HEADPHONES · YOUR NEXT FACE-OFF

Beyerdynamic AVENTHO 300 vs Sennheiser HD 820

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

Compared products

YOUR FIRST CHOICE

Beyerdynamic AVENTHO 300

1000981 · Black

Full product profile Official image

Exact model & source notes

The AVENTHO 300 (article 1000981, black) is beyerdynamic's closed-back, foldable over-ear Bluetooth headphone with adaptive hybrid ANC, STELLAR.45 dynamic drivers and Bluetooth 5.4 multipoint. beyerdynamic rates the battery at up to 50 hours with ANC on.

Specifications checked 26 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 Beyerdynamic AVENTHO 300 for

A wireless connection

Choose the Sennheiser HD 820 for

A wired connection

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

See the 5 verified differences

THE CONTENDER

Sennheiser HD 820

507435 · Black · wired, with 6.35 mm and 4.4 mm cables

Full product profile Official image

Exact model & source notes

The HD 820 (article 507435) is Sennheiser's reference-class closed-back audiophile headphone, with a 56 mm Ring Radiator dynamic transducer behind concave Gorilla Glass reflectors, 300-ohm impedance, a rated 360 g without cable, and both 6.35 mm unbalanced and 4.4 mm balanced cables in the box.

Specifications checked 26 Sept 2026.

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

Manufacturer specifications

Beyerdynamic AVENTHO 300 UK & US retailers

UK & US price history: no verified listing yet

Sennheiser HD 820 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 SIDE6 topics

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

SELECTED TOPIC

01 / 06

Open-back design

Open-back earcups are not sealed. Start here if your listening space is quiet; this construction is not a sound-quality rating.

Beyerdynamic AVENTHO 300: closed-back · illustration, not to scale

Sennheiser HD 820: closed-back · illustration, not to scale

Beyerdynamic AVENTHO 300No

Closed-back. Manufacturer specification

Source 1 Source 2

Sennheiser HD 820No

Closed-back. Manufacturer specification

Source 1

Choose your must-haves

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 ↓

5 verified differences, most decision-relevant first. Missing information stays separate.

Wired / wireless connections

Beyerdynamic AVENTHO 300Bluetooth 5.4 with multipoint (AAC, aptX Lossless, aptX Adaptive, LE Audio); USB-C charging port; supplied 3.5 mm mini-jack cable

Sennheiser HD 820Wired analogue; detachable 3 m cables with 6.35 mm unbalanced plug (fitted) and 4.4 mm balanced plug, both supplied; XLR-4 balanced cable optional

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · The sources do not say whether the USB-C port carries audio; only charging is stated.

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification · Sennheiser's box list names only the 6.35 mm unbalanced and 4.4 mm balanced cables; no 3.5 mm plug or adapter is listed.

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

Check the exact configuration and source conditions for your use.

Driver construction

Beyerdynamic AVENTHO 300Dynamic STELLAR.45 drivers, angled

Sennheiser HD 82056 mm Ring Radiator dynamic transducer with concave Gorilla Glass reflectors

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · beyerdynamic's driver name; a diameter is not stated in the sources read.

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications

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

Rated frequency range

Beyerdynamic AVENTHO 3005–22,000 Hz

Sennheiser HD 82012–43,800 Hz (−3 dB); 6–48,000 Hz (−10 dB)

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

In the box

Beyerdynamic AVENTHO 300Headphones, USB-C to USB-C charging cable, USB-A to USB-C adapter, 3.5 mm mini-jack cable, drawstring bag, hard case, quick start guide, compliance booklet

Sennheiser HD 820Headphones, cable with 6.35 mm unbalanced plug (fitted), cable with 4.4 mm balanced plug, instruction manual, storage box, microfibre cloth

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications

Check the exact configuration and source conditions for your use.

Weight

Beyerdynamic AVENTHO 300319 g

Sennheiser HD 820360 g

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · Headphones without cable, per the product pages; the spec sheet gives 319 g without stating the basis.

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 BLACK — official North America store page and technical data beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification · Without the connection cable, per Sennheiser's UK store data ('360 g without cable'); the product-page table gives 360 g.

