HEADPHONES · YOUR NEXT FACE-OFF

Sennheiser HD 560S vs Sennheiser HD 660S2

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

Compared products

YOUR FIRST CHOICE

Sennheiser HD 560S

509144 · Black · wired

Full product profile Official image

Exact model & source notes

The HD 560S (article 509144) is Sennheiser's open-back over-ear headphone with angled 120-ohm dynamic transducers, velour ear pads, a detachable cable and a 110 dB at 1 V rating, weighing 240 g without the cable; Sennheiser's own pages disagree on which end of the supplied plug and adapter pair is the plug and on the cable length.

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 560S for

Lower stated nominal impedance: 120 ohm vs 300 ohm

Choose the 660S2 for

Higher stated nominal impedance: 300 ohm vs 120 ohm

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

See the 8 verified differences

THE CONTENDER

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

560S UK & US retailers

UK & US price history: no verified listing yet

660S2 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 560S120 Ω

Source 1 Source 2 Source 3

Sennheiser HD 660S2300 Ω

Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load.

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 ↓

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

Wired / wireless connections

Sennheiser HD 560SWired analogue; detachable cable with a 3.5 mm and 6.3 mm plug/adapter pair (which end is the plug conflicts across Sennheiser's sources)

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

Sources

Sennheiser HD 560S

Manufacturer specification · See the supplied plug configuration and cable length entries for the conflicting official descriptions. The US store sells an optional 4.4 mm balanced cable listed for the HD 560 S; it is not included.

Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)

Sennheiser HD 660S2

Manufacturer specification

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

Check the exact configuration and source conditions for your use.

Nominal impedance

In Visual facts

Sennheiser HD 560S120 ohm

Sennheiser HD 660S2300 ohm

Sources

Sennheiser HD 560S

Manufacturer specification

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

Check the exact configuration and source conditions for your use.

Driver construction

Sennheiser HD 560SDynamic transducers with polymer-blend membrane, angled (E.A.R.) alignment

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

Sources

Sennheiser HD 560S

Manufacturer specification

Sennheiser HD 560S — official UK product page and specifications

Sennheiser HD 660S2

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

Sennheiser HD 660S2 — exact model specifications

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 560S<0.05% (1 kHz / 90 dB SPL)

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

Sources

Sennheiser HD 560S

Manufacturer specification · Rated at 1 kHz and 90 dB SPL; other models use different test levels, so compare with care.

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

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 560SVelour

Sennheiser HD 660S2Velour ear pads; replaceable

Sources

Sennheiser HD 560S

Manufacturer specification

Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)

Sennheiser HD 660S2

Manufacturer specification · Replacement procedure shown in the manual.

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

Check the exact configuration and source conditions for your use.

Rated frequency range

Sennheiser HD 560S6 Hz – 38 kHz (−10 dB)

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

Sources

Sennheiser HD 560S

Manufacturer specification · The −10 dB limit is from Sennheiser's UK store product data; the product-page tables give 6 Hz - 38,000 Hz without a tolerance.

Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

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

Show 2 more verified differences

Rated sensitivity

Sennheiser HD 560S110 dB SPL (1 kHz, 1 Vrms)

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

Sources

Sennheiser HD 560S

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

Sennheiser HD 560S — official UK product page and specifications

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

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 560S240 g

Sennheiser HD 660S2260 g

Sources

Sennheiser HD 560S

Manufacturer specification · Without the cable, from Sennheiser's UK store product data ('Weight w/o cable 240 g'). The UK and US product-page tables give 280 g without stating whether the cable is included; no cable mass is inferred from the difference.

Sennheiser HD 660S2

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 660S2 — operating guide and specifications

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

Missing or non-comparable evidence (16)

Active noise cancellation

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Not verified

Sources

Sennheiser HD 560S

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 560S — official UK product page and specifications

Sennheiser HD 660S2

Sennheiser HD 660S2 — operating guide and specifications

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

Microphone

In Visual facts

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Not verified

Sources

Sennheiser HD 560S

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 560S — official UK product page and specifications

Sennheiser HD 660S2

Sennheiser HD 660S2 — operating guide and specifications

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

Battery life

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Not verified

Sources

Sennheiser HD 560S

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 560S — official UK product page and specifications

Sennheiser HD 660S2

Sennheiser HD 660S2 — operating guide and specifications

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

Published acoustic changes

Sennheiser HD 560SNot verified

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

Sources

Sennheiser HD 560S

No source recorded for this side.

Sennheiser HD 660S2

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

Sennheiser HD 660S2 — exact model specifications

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

Included and optional cables

Sennheiser HD 560SNot verified

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

Sources

Sennheiser HD 560S

No source recorded for this side.

