noise cancellation (db) Max 32 dB (passive)' and no battery. ActiveGard is a peak limiter, not noise cancellation. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Hybrid adaptive ANC with a Transparency Mode. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	No	Yes
Ambient noise attenuation Sources Sennheiser HD 300 PROtect Manufacturer specification · Passive attenuation; not active noise cancellation. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless No source recorded.	Up to 32 dB (passive)	Not provided
Transparency (ambient) mode Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Activated with a touch, according to Sennheiser's UK product page. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications	Not provided	Yes

App sound controls Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Requires the Sennheiser app on a smartphone; the product page also names it Smart Control Plus. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	Sennheiser Smart Control app: built-in EQ, presets, sound modes (e.g. bass boost) and Sound Personalization
Controls and sensors Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless Manufacturer specification · Sennheiser describes the touch interface as controlling music, calls, ANC and voice assistants; the manual adds volume (vertical swipe) and switching between ANC and Transparency Mode (double tap), and says the touch pad function can be deactivated in the Smart Control app. The multi-function button is the on/off, voice assistant and pairing button. Wind Noise Reduction is set in the Smart Control app's Active Noise Cancellation section (Off, Auto by default, or Max); the UK page describes automatic wind noise suppression for calls. Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser US store — MOMENTUM 4 Wireless product variant data (SKU and UPC per colour)Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	Touch pad on the right ear cup (tap, horizontal and vertical swipe, stretch and pinch gestures) and a multi-function button; Smart Pause pauses playback when the headphones are taken off and resumes when they are put back on; Auto On/Off powers up when picked up and shuts down when not in use; automatic wind noise reduction

In the boxDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	HD 300 PROtect headphones, 1.5 m cable with 3.5 mm jack, 6.3 mm (1/4") stereo jack adapter, quick guide	Headphones, USB-C to USB-A cable (approx. 1.2 m), 2.5 mm-to-3.5 mm audio cable (approx. 1.2 m), in-flight adapter, carry case

Operating temperatureDifferent Sources Sennheiser HD 300 PROtect Manufacturer specification · Relative humidity up to 90%. Sennheiser HD 300 PROtect (article 506898) — official UK product page and technical data Sennheiser HD 300 PRO \| HD 300 PROtect — product specification sheet (EN, SP 1184 v1.0) Sennheiser MOMENTUM 4 Wireless Manufacturer specification Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	−15 °C to +55 °C	0 °C to +40 °C

Show unverified (1)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Battery chemistry Sources Sennheiser HD 300 PROtect No source recorded. Sennheiser MOMENTUM 4 Wireless The instruction manual states a built-in rechargeable lithium-polymer battery; the UK product page states 'Built-in Lithium-Ion rechargeable batteries 700 mAh'. · Manufacturer specification Sennheiser MOMENTUM 4 Wireless — official UK product page and specifications Sennheiser MOMENTUM 4 (M4AEBT) — instruction manual, version 07/25	Not provided	Conflicting sources

First product manufacturer source Second product manufacturer source

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Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.