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Configuration & compatibility details (1)

Wearing style

Beyerdynamic AVENTHO 300Over-ear (circumaural), closed-back, foldable wireless headphones

Sennheiser HD 820Over-ear (circumaural), closed-back dynamic headphones

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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 (16)

Active noise cancellation

Beyerdynamic AVENTHO 300Yes

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · Adaptive hybrid ANC with a transparency mode.

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

The reviewed exact sources do not explicitly establish active noise cancellation absence. Preserve separately sourced acoustic design and passive attenuation; they cannot turn omitted ANC into a false capability. · Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Microphone

In Visual facts

Beyerdynamic AVENTHO 300Yes

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · Six digital MEMS microphones for calls and ANC.

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

The reviewed exact sources do not explicitly establish microphone absence. Omission from a package or technical inventory, a stereo audio connector, and a without-remote statement do not establish microphone=false. · Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications

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

Battery life

Beyerdynamic AVENTHO 300Up to 50 hours with ANC on; approx. 2 hours to charge; 10 minutes of quick charging gives 5 hours of playback

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · beyerdynamic's rating with ANC switched on; test source and volume are not stated. Charging temperature range +10 to +40 °C.

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

The reviewed exact sources do not explicitly establish battery life or that no battery is required for operation. A wired/dynamic audio path, omitted charger or Battery included N is not an explicit operating-power requirement. · Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications

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

Nominal impedance

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 820300 ohm

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Bluetooth codecs

Beyerdynamic AVENTHO 300AAC, aptX Lossless, aptX Adaptive, LE Audio

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification · SBC is not listed in the official codec lists.

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Bluetooth version and profiles

Beyerdynamic AVENTHO 300Bluetooth 5.4; A2DP 1.3.2, AVRCP 1.6.2, HFP 1.8, AVDTP 1.3, AVCTP 1.4, GAVDP 1.3, SPP-B 1.2, RFCOMM 1.2, IOPT

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Cable length

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 8203 m

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Charging

Beyerdynamic AVENTHO 300USB-C; USB-C to USB-C cable and USB-A to USB-C adapter supplied

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Connectors

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 8206.35 mm unbalanced (3-pin) and 4.4 mm balanced (5-pin) supplied; XLR-4 balanced (4-pin) cable optional

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Controls and app

Beyerdynamic AVENTHO 300Touch pad; beyerdynamic app with 5-band equaliser and over-the-air firmware updates; wear detection pauses and resumes playback

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Rated total harmonic distortion

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 820<0.02% (1 kHz, 100 dB SPL)

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

Manufacturer specification · From the product page's specification table; the same page's feature list states 'Total harmonic distortion: 0.02 % (1 kHz 1 Vrms)', a different test condition.

Sennheiser HD 820 — official UK product page and specifications

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

Driver size

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 82056 mm

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

Manufacturer specification

Sennheiser HD 820 — official UK product page and specifications

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

Operating temperature

Beyerdynamic AVENTHO 300-10 °C to +50 °C

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Rated sensitivity

Beyerdynamic AVENTHO 300Not verified

Sennheiser HD 820103 dB SPL (1 kHz, 1 Vrms)

Sources

Beyerdynamic AVENTHO 300

No source recorded for this side.

Sennheiser HD 820

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

Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)

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

Spatial audio

Beyerdynamic AVENTHO 300Dolby Atmos with Dolby Head Tracking

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Wireless range

Beyerdynamic AVENTHO 300Up to 15 m

Sennheiser HD 820Not verified

Sources

Beyerdynamic AVENTHO 300

Manufacturer specification

beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25)

Sennheiser HD 820

No source recorded for this side.