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

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

Cable length

Sennheiser HD 560SConflicting evidence

Sennheiser HD 660S21.8 m

Sources

Sennheiser HD 560S

The UK and US product pages, their box lists and the UK store description give a 1.8 m (1.80 m) detachable cable, while the US store product description says 'A detachable 3 meter cable'. Check the listing for the supplied cable length. · Manufacturer specification

Sennheiser HD 660S2

Manufacturer specification · Length of the supplied cable.

Sennheiser HD 660S2 — operating guide and specifications

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

Supplied plug configuration

Sennheiser HD 560SConflicting evidence

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

Sources

Sennheiser HD 560S

Sennheiser's UK product page (box list and feature copy) describes a 3.5 mm plug with a 3.5-to-6.3 mm screw-on adapter, while the UK store product data lists 'Jack plug 6.35 mm with 3.5 mm adapter' and both UK and US store descriptions say the cable 'features a 6.3mm plug with a flexible 3.5mm adapter'. Check the listing for the supplied plug. · Manufacturer specification

Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)Sennheiser US store — HD 560S product variant data (SKU and UPC)

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

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

Rated contact pressure

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sources

Sennheiser HD 560S

No source recorded for this side.

Sennheiser HD 660S2

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

Sennheiser HD 660S2 — operating guide and specifications

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

Wearing style

Sennheiser HD 560SOver-ear, open-back dynamic headphones

Sennheiser HD 660S2Over-ear (circumaural), open-back dynamic headphones

Sources

Sennheiser HD 560S

Manufacturer specification

Sennheiser HD 560S — official UK product page and specifications

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

One source states less detail or a rounded figure. This is not a verified difference; check the exact configuration.

Frequency equalisation

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Diffuse-field equalised

Sources

Sennheiser HD 560S

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

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

Sennheiser HD 560SNot verified

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sources

Sennheiser HD 560S

No source recorded for this side.

Sennheiser HD 660S2

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

Sennheiser HD 660S2 — exact model 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 560S

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 660S2

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 560S

What it brings

The angled (E.A.R.) transducers and open-back cups are designed to place sound in front of the listener, similar to a loudspeaker setup.
Manufacturer source
Sennheiser publishes the 120-ohm impedance, a 110 dB at 1 kHz / 1 V rating and <0.05% distortion at 90 dB SPL, which helps judge whether a phone, computer or amplifier output is sufficient.
Manufacturer source Manufacturer source
The cable is detachable, and every official description pairs a 3.5 mm connection with a 6.3 mm one, so both portable devices and hi-fi headphone sockets are covered.
Manufacturer source Manufacturer source

What to check

Sennheiser says the open-back design provides natural propagation of sound waves, but its page gives no noise-isolation or sound-leakage figure.
Manufacturer source
Sennheiser's sources disagree on whether the supplied cable ends in a 3.5 mm plug with a 6.3 mm adapter or the reverse, and the US store description gives a 3 m cable against 1.8 m elsewhere, so check the listing.
Manufacturer source Manufacturer source Manufacturer source
The supplied connection uses 3.5 mm and 6.3 mm audio connectors; Sennheiser’s sources disagree on the cable length and which connector is the plug or adapter.
Manufacturer source Manufacturer source Manufacturer source Manufacturer source

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

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

25 of 25 specifications Sources in each row

Source-backed specifications for Sennheiser HD 560S and Sennheiser HD 660S2
Specification	Sennheiser HD 560S	Sennheiser HD 660S2

Wearing style Sources Sennheiser HD 560S Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Over-ear, open-back dynamic headphones	Over-ear (circumaural), open-back dynamic headphones
WeightDifferent Sources Sennheiser HD 560S Manufacturer specification · Without the cable, from Sennheiser's UK store product data ('Weight w/o cable 240 g'). The UK and US product-page tables give 280 g without stating whether the cable is included; no cable mass is inferred from the difference. Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) Sennheiser HD 660S2 Manufacturer specification · Approximate, without the cable. Sennheiser HD 660S2 — operating guide and specifications	240 g	260 g
Acoustic design Sources Sennheiser HD 560S Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Open-back	Open-back
Ear padsDifferent Sources Sennheiser HD 560S Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) Sennheiser HD 660S2 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Velour	Velour ear pads; replaceable
Replaceable parts Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 660S2 — operating guide and specifications	Not provided	Detachable cable and replaceable ear pads
Rated contact pressure Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 660S2 — operating guide and specifications	Not provided	Approximately 6.0 N ±1.0 N

