HEADPHONES · YOUR NEXT FACE-OFF

Sennheiser HD 660S2 vs Sennheiser HD 800 S

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

Compared products

YOUR FIRST CHOICE

Sennheiser HD 660S2

700240 · black with bronze accents · 300 ohm · 1.8 m balanced and unbalanced cables

Full product profile Official image

Exact model & source notes

The HD 660S2 is an open-back, over-ear headphone with a 38 mm dynamic driver rated 8–41,500 Hz (−10 dB) at 300 ohms. Sennheiser revised its acoustics for stronger sub-bass, and it ships with 1.8 m 6.35 mm unbalanced and 4.4 mm balanced cables plus a 3.5 mm adapter.

Specifications checked 11 Sept 2026.

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

Manufacturer specifications

WHAT DIFFERS

1.8 mIncluded cable length3 m

Rated contact pressureApproximately 6.0 N ±1.0 NApproximately 3.4 N ±0.3 N

4.5 mTStatic magnetic field at the surface10.5 mT

3 of 13 verified differences, in the order listed below. Not a rating.

See the 13 verified differences

THE CONTENDER

Sennheiser HD 800 S

Black · HD 800 S · 506911

Full product profile Official image

Exact model & source notes

The HD 800 S is an open-back, over-ear headphone built around a 56 mm ring-radiator driver with an acoustic absorber. It is rated 4–51,000 Hz (−10 dB) at 300 ohms and ships with detachable 3 m cables in both 6.35 mm unbalanced and 4.4 mm balanced form.

Specifications checked 11 Sept 2026.

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

Manufacturer specifications

HD 660S2 UK & US retailers

UK & US price history: no verified listing yet

HD 800 S 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 SIDE8 topics

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

SELECTED TOPIC

01 / 08

Cable length

Manufacturer-stated cable length. Check whether it is straight or coiled and whether the cable detaches; equal length does not mean an identical connection.

Sennheiser HD 660S21.8 m

Manufacturer specification · Length of the supplied cable.

Source 1

Sennheiser HD 800 S3 m

Manufacturer specification · Length of the supplied cable.

Source 1 Source 2

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 ↓

13 verified differences, most decision-relevant first. 1 is also drawn in Visual facts above. Missing information stays separate.

Wired / wireless connections

Sennheiser HD 660S2Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter

Sennheiser HD 800 SWired analogue; detachable 6.35 mm unbalanced and 4.4 mm balanced cables

Sources

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · The XLR-4 cable is an optional accessory. The manual describes using a standard 3.5 mm adapter, but its inclusion or exclusion is not explicitly established by the reviewed package list.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Driver construction

Sennheiser HD 660S238 mm open dynamic transducer; aluminium voice coil and vented magnet system

Sennheiser HD 800 S56 mm dynamic ring radiator; 40 mm voice coil; angled drivers, acoustic absorber, vibration-damping chassis and headband insert

Sources

Sennheiser HD 660S2

Manufacturer specification · Sennheiser lists 38 mm as the transducer size.

Sennheiser HD 660S2 — exact model specifications

Sennheiser HD 800 S

Manufacturer specification · The driver, diaphragm and voice-coil sizes describe different parts.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

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

Included and optional cables

Sennheiser HD 660S2Detachable 1.8 m unbalanced and 4.4 mm balanced cables included; XLR-4 cable optional

Sennheiser HD 800 SDetachable 3 m unbalanced and balanced cables included; XLR-4 cable optional

Sources

Sennheiser HD 660S2

Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Included cable length

In Visual facts

Sennheiser HD 660S21.8 m

Sennheiser HD 800 S3 m

Sources

Sennheiser HD 660S2

Manufacturer specification · Length of the supplied cable.

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Length of the supplied cable.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Supplied plug configuration

Sennheiser HD 660S26.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter

Sennheiser HD 800 S6.35 mm unbalanced cable and 4.4 mm balanced cable

Sources

Sennheiser HD 660S2

Manufacturer specification · The 4.4 mm balanced cable needs a balanced headphone output; an XLR-4 cable is optional.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Needs a matching headphone output; the 4.4 mm balanced cable needs a balanced output.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Rated contact pressure

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sennheiser HD 800 SApproximately 3.4 N ±0.3 N

Sources

Sennheiser HD 660S2

Manufacturer specification · Nominal clamping force; individual fit and comfort can differ.

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Nominal clamping force; individual fit and comfort can differ.

Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Show 7 more verified differences

Rated total harmonic distortion

Sennheiser HD 660S2≤0.04% at 1 kHz, 100 dB SPL

Sennheiser HD 800 S≤0.02% at 1 kHz, 1 V rms

Sources

Sennheiser HD 660S2

Manufacturer specification · Rated at 1 kHz and 100 dB SPL; other models use different test levels, so compare with care.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

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

Ear pads

Sennheiser HD 660S2Velour ear pads; replaceable

Sennheiser HD 800 SMicrofibre ear pads; replaceable

Sources

Sennheiser HD 660S2

Manufacturer specification · Replacement procedure shown in the manual.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Replacement procedure shown in the manual.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Rated frequency range

Sennheiser HD 660S28–41,500 Hz (−10 dB)

Sennheiser HD 800 S10–44,100 Hz (−3 dB); 4–51,000 Hz (−10 dB)

Sources

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · The manual gives both thresholds; the UK page lists only the wider range.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

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

Static magnetic field at the surface

Sennheiser HD 660S24.5 mT

Sennheiser HD 800 S10.5 mT

Sources

Sennheiser HD 660S2

Manufacturer specification · Static magnetic field at the headphone surface.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Static magnetic field at the headphone surface.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Rated sensitivity

Sennheiser HD 660S2104 dB SPL at 1 kHz, 1 V rms

Sennheiser HD 800 S102 dB SPL at 1 kHz, 1 V rms

Sources

Sennheiser HD 660S2

Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings.

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings.

Sennheiser HD 800 S — current instruction manual

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.

Replaceable parts

Sennheiser HD 660S2Detachable cable and replaceable ear pads

Sennheiser HD 800 SDetachable cables; replaceable ear pads, headband padding and washable 3D-mesh dust covers

Sources

Sennheiser HD 660S2

Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies.

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies.

Sennheiser HD 800 S — current instruction manual

Check the exact configuration and source conditions for your use.

Weight

Sennheiser HD 660S2260 g

Sennheiser HD 800 S330 g

Sources

Sennheiser HD 660S2

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 660S2 — operating guide and specifications

Sennheiser HD 800 S

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 800 S — current instruction manual

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

Missing or non-comparable evidence (7)

Active noise cancellation

Sennheiser HD 660S2Not verified

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

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 660S2 — operating guide and specifications

Sennheiser HD 800 S

The reviewed exact manufacturer sources establish open-back dynamic construction but do not explicitly state whether active noise cancellation is present or absent. Acoustic mesh, an absorber or an omitted ANC control does not establish ANC=false. · Manufacturer specification

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table

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

Microphone

In Visual facts

Sennheiser HD 660S2Not verified

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

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 660S2 — operating guide and specifications

Sennheiser HD 800 S

The reviewed exact manufacturer sources do not explicitly establish microphone presence or absence for the supplied configuration. Stereo audio conductors and omitted controls are not proof that no microphone exists. · Manufacturer specification

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table

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

Battery life

Sennheiser HD 660S2Not verified

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

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 660S2 — operating guide and specifications

Sennheiser HD 800 S

The reviewed exact manufacturer sources do not explicitly give battery life or state that no battery is required for operation. A wired analogue connection is known; the generic disposal wording “battery/rechargeable battery (if applicable)” establishes neither presence nor absence. · Manufacturer specification

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table

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

Published acoustic changes

Sennheiser HD 660S2Revised 300-ohm coil, more compliant surround, 70 Hz resonance and revised transducer airflow

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S.

Sennheiser HD 660S2 — exact model specifications

Sennheiser HD 800 S

No source recorded for this side.

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

Driver diameter

Sennheiser HD 660S2Not verified

Sennheiser HD 800 S56 mm

Sources

Sennheiser HD 660S2

No source recorded for this side.

Sennheiser HD 800 S

Manufacturer specification · Ring-radiator transducer diameter.

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

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

Supplied 3.5 mm adapter

Sennheiser HD 660S2Not verified

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

No source recorded for this side.

Sennheiser HD 800 S

The manual describes using a standard 3.5 mm adapter but does not explicitly say it is supplied or not supplied. It is absent from the reviewed package list; that omission is not a definitive exclusion. · Manufacturer specification

Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual

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

Manufacturer sub-bass claim

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sennheiser HD 800 SNot verified

Sources

Sennheiser HD 660S2

Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim.

Sennheiser HD 660S2 — exact model specifications

Sennheiser HD 800 S

No source recorded for this side.