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

Beyerdynamic AVENTHO 300

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 820

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

Beyerdynamic AVENTHO 300

What it brings

Supported codecs are AAC, aptX Lossless, aptX Adaptive and LE Audio, so a phone or computer that supports one of these can use it instead of a basic connection.
Manufacturer source Manufacturer source
A rated 50 hours with ANC on, 10-minute quick charging for 5 hours and a supplied hard case and 3.5 mm cable suit long trips.
Manufacturer source Manufacturer source

What to check

SBC is not in beyerdynamic's codec list, and the sources do not say whether the USB-C port can carry audio.
Manufacturer source Manufacturer source
beyerdynamic does not state the test conditions (source, volume) behind the 50-hour battery figure, so real runtime may differ.
Manufacturer source

Sennheiser HD 820

What it brings

Both an unbalanced 6.35 mm cable and a balanced 4.4 mm cable are supplied, each 3 m long, and an optional XLR-4 balanced cable is available for headphone amplifiers, DACs and other components.
Manufacturer source
Sennheiser attributes ambient-noise attenuation to the closed-back construction but publishes no attenuation figure.
Manufacturer source Manufacturer source
Sennheiser publishes 12–43,800 Hz at −3 dB and 6–48,000 Hz at −10 dB, 300-ohm impedance and 103 dB at 1 kHz, 1 V.
Manufacturer source Manufacturer source

What to check

Sennheiser states the distortion test two ways: below 0.02% at 1 kHz and 100 dB in the specification table, and 0.02% at 1 kHz, 1 Vrms in the feature list.
Manufacturer source
The supplied cables end in 6.35 mm and 4.4 mm plugs; no 3.5 mm plug or adapter is listed in the box, and the XLR-4 cable is optional.
Manufacturer source
The supplied cables are 3 m long, with 6.35 mm unbalanced and 4.4 mm balanced plugs.
Manufacturer source Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

23 of 23 specifications Sources in each row

Source-backed specifications for Beyerdynamic AVENTHO 300 and Sennheiser HD 820
Specification	Beyerdynamic AVENTHO 300	Sennheiser HD 820

Wearing styleDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Over-ear (circumaural), closed-back, foldable wireless headphones	Over-ear (circumaural), closed-back dynamic headphones
WeightDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification · Headphones without cable, per the product pages; the spec sheet gives 319 g without stating the basis. beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 BLACK — official North America store page and technical data beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification · Without the connection cable, per Sennheiser's UK store data ('360 g without cable'); the product-page table gives 360 g. Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	319 g	360 g
Acoustic design Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Closed-back	Closed-back

Wired / wireless connectionsDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification · The sources do not say whether the USB-C port carries audio; only charging is stated. beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification · Sennheiser's box list names only the 6.35 mm unbalanced and 4.4 mm balanced cables; no 3.5 mm plug or adapter is listed. Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Bluetooth 5.4 with multipoint (AAC, aptX Lossless, aptX Adaptive, LE Audio); USB-C charging port; supplied 3.5 mm mini-jack cable	Wired analogue; detachable 3 m cables with 6.35 mm unbalanced plug (fitted) and 4.4 mm balanced plug, both supplied; XLR-4 balanced cable optional
Battery life Sources Beyerdynamic AVENTHO 300 Manufacturer specification · beyerdynamic's rating with ANC switched on; test source and volume are not stated. Charging temperature range +10 to +40 °C. beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 The reviewed exact sources do not explicitly establish battery life or that no battery is required for operation. A wired/dynamic audio path, omitted charger or Battery included N is not an explicit operating-power requirement. · Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Up to 50 hours with ANC on; approx. 2 hours to charge; 10 minutes of quick charging gives 5 hours of playback	Not listed by the manufacturer
Bluetooth codecs Sources Beyerdynamic AVENTHO 300 Manufacturer specification · SBC is not listed in the official codec lists. beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	AAC, aptX Lossless, aptX Adaptive, LE Audio	Not provided
Bluetooth version and profiles Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	Bluetooth 5.4; A2DP 1.3.2, AVRCP 1.6.2, HFP 1.8, AVDTP 1.3, AVCTP 1.4, GAVDP 1.3, SPP-B 1.2, RFCOMM 1.2, IOPT	Not provided
Wireless range Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	Up to 15 m	Not provided
Charging Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	USB-C; USB-C to USB-C cable and USB-A to USB-C adapter supplied	Not provided
Cable length Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Not provided	3 m
Connectors Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Not provided	6.35 mm unbalanced (3-pin) and 4.4 mm balanced (5-pin) supplied; XLR-4 balanced (4-pin) cable optional

