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HEADPHONES · YOUR NEXT FACE-OFF

Sennheiser HD 820 vs HyperX Cloud III

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

Compared products

YOUR FIRST CHOICE

Sennheiser HD 820

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

Sennheiser HD 820 closed-back over-ear headphones in black with glass ear-cup covers, three-quarter view
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
WHICH SUITS YOU?

Choose the Sennheiser HD 820 for

  • Higher stated nominal impedance: 300 ohm vs 64 ohm

Choose the HyperX Cloud III for

  • Lower stated nominal impedance: 64 ohm vs 300 ohm
Built from verified specifications that differ. Not a rating or a recommendation.
See the 9 verified differences
THE CONTENDER

HyperX Cloud III

727A8AA · Black · wired

HyperX Cloud III wired gaming headset in black with detachable microphone
Full product profile Official image
Exact model & source notes

The HyperX Cloud III (SKU 727A8AA, black) is a closed-back, over-ear wired gaming headset with angled 53 mm drivers, a full metal (aluminium) frame, ear-cup volume and mic-mute controls, a detachable 10 mm noise-cancelling microphone and a USB dongle alongside its 3.5 mm connection. HyperX lists it for PC, PlayStation, Xbox, Switch, Mac and mobile.

Specifications checked 26 Sept 2026.

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

Manufacturer specifications

Sennheiser HD 820 UK & US retailers

UK
Search Amazon UKSearch eBay UK
US
Search Amazon USSearch eBay US

UK & US price history: no verified listing yet

HyperX Cloud III UK & US retailers

UK
Search Amazon UKSearch eBay UK
US
Search Amazon USSearch eBay US

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.

HyperX Cloud III64 Ω

Manufacturer specification · Listed on the UK page only; the US page omits impedance.

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 ↓

9 verified differences, most decision-relevant first. 1 is also drawn in Visual facts above. 1 feature is the same under different published names, grouped below. Missing information stays separate.

Wired / wireless connections

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
HyperX Cloud IIIWired: 3.5 mm, plus a USB dongle for USB-C, and USB-A via the supplied adapter
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)

Check the exact configuration and source conditions for your use.

Nominal impedance

In Visual facts
Sennheiser HD 820300 ohm
HyperX Cloud III64 ohm
Sources
HyperX Cloud III

Manufacturer specification · Listed on the UK page only; the US page omits impedance.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications

Check the exact configuration and source conditions for your use.

Driver construction

Sennheiser HD 82056 mm Ring Radiator dynamic transducer with concave Gorilla Glass reflectors
HyperX Cloud IIIDynamic, 53 mm with neodymium magnets (angled)
Sources

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

Rated total harmonic distortion

Sennheiser HD 820<0.02% (1 kHz, 100 dB SPL)
HyperX Cloud III<2%
Sources
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

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 82012–43,800 Hz (−3 dB); 6–48,000 Hz (−10 dB)
HyperX Cloud III10 Hz – 21 kHz
Sources

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

Show 3 more verified differences

In the box

Sennheiser HD 820Headphones, cable with 6.35 mm unbalanced plug (fitted), cable with 4.4 mm balanced plug, instruction manual, storage box, microfibre cloth
HyperX Cloud IIIHeadset, detachable microphone, USB dongle, USB-C to USB-A adapter, quick start guide
Sources

Check the exact configuration and source conditions for your use.

Rated sensitivity

Sennheiser HD 820103 dB SPL (1 kHz, 1 Vrms)
HyperX Cloud III100 dB SPL/mW at 1 kHz
Sources

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.

Weight

Sennheiser HD 820360 g
HyperX Cloud III308 g
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)
HyperX Cloud III

Manufacturer specification · Without microphone; 320 g with the microphone attached (UK page). The US page lists 0.67 lb / 0.70 lb.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specificationsHyperX Cloud III – Gaming Headset — official HyperX US product page and technical specifications

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

Same feature, different names (1)

The sources publish different names for the same feature. Both names and their sources are shown; they are not counted as differences.

Wearing style

Sennheiser HD 820Over-ear (circumaural), closed-back dynamic headphones
HyperX Cloud IIIOver-ear (circumaural), closed-back wired gaming headset
Sources

Both sources state the same feature under different published names. This is not a verified difference; check the exact feature you need.

Missing or non-comparable evidence (11)

Active noise cancellation

Sennheiser HD 820Not verified
HyperX Cloud IIINot verified
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)
HyperX Cloud III

The reviewed exact sources do not explicitly establish active noise cancellation presence or absence for listening. Preserve separately documented microphone noise reduction, closed construction or passive attenuation; none negates active ANC. · Manufacturer specification

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications

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

Microphone

In Visual facts
Sennheiser HD 820Not verified
HyperX Cloud IIIYes
Sources
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
HyperX Cloud III

Manufacturer specification · Detachable 10 mm electret condenser microphone, unidirectional, noise-cancelling, with LED mute indicator.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications

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

Battery life

Sennheiser HD 820Not verified
HyperX Cloud IIINot verified
Sources
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
HyperX Cloud III

The reviewed exact sources do not explicitly establish battery life or a whole-device no-battery operating requirement. A wired connection, omitted charger or Battery included N does not establish not-required. · Manufacturer specification

HyperX Cloud III – Gaming Headset — official HyperX 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.

YOUR CHOICE

Sennheiser HD 820

Select a feature to check your fit.

