HEADPHONES · YOUR NEXT FACE-OFF

Nothing Ear (3) vs Sennheiser HD 660S2

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

Compared products

YOUR FIRST CHOICE

Nothing Ear (3)

6974434226791 · White · UK

Full product profile Official image

Exact model & source notes

Nothing Ear (3) (store SKU 6974434226791 in White, the same SKU on the UK and US stores) are stem-style true wireless earbuds with real-time adaptive ANC up to 45 dB, Bluetooth 5.4 with LDAC and dual connection, and an aluminium-based case that adds a separate 'Super Mic' for calls and voice notes.

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 Nothing Ear (3) for

A wireless connection

Choose the Sennheiser HD 660S2 for

A wired connection

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

See the 4 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

Nothing Ear (3) UK & US retailers

UK & US price history: no verified listing yet

Sennheiser HD 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 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.

Nothing Ear (3)Not verified

Sennheiser HD 660S2Yes

Open-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 ↓

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

Wired / wireless connections

Nothing Ear (3)Bluetooth 5.4 (AAC, SBC, LDAC) with dual connection; USB-C and wireless charging on the case

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

Nothing Ear (3)

Manufacturer specification · Charging to full takes 70 minutes over USB-C or 120 minutes wirelessly, per Nothing.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

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.

Drivers

Nothing Ear (3)12 mm dynamic driver, 32 Ω, PMI + TPU diaphragm

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

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical 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.

Wearing style

Nothing Ear (3)In-ear, true wireless (stem earbuds with silicone ear tips)

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

Sources

Nothing Ear (3)

Manufacturer specification · Two earbuds and a charging case; three pairs of ear tips are in the box.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Frequency response

Nothing Ear (3)20 Hz – 40 kHz

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

Sources

Nothing Ear (3)

Manufacturer specification · Listed as 'RF' under Sound in Nothing's specification table.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

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.

Missing or non-comparable evidence (32)

Acoustic design

Nothing Ear (3)Not verified

Sennheiser HD 660S2Open-back

Sources

Nothing Ear (3)

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.

Active noise cancellation

Nothing Ear (3)Yes

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Real-time adaptive ANC up to 45 dB (Nothing's laboratory theoretical maximum) with a Transparency mode.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical 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

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

Microphone

In Visual facts

Nothing Ear (3)Yes

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Three MEMS microphones per earbud plus a voice pickup unit (VPU) per earbud; the charging case also contains a dual-microphone 'Super Mic' activated with its Talk button.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical 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

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

Battery life

Nothing Ear (3)AAC: earbuds up to 5.5 hours with ANC on and up to 10 hours with ANC off; with the charging case up to 22 hours with ANC on and up to 38 hours with ANC off. LDAC: earbuds up to 3.5 hours with ANC on and 5.5 hours with ANC off (no case total given for LDAC).

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with volume, calls, source and features. Talk time is separately listed (earbuds 4 h ANC on / 5 h ANC off; with case 15.5 h / 19 h).

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical 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

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

Nominal impedance

Nothing Ear (3)Not verified

Sennheiser HD 660S2300 ohm

Sources

Nothing Ear (3)

No source recorded for this side.

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

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

Published acoustic changes

Nothing Ear (3)Not verified

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

Sources

Nothing Ear (3)

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.

Companion app

Nothing Ear (3)Nothing X app: custom EQ with profile sharing (8-band equaliser), Personal Sound profile (Audiodo), Dynamic Bass Enhancement, customisable controls, find my earbuds, dual connection, ear tips fit test and firmware updates

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Nothing X is for Android 6.0 and above and iOS 13 and above; on Nothing OS 1.5.6 and higher the settings are built into the phone.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Battery capacity

Nothing Ear (3)Earbuds 55 mAh each; case 500 mAh

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Included and optional cables

Nothing Ear (3)Not verified

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

Sources

Nothing Ear (3)

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.