Driver constructionDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification · beyerdynamic's driver name; a diameter is not stated in the sources read. beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Dynamic STELLAR.45 drivers, angled	56 mm Ring Radiator dynamic transducer with concave Gorilla Glass reflectors
Rated frequency rangeDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 BLACK — official product page and technical data (global store)beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	5–22,000 Hz	12–43,800 Hz (−3 dB); 6–48,000 Hz (−10 dB)
Spatial audio Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	Dolby Atmos with Dolby Head Tracking	Not provided
Driver size Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Not provided	56 mm
Nominal impedance Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Not provided	300 ohm
Rated sensitivity Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification · Voltage reference (dB/V), not dB/mW. Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Not provided	103 dB SPL (1 kHz, 1 Vrms)
Rated total harmonic distortion Sources Beyerdynamic AVENTHO 300 No source recorded. Sennheiser HD 820 Manufacturer specification · From the product page's specification table; the same page's feature list states 'Total harmonic distortion: 0.02 % (1 kHz 1 Vrms)', a different test condition. Sennheiser HD 820 — official UK product page and specifications	Not provided	<0.02% (1 kHz, 100 dB SPL)

Microphone Sources Beyerdynamic AVENTHO 300 Manufacturer specification · Six digital MEMS microphones for calls and ANC. beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 The reviewed exact sources do not explicitly establish microphone absence. Omission from a package or technical inventory, a stereo audio connector, and a without-remote statement do not establish microphone=false. · Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Yes	Not listed by the manufacturer
Active noise cancellation Sources Beyerdynamic AVENTHO 300 Manufacturer specification · Adaptive hybrid ANC with a transparency mode. beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 The reviewed exact sources do not explicitly establish active noise cancellation absence. Preserve separately sourced acoustic design and passive attenuation; they cannot turn omitted ANC into a false capability. · Manufacturer specification Sennheiser HD 820 — official UK product page and specifications Sennheiser UK store — HD 820 product variant data (SKU and EAN)	Yes	Not listed by the manufacturer

Controls and app Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	Touch pad; beyerdynamic app with 5-band equaliser and over-the-air firmware updates; wear detection pauses and resumes playback	Not provided

In the boxDifferent Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 Manufacturer specification Sennheiser HD 820 — official UK product page and specifications	Headphones, USB-C to USB-C charging cable, USB-A to USB-C adapter, 3.5 mm mini-jack cable, drawstring bag, hard case, quick start guide, compliance booklet	Headphones, cable with 6.35 mm unbalanced plug (fitted), cable with 4.4 mm balanced plug, instruction manual, storage box, microfibre cloth

Operating temperature Sources Beyerdynamic AVENTHO 300 Manufacturer specification beyerdynamic AVENTHO 300 — spec sheet E2/AVENTHO 300 (03.25) Sennheiser HD 820 No source recorded.	-10 °C to +50 °C	Not provided

First product manufacturer source Second product manufacturer source

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Cable length: 2.5 m
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Prices & product profile

Sennheiser ACCENTUM Wireless

Wearing style: Over-ear (circumaural), closed-back wireless headphones
Wired / wireless connections: Bluetooth 5.2 (SBC, AAC, aptX HD); USB-C for charging, calls and streaming from a PC/Mac/mobile device
Microphone: Yes

Prices & product profile

Sennheiser MOMENTUM 5 Wireless

Wearing style: Over-ear (circumaural), closed-back wireless headphones with a fold-flat design
Dimensions: 180 x 197 x 47 mm (folded flat)
Wired / wireless connections: Bluetooth 5.4 (SBC, AAC, aptX, aptX HD, aptX Lossless, 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

Prices & product profile

Beyerdynamic MMX 230 wireless

Wearing style: Over-ear (circumaural), closed-back wireless gaming headset with boom microphone
Acoustic design: Closed-back
Wired / wireless connections: Wireless: Bluetooth 6.0 and a low-latency USB-C dongle; USB audio over USB-C; beyerdynamic also lists an analogue connection

Prices & product profile

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.