YOUR CHOICE

HyperX Cloud III

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 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

HyperX Cloud III

What it brings

  • One headset covers 3.5 mm, USB-C and USB-A: the 3.5 mm plug suits devices with a headphone jack, and the supplied USB dongle and adapter cover USB-C and USB-A ports.
    Manufacturer source
  • HyperX lists compatibility with PC, PS5, PS4, Xbox Series X|S, Xbox One, Nintendo Switch, Mac and mobile.
    Manufacturer source

What to check

  • The documented audio connections are 3.5 mm and the supplied USB dongle. The “noise-cancelling” label applies to the microphone; active noise cancellation for listening remains unestablished.
    Manufacturer source
  • HyperX lists 308 g without the microphone and 320 g with it, and publishes cable lengths only in feet on its US page.
    Manufacturer source Manufacturer source
COMPARE THE DETAILS

Full specifications

How we verify
22 of 22 specifications Sources in each row
Source-backed specifications for Sennheiser HD 820 and HyperX Cloud III
SpecificationSennheiser HD 820HyperX Cloud III
Wearing style
Sources
Over-ear (circumaural), closed-back dynamic headphonesOver-ear (circumaural), closed-back wired gaming headset
WeightDifferent
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)
HyperX Cloud III

Manufacturer specification · Without microphone; 320 g with the microphone attached (UK page). The US page lists 0.67 lb / 0.70 lb.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specificationsHyperX Cloud III – Gaming Headset — official HyperX US product page and technical specifications
360 g308 g
Acoustic design
Sources
Closed-backClosed-back
Ear cushions
Sources
Sennheiser HD 820

No source recorded.

Not providedMemory foam with premium leatherette
Frame materials
Sources
Sennheiser HD 820

No source recorded.

Not providedFull metal frame (aluminium)
Wired / wireless connectionsDifferent
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)
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 optionalWired: 3.5 mm, plus a USB dongle for USB-C, and USB-A via the supplied adapter
Cable length
Sources
HyperX Cloud III

No source recorded.

3 mNot provided
Connectors
Sources
HyperX Cloud III

No source recorded.

6.35 mm unbalanced (3-pin) and 4.4 mm balanced (5-pin) supplied; XLR-4 balanced (4-pin) cable optionalNot provided
Supplied cables
Sources
Sennheiser HD 820

No source recorded.

HyperX Cloud III

Manufacturer specification · HyperX lists imperial lengths only.

HyperX Cloud III – Gaming Headset — official HyperX US product page and technical specifications
Not providedHeadset cable 3.93 ft; USB dongle cable 4.26 ft
Compatibility
Sources
Sennheiser HD 820

No source recorded.

Not providedPC, PS5, PS4, Xbox Series X|S, Xbox One, Nintendo Switch, Mac, mobile
Driver constructionDifferent
Sources
56 mm Ring Radiator dynamic transducer with concave Gorilla Glass reflectorsDynamic, 53 mm with neodymium magnets (angled)
Driver sizeDifferent
Sources
56 mm53 mm
Rated frequency rangeDifferent
Sources
12–43,800 Hz (−3 dB); 6–48,000 Hz (−10 dB)10 Hz – 21 kHz
Nominal impedanceDifferent
Sources
HyperX Cloud III

Manufacturer specification · Listed on the UK page only; the US page omits impedance.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications
300 ohm64 ohm
Rated sensitivityDifferent
Sources
103 dB SPL (1 kHz, 1 Vrms)100 dB SPL/mW at 1 kHz
Rated total harmonic distortionDifferent
Sources
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
<0.02% (1 kHz, 100 dB SPL)<2%
Microphone
Sources
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
HyperX Cloud III

Manufacturer specification · Detachable 10 mm electret condenser microphone, unidirectional, noise-cancelling, with LED mute indicator.

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications
Not listed by the manufacturerYes
Microphone
Sources
Sennheiser HD 820

No source recorded.

Not providedDetachable electret condenser, unidirectional, noise-cancelling; −42 dBV (0 dB = 1 V/Pa at 1 kHz)
Controls
Sources
Sennheiser HD 820

No source recorded.

Not providedOnboard ear-cup controls for headphone volume and microphone mute
In the boxDifferent
Sources
Headphones, cable with 6.35 mm unbalanced plug (fitted), cable with 4.4 mm balanced plug, instruction manual, storage box, microfibre clothHeadset, detachable microphone, USB dongle, USB-C to USB-A adapter, quick start guide
Show unverified (2)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.
Specifications without verified values for either product
Active noise cancellation
Sources
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 specificationsSennheiser UK store — HD 820 product variant data (SKU and EAN)
HyperX Cloud III

The reviewed exact sources do not explicitly establish active noise cancellation presence or absence for listening. Preserve separately documented microphone noise reduction, closed construction or passive attenuation; none negates active ANC. · Manufacturer specification

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications
Not listed by the manufacturerNot listed by the manufacturer
Battery life
Sources
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
HyperX Cloud III

The reviewed exact sources do not explicitly establish battery life or a whole-device no-battery operating requirement. A wired connection, omitted charger or Battery included N does not establish not-required. · Manufacturer specification

HyperX Cloud III – Gaming Headset — official HyperX UK product page and specifications
Not listed by the manufacturerNot listed by the manufacturer
First product manufacturer sourceSecond product manufacturer source
FIND YOUR CONTENDERS

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Closest headphones to this pair by shared key specifications. Not a popularity ranking.

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Impedance
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Cable length
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Wearing style
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Impedance
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Wearing style
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Wired / wireless connections
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Impedance
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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.