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

6 shared fields have 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 660S2

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 800 S

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 660S2

What it brings

Both a 4.4 mm balanced and a 6.35 mm unbalanced cable are included with a 3.5 mm adapter, and the velour ear pads are replaceable.
Manufacturer source Manufacturer source
A revised 300-ohm voice coil, more compliant surround and vented magnet system are designed for more sub-bass, and sensitivity is rated at 104 dB SPL at 1 V.
Manufacturer source Manufacturer source

What to check

At 300 ohms with a rated 104 dB SPL at 1 kHz / 1 V rms, check that your amplifier or audio source can drive the headphones properly.
Manufacturer source Manufacturer source
The open-back design leaks sound and lets outside noise in, and the supplied cables are 1.8 m long. An XLR-4 cable is sold separately.
Manufacturer source Manufacturer source

Sennheiser HD 800 S

What it brings

Its 56 mm ring-radiator driver is rated 10–44,100 Hz (−3 dB) with total harmonic distortion of 0.02% or less at 1 kHz and 1 V rms, in a diffuse-field-equalised open design.
Manufacturer source Manufacturer source
Both a 6.35 mm unbalanced and a 4.4 mm balanced cable are included, and the ear pads, headband padding and dust covers can be replaced by the owner.
Manufacturer source Manufacturer source

What to check

At 300 ohms, check that your amplifier or audio source can drive the headphones properly. The documented connection uses the supplied analogue audio cables with 6.35 mm and 4.4 mm plugs.
Manufacturer source Manufacturer source
Sennheiser describes the intended use as listening at home with high-quality audio systems. A standard 3.5 mm adapter can be used, but the reviewed sources do not explicitly establish whether one is included.
Manufacturer source Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

26 of 26 specifications Sources in each row

Source-backed specifications for Sennheiser HD 660S2 and Sennheiser HD 800 S
Specification	Sennheiser HD 660S2	Sennheiser HD 800 S

Wearing style Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification Sennheiser HD 800 S — manufacturer specifications	Over-ear (circumaural), open-back dynamic headphones	Over-ear (circumaural), open-back dynamic headphones
WeightDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Approximate, without the cable. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Approximate, without the cable. Sennheiser HD 800 S — current instruction manual	260 g	330 g
Acoustic design Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification Sennheiser HD 800 S — manufacturer specifications	Open-back	Open-back
Replaceable partsDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 800 S — current instruction manual	Detachable cable and replaceable ear pads	Detachable cables; replaceable ear pads, headband padding and washable 3D-mesh dust covers
Ear padsDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	Velour ear pads; replaceable	Microfibre ear pads; replaceable
Rated contact pressureDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 800 S — current instruction manual	Approximately 6.0 N ±1.0 N	Approximately 3.4 N ±0.3 N

Wired / wireless connectionsDifferent Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · The XLR-4 cable is an optional accessory. The manual describes using a standard 3.5 mm adapter, but its inclusion or exclusion is not explicitly established by the reviewed package list. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter	Wired analogue; detachable 6.35 mm unbalanced and 4.4 mm balanced cables
Included cable lengthDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Length of the supplied cable. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Length of the supplied cable. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	1.8 m	3 m
Supplied plug configurationDifferent Sources Sennheiser HD 660S2 Manufacturer specification · The 4.4 mm balanced cable needs a balanced headphone output; an XLR-4 cable is optional. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Needs a matching headphone output; the 4.4 mm balanced cable needs a balanced output. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	6.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter	6.35 mm unbalanced cable and 4.4 mm balanced cable
Included and optional cablesDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	Detachable 1.8 m unbalanced and 4.4 mm balanced cables included; XLR-4 cable optional	Detachable 3 m unbalanced and balanced cables included; XLR-4 cable optional