Included cable length

Nothing Ear (3)Not verified

Sennheiser HD 660S21.8 m

Sources

Nothing Ear (3)

No source recorded for this side.

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.

Bluetooth codecs

Nothing Ear (3)AAC, SBC, LDAC (Hi-Res certified)

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Supplied plug configuration

Nothing Ear (3)Not verified

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

Sources

Nothing Ear (3)

No source recorded for this side.

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

Nothing Ear (3)Not verified

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sources

Nothing Ear (3)

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.

Controls

Nothing Ear (3)Pinch sensor on each earbud: pinch for play/pause and answer/end call; double pinch for next track or reject call; triple pinch for previous track; hold for noise cancellation/transparency; pinch and hold for volume up/down. Case Talk button: press and hold during a call to use Super Mic, double press to lock it in; outside calls, press and hold for Essential Space (Nothing OS) or the voice assistant (iOS/Android).

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Next/previous track, noise cancellation/transparency, volume and the Talk button's non-call actions are marked customisable in the Nothing X app. Essential Space is available only on select Nothing devices with the Essential Key.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

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

Nothing Ear (3)Not verified

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

Sources

Nothing Ear (3)

No source recorded for this side.

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

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

Ear pads

Nothing Ear (3)Not verified

Sennheiser HD 660S2Velour ear pads; replaceable

Sources

Nothing Ear (3)

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Replacement procedure shown in the manual.

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.

Quick pairing

Nothing Ear (3)Google Fast Pair and Microsoft Swift Pair

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Fast Pair works on supported Android devices running Google Play services 11.7+ (back to Android 6.0); Find My and device renaming support need Android 10 or later.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Frequency equalisation

Nothing Ear (3)Not verified

Sennheiser HD 660S2Diffuse-field equalised

Sources

Nothing Ear (3)

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.

In-ear detection

Nothing Ear (3)Yes

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Rated long-term input power

Nothing Ear (3)Not verified

Sennheiser HD 660S2Maximum 500 mW under EN 60-268-7

Sources

Nothing Ear (3)

No source recorded for this side.

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

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

Low Lag Mode

Nothing Ear (3)Low Lag Mode (latency as low as 110 ms)

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Latency can be reduced to as low as 110 ms only when the earbuds are paired with Nothing phones with Game Mode turned on (footnote 3).

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Static magnetic field at the surface

Nothing Ear (3)Not verified

Sennheiser HD 660S24.5 mT

Sources

Nothing Ear (3)

No source recorded for this side.

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

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

Multipoint (dual connection)

Nothing Ear (3)Yes

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Nothing notes that turning Dual Connection on affects Super Mic functionality; Super Mic is prioritised with Dual Connection off by default.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Operating temperature

Nothing Ear (3)Not verified

Sennheiser HD 660S2−10 °C to +55 °C

Sources

Nothing Ear (3)

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.

Rated sensitivity

Nothing Ear (3)Not verified

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

Sources

Nothing Ear (3)

No source recorded for this side.

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

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

Replaceable parts

Nothing Ear (3)Not verified

Sennheiser HD 660S2Detachable cable and replaceable ear pads

Sources

Nothing Ear (3)

No source recorded for this side.

Sennheiser HD 660S2

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

Sennheiser HD 660S2 — operating guide and specifications

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

Spatial audio

Nothing Ear (3)Static Spatial Audio

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Listed under Sound features. Nothing describes it as creating a 3D soundscape; the pages do not mention head tracking.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Manufacturer sub-bass claim

Nothing Ear (3)Not verified

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sources

Nothing Ear (3)

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.

Dust, sweat and water resistance

Nothing Ear (3)IP54 (earbuds and case)

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Weight per earbud

Nothing Ear (3)5.2 g

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification · Each earbud. Nothing lists 71.4 g for the earbuds and case together (buds-and-case weight), not the case alone.