Wired / wireless connectionsDifferent Sources Sennheiser HD 560S Manufacturer specification · See the supplied plug configuration and cable length entries for the conflicting official descriptions. The US store sells an optional 4.4 mm balanced cable listed for the HD 560 S; it is not included. Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Wired analogue; detachable cable with a 3.5 mm and 6.3 mm plug/adapter pair (which end is the plug conflicts across Sennheiser's sources)	Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter
Supplied plug configuration Sources Sennheiser HD 560S Sennheiser's UK product page (box list and feature copy) describes a 3.5 mm plug with a 3.5-to-6.3 mm screw-on adapter, while the UK store product data lists 'Jack plug 6.35 mm with 3.5 mm adapter' and both UK and US store descriptions say the cable 'features a 6.3mm plug with a flexible 3.5mm adapter'. Check the listing for the supplied plug. · Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)Sennheiser US store — HD 560S product variant data (SKU and UPC) 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	Conflicting sources	6.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter
Cable length Sources Sennheiser HD 560S The UK and US product pages, their box lists and the UK store description give a 1.8 m (1.80 m) detachable cable, while the US store product description says 'A detachable 3 meter cable'. Check the listing for the supplied cable length. · Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN)Sennheiser US store — HD 560S product variant data (SKU and UPC) Sennheiser HD 660S2 Manufacturer specification · Length of the supplied cable. Sennheiser HD 660S2 — operating guide and specifications	Conflicting sources	1.8 m
Included and optional cables Sources Sennheiser HD 560S No source recorded. 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	Not provided	Detachable 1.8 m unbalanced and 4.4 mm balanced cables included; XLR-4 cable optional

Driver constructionDifferent Sources Sennheiser HD 560S Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications	Dynamic transducers with polymer-blend membrane, angled (E.A.R.) alignment	38 mm open dynamic transducer; aluminium voice coil and vented magnet system
Rated frequency rangeDifferent Sources Sennheiser HD 560S Manufacturer specification · The −10 dB limit is from Sennheiser's UK store product data; the product-page tables give 6 Hz - 38,000 Hz without a tolerance. Sennheiser HD 560S — official UK product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	6 Hz – 38 kHz (−10 dB)	8–41,500 Hz (−10 dB)
Nominal impedanceDifferent Sources Sennheiser HD 560S Manufacturer specification Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) 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	120 ohm	300 ohm
Rated sensitivityDifferent Sources Sennheiser HD 560S Manufacturer specification · Voltage reference (dB/V), not dB/mW. Sennheiser HD 560S — official UK product page and specifications 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	110 dB SPL (1 kHz, 1 Vrms)	104 dB SPL at 1 kHz, 1 V rms
Rated total harmonic distortionDifferent Sources Sennheiser HD 560S Manufacturer specification · Rated at 1 kHz and 90 dB SPL; other models use different test levels, so compare with care. Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) 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	<0.05% (1 kHz / 90 dB SPL)	≤0.04% at 1 kHz, 100 dB SPL
Frequency equalisation Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Diffuse-field equalised
Rated long-term input power Sources Sennheiser HD 560S No source recorded. 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	Not provided	Maximum 500 mW under EN 60-268-7
Published acoustic changes Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S. Sennheiser HD 660S2 — exact model specifications	Not provided	Revised 300-ohm coil, more compliant surround, 70 Hz resonance and revised transducer airflow
Manufacturer sub-bass claim Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim. Sennheiser HD 660S2 — exact model specifications	Not provided	Double the sound pressure at the lowest frequencies

In the box Sources Sennheiser HD 560S Manufacturer specification · The US page additionally lists a drawstring storage bag and describes the adapter as screw-on; the UK page does not list a bag. Sennheiser's store product data describes the plug the other way round (6.35 mm plug with 3.5 mm adapter). Sennheiser HD 560S — official UK product page and specifications Sennheiser HD 560S — official US product page and specifications Sennheiser UK store — HD 560S product variant data (SKU and EAN) Sennheiser HD 660S2 No source recorded.	Headphones, 1.8 m cable with 3.5 mm plug, 3.5-to-6.3 mm adapter	Not provided

Static magnetic field at the surface Sources Sennheiser HD 560S No source recorded. 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	Not provided	4.5 mT
Operating temperature Sources Sennheiser HD 560S No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	−10 °C to +55 °C

Show unverified (3)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 560S 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 560S — official UK product page and specifications 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	Not listed by the manufacturer	Not listed by the manufacturer
Active noise cancellation Sources Sennheiser HD 560S 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 560S — official UK product page and specifications 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	Not listed by the manufacturer	Not listed by the manufacturer
Battery life Sources Sennheiser HD 560S 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 560S — official UK product page and specifications 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	Not listed by the manufacturer	Not listed by the manufacturer

First product manufacturer source Second product manufacturer source

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Impedance: 120 Ω
Cable length: 1.8 m
Wearing style: Over-ear (circumaural), open-back dynamic headphones

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Cable length: 1.8 m
Wearing style: Over-ear (circumaural), open-back wired studio headphones

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Impedance: 130 Ω
Cable length: 1.8 m
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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.