Nominal impedance Sources Sennheiser HD 660S2 Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load. Sennheiser HD 800 S — manufacturer specifications	300 ohm	300 ohm
Rated frequency rangeDifferent Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · The manual gives both thresholds; the UK page lists only the wider range. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	8–41,500 Hz (−10 dB)	10–44,100 Hz (−3 dB); 4–51,000 Hz (−10 dB)
Rated sensitivityDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings. Sennheiser HD 800 S — current instruction manual	104 dB SPL at 1 kHz, 1 V rms	102 dB SPL at 1 kHz, 1 V rms
Driver constructionDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 800 S Manufacturer specification · The driver, diaphragm and voice-coil sizes describe different parts. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	38 mm open dynamic transducer; aluminium voice coil and vented magnet system	56 mm dynamic ring radiator; 40 mm voice coil; angled drivers, acoustic absorber, vibration-damping chassis and headband insert
Frequency equalisation Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification Sennheiser HD 800 S — current instruction manual	Diffuse-field equalised	Diffuse-field equalised
Rated total harmonic distortionDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Rated at 1 kHz and 100 dB SPL; other models use different test levels, so compare with care. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	≤0.04% at 1 kHz, 100 dB SPL	≤0.02% at 1 kHz, 1 V rms
Rated long-term input power Sources Sennheiser HD 660S2 Manufacturer specification · Rated to EN 60-268-7; the maximum input the headphones can handle, not the amplifier power they need. Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Maximum input the headphones can handle, not the amplifier power they need. Sennheiser HD 800 S — current instruction manual	Maximum 500 mW under EN 60-268-7	Maximum 500 mW under EN 60-268-7
Published acoustic changes Sources Sennheiser HD 660S2 Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 800 S No source recorded.	Revised 300-ohm coil, more compliant surround, 70 Hz resonance and revised transducer airflow	Not provided
Manufacturer sub-bass claim Sources Sennheiser HD 660S2 Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 800 S No source recorded.	Double the sound pressure at the lowest frequencies	Not provided
Driver diameter Sources Sennheiser HD 660S2 No source recorded. Sennheiser HD 800 S Manufacturer specification · Ring-radiator transducer diameter. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	Not provided	56 mm

Static magnetic field at the surfaceDifferent Sources Sennheiser HD 660S2 Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	4.5 mT	10.5 mT
Operating temperature Sources Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications Sennheiser HD 800 S Manufacturer specification · Storage −20 °C to +70 °C; relative humidity 10–80% operating and 10–90% storage, non-condensing. Sennheiser HD 800 S — current instruction manual	−10 °C to +55 °C	−10 °C to +55 °C

Show unverified (4)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Microphone Sources Sennheiser HD 660S2 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 660S2 — operating guide and specifications Sennheiser HD 800 S The reviewed exact manufacturer sources do not explicitly establish microphone presence or absence for the supplied configuration. Stereo audio conductors and omitted controls are not proof that no microphone exists. · Manufacturer specification Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table	Not listed by the manufacturer	Not listed by the manufacturer
Active noise cancellation Sources Sennheiser HD 660S2 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 660S2 — operating guide and specifications Sennheiser HD 800 S The reviewed exact manufacturer sources establish open-back dynamic construction but do not explicitly state whether active noise cancellation is present or absent. Acoustic mesh, an absorber or an omitted ANC control does not establish ANC=false. · Manufacturer specification Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table	Not listed by the manufacturer	Not listed by the manufacturer
Battery life Sources Sennheiser HD 660S2 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 660S2 — operating guide and specifications Sennheiser HD 800 S The reviewed exact manufacturer sources do not explicitly give battery life or state that no battery is required for operation. A wired analogue connection is known; the generic disposal wording “battery/rechargeable battery (if applicable)” establishes neither presence nor absence. · Manufacturer specification Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual Sennheiser HD 800 S — manufacturer specification table	Not listed by the manufacturer	Not listed by the manufacturer
Supplied 3.5 mm adapter Sources Sennheiser HD 660S2 No source recorded. Sennheiser HD 800 S The manual describes using a standard 3.5 mm adapter but does not explicitly say it is supplied or not supplied. It is absent from the reviewed package list; that omission is not a definitive exclusion. · Manufacturer specification Sennheiser HD 800 S — manufacturer specifications Sennheiser HD 800 S — current instruction manual	Not provided	Not listed by the manufacturer

First product manufacturer source Second product manufacturer source

FIND YOUR CONTENDERS

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

See all 213 headphones

Sennheiser HD 650

Impedance: 300 Ω
Cable length: 3 m
Wearing style: Over-ear (circumaural), open-back dynamic headphones

Prices & product profile

Sennheiser HD 600

Impedance: 300 Ω
Cable length: 3 m
Wearing style: Over-ear (circumaural), open-back dynamic headphones

Prices & product profile

Beyerdynamic DT 990 PRO 250 ohm

Impedance: 250 Ω
Cable length: 3 m
Wearing style: Over-ear (circumaural), open-back wired studio headphones

Prices & product profile

Sennheiser HD 550

Impedance: 150 Ω
Cable length: 1.8 m
Wearing style: Over-ear, open-back dynamic headphones

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.