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Dimensions

Nothing Ear (3)Each earbud 30.5 x 21.5 x 20.75 mm; charging case 55.5 x 55.5 x 22.25 mm (height x width x depth)

Sennheiser HD 660S2Not verified

Sources

Nothing Ear (3)

Manufacturer specification

Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications

Sennheiser HD 660S2

No source recorded for this side.

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

Weight

Nothing Ear (3)Not verified

Sennheiser HD 660S2260 g

Sources

Nothing Ear (3)

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 660S2 — operating guide and specifications

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

0 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

Nothing Ear (3)

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

Nothing Ear (3)

What it brings

For calls, each earbud has three MEMS microphones and a voice pickup unit that senses vibrations from your jawbone, and the case holds Super Mic: two beamforming MEMS microphones you switch to with the case's Talk button, which Nothing recommends holding about 5 cm from your mouth in loud places.
Manufacturer source
The case charges both over USB-C and wirelessly, and with AAC Nothing rates up to 10 hours per charge (ANC off) and 38 hours with the case.
Manufacturer source

What to check

Using LDAC cuts rated earbud playback to 3.5 hours with ANC on (5.5 hours off), against 5.5 and 10 hours with AAC.
Manufacturer source
Dust and water resistance is IP54, and Nothing says turning on dual connection affects Super Mic behaviour, so the two features do not fully work together by default.
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

36 of 36 specifications Sources in each row

Source-backed specifications for Nothing Ear (3) and Sennheiser HD 660S2
Specification	Nothing Ear (3)	Sennheiser HD 660S2

Wearing styleDifferent Sources Nothing Ear (3) Manufacturer specification · Two earbuds and a charging case; three pairs of ear tips are in the box. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	In-ear, true wireless (stem earbuds with silicone ear tips)	Over-ear (circumaural), open-back dynamic headphones
Weight per earbud Sources Nothing Ear (3) Manufacturer specification · Each earbud. Nothing lists 71.4 g for the earbuds and case together (buds-and-case weight), not the case alone. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	5.2 g	Not provided
Dimensions Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Each earbud 30.5 x 21.5 x 20.75 mm; charging case 55.5 x 55.5 x 22.25 mm (height x width x depth)	Not provided
Dust, sweat and water resistance Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	IP54 (earbuds and case)	Not provided
Weight Sources Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification · Approximate, without the cable. Sennheiser HD 660S2 — operating guide and specifications	Not provided	260 g
Acoustic design Sources Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Open-back
Replaceable parts Sources Nothing Ear (3) 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
Ear pads Sources Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	Velour ear pads; replaceable
Rated contact pressure Sources Nothing Ear (3) 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 Nothing Ear (3) Manufacturer specification · Charging to full takes 70 minutes over USB-C or 120 minutes wirelessly, per Nothing. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Bluetooth 5.4 (AAC, SBC, LDAC) with dual connection; USB-C and wireless charging on the case	Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter
Battery life Sources Nothing Ear (3) Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with volume, calls, source and features. Talk time is separately listed (earbuds 4 h ANC on / 5 h ANC off; with case 15.5 h / 19 h). Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical 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	AAC: earbuds up to 5.5 hours with ANC on and up to 10 hours with ANC off; with the charging case up to 22 hours with ANC on and up to 38 hours with ANC off. LDAC: earbuds up to 3.5 hours with ANC on and 5.5 hours with ANC off (no case total given for LDAC).	Not listed by the manufacturer
Bluetooth codecs Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	AAC, SBC, LDAC (Hi-Res certified)	Not provided
Multipoint (dual connection) Sources Nothing Ear (3) Manufacturer specification · Nothing notes that turning Dual Connection on affects Super Mic functionality; Super Mic is prioritised with Dual Connection off by default. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Yes	Not provided
Low Lag Mode Sources Nothing Ear (3) Manufacturer specification · Latency can be reduced to as low as 110 ms only when the earbuds are paired with Nothing phones with Game Mode turned on (footnote 3). Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Low Lag Mode (latency as low as 110 ms)	Not provided
Quick pairing Sources Nothing Ear (3) Manufacturer specification · Fast Pair works on supported Android devices running Google Play services 11.7+ (back to Android 6.0); Find My and device renaming support need Android 10 or later. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Google Fast Pair and Microsoft Swift Pair	Not provided
Battery capacity Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Earbuds 55 mAh each; case 500 mAh	Not provided
Included cable length Sources Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification · Length of the supplied cable. Sennheiser HD 660S2 — operating guide and specifications	Not provided	1.8 m
Supplied plug configuration Sources Nothing Ear (3) No source recorded. 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	Not provided	6.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter
Included and optional cables Sources Nothing Ear (3) 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

DriversDifferent Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications	12 mm dynamic driver, 32 Ω, PMI + TPU diaphragm	38 mm open dynamic transducer; aluminium voice coil and vented magnet system
Spatial audio Sources Nothing Ear (3) Manufacturer specification · Listed under Sound features. Nothing describes it as creating a 3D soundscape; the pages do not mention head tracking. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Static Spatial Audio	Not provided
Frequency responseDifferent Sources Nothing Ear (3) Manufacturer specification · Listed as 'RF' under Sound in Nothing's specification table. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	20 Hz – 40 kHz	8–41,500 Hz (−10 dB)
Nominal impedance Sources Nothing Ear (3) No source recorded. 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	Not provided	300 ohm
Rated sensitivity Sources Nothing Ear (3) No source recorded. 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	Not provided	104 dB SPL at 1 kHz, 1 V rms
Frequency equalisation Sources Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Diffuse-field equalised
Rated total harmonic distortion Sources Nothing Ear (3) No source recorded. 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	Not provided	≤0.04% at 1 kHz, 100 dB SPL
Rated long-term input power Sources Nothing Ear (3) 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 Nothing Ear (3) 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 Nothing Ear (3) 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

Microphone Sources Nothing Ear (3) Manufacturer specification · Three MEMS microphones per earbud plus a voice pickup unit (VPU) per earbud; the charging case also contains a dual-microphone 'Super Mic' activated with its Talk button. Nothing (UK store, nothing.tech) — Ear (3) product page with technical 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	Yes	Not listed by the manufacturer
Active noise cancellation Sources Nothing Ear (3) Manufacturer specification · Real-time adaptive ANC up to 45 dB (Nothing's laboratory theoretical maximum) with a Transparency mode. Nothing (UK store, nothing.tech) — Ear (3) product page with technical 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	Yes	Not listed by the manufacturer

Companion app Sources Nothing Ear (3) Manufacturer specification · Nothing X is for Android 6.0 and above and iOS 13 and above; on Nothing OS 1.5.6 and higher the settings are built into the phone. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Nothing X app: custom EQ with profile sharing (8-band equaliser), Personal Sound profile (Audiodo), Dynamic Bass Enhancement, customisable controls, find my earbuds, dual connection, ear tips fit test and firmware updates	Not provided
Controls Sources Nothing Ear (3) Manufacturer specification · Next/previous track, noise cancellation/transparency, volume and the Talk button's non-call actions are marked customisable in the Nothing X app. Essential Space is available only on select Nothing devices with the Essential Key. Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Pinch sensor on each earbud: pinch for play/pause and answer/end call; double pinch for next track or reject call; triple pinch for previous track; hold for noise cancellation/transparency; pinch and hold for volume up/down. Case Talk button: press and hold during a call to use Super Mic, double press to lock it in; outside calls, press and hold for Essential Space (Nothing OS) or the voice assistant (iOS/Android).	Not provided
In-ear detection Sources Nothing Ear (3) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3) product page with technical specifications Nothing (US store, us.nothing.tech) — Ear (3) product page with technical specifications Sennheiser HD 660S2 No source recorded.	Yes	Not provided

Static magnetic field at the surface Sources Nothing Ear (3) 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 Nothing Ear (3) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	−10 °C to +55 °C

First product manufacturer source Second product manufacturer source

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