HEADPHONES · YOUR NEXT FACE-OFF

Google Pixel Buds 2a vs Sennheiser HD 660S2

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

Compared products

YOUR FIRST CHOICE

Google Pixel Buds 2a

Hazel · UK

Full product profile Official image

Exact model & source notes

Pixel Buds 2a are Google's noise-cancelling true wireless earbuds, with a Google Tensor A1 chip, Bluetooth 5.4 and an 11 mm dynamic driver in each earbud. This record is the Hazel colour from the UK Google Store; Google rates the earbuds at up to 7 hours with ANC on and 20 hours with the USB-C charging case.

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 Google Pixel Buds 2a 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 3 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

Google Pixel Buds 2a 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.

Google Pixel Buds 2aNot 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 ↓

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

Wired / wireless connections

Google Pixel Buds 2aBluetooth 5.4 (each earbud); USB-C charging port 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

Google Pixel Buds 2a

Manufacturer specification · No wireless charging is listed for this case. Google states it pairs with any Bluetooth 4.0+ device; full feature access needs a Google Account, an Android 6.0+ companion phone and an internet connection. No codec list is published on the specification page.

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aCustom-designed 11 mm dynamic driver (each earbud)

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

Sources

Google Pixel Buds 2a

Manufacturer specification

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aIn-ear, true wireless (eartips in four sizes)

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

Sources

Google Pixel Buds 2a

Manufacturer specification · Two separate earbuds with a charging case; eartips in four size options (extra small, small, medium attached to earbuds, large) are in the box. Google does not state the eartip material.

Google Store (UK) — Pixel Buds 2a Technical Specs

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Missing or non-comparable evidence (27)

Acoustic design

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Open-back

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aYes

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification · Active Noise Cancellation with Silent Seal 1.5, plus Transparency mode and active in-ear pressure relief.

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aYes

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification · Two microphones per earbud; Clear Calling and wind-blocking mesh covers.

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aEarbuds: up to 7 hours with Active Noise Cancellation on, up to 10 hours with it off. With the charging case: up to 20 hours total with ANC on, up to 27 hours with ANC off. A 5-minute charge in the case gives up to 1 hour with ANC on.

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification · Google's stated listening-time ratings on the UK and US specification pages; the page gives no further test conditions.

Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2300 ohm

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S21.8 m

Sources

Google Pixel Buds 2a

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.

Headphone chip

Google Pixel Buds 2aGoogle Tensor A1 (each earbud)

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sources

Google Pixel Buds 2a

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.

Earbud controls

Google Pixel Buds 2aCapacitive touch (tap) for music, calls and voice assistant; IR proximity in-ear detection

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Velour ear pads; replaceable

Sources

Google Pixel Buds 2a

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.

Frequency equalisation

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Diffuse-field equalised

Sources

Google Pixel Buds 2a

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 frequency range

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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 long-term input power

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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.

Static magnetic field at the surface

Google Pixel Buds 2aNot verified

Sennheiser HD 660S24.5 mT

Sources

Google Pixel Buds 2a

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.

Operating temperature

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2−10 °C to +55 °C

Sources

Google Pixel Buds 2a

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.

Security updates

Google Pixel Buds 2aAutomatic security updates for at least three years

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification · Counted from when the device first became available on the Google Store in the US.

Google Store (UK) — Pixel Buds 2a Technical Specs

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 sensitivity

Google Pixel Buds 2aNot verified

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

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Detachable cable and replaceable ear pads

Sources

Google Pixel Buds 2a

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.

Manufacturer sub-bass claim

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2aEarbuds IP54; case IPX4

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification

Google Store (UK) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2a4.7 g

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification · Each earbud with the medium eartip. The charging case weighs 47.6 g with the earbuds inside.

Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aEach earbud (with medium eartip): 23.1 x 16.0 x 17.8 mm; charging case: 50.0 x 24.5 x 57.2 mm

Sennheiser HD 660S2Not verified

Sources

Google Pixel Buds 2a

Manufacturer specification

Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs

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

Google Pixel Buds 2aNot verified

Sennheiser HD 660S2260 g

Sources

Google Pixel Buds 2a

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

Google Pixel Buds 2a

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

Google Pixel Buds 2a

What it brings

Active Noise Cancellation with Silent Seal 1.5, Transparency mode and in-ear pressure relief are included, powered by the Tensor A1 chip in each earbud.
Manufacturer source
The charging case weighs 47.6 g with the earbuds inside and measures 50.0 x 24.5 x 57.2 mm; each earbud weighs 4.7 g with the medium eartip.
Manufacturer source

What to check

The case charges only over USB-C; Google lists no wireless charging and no case speaker for this model, and the earbuds have two microphones each and tap-only touch controls.
Manufacturer source
Rated ANC-on battery is 7 hours per charge and 20 hours with the case. Full feature access requires a Google Account and an Android 6.0 or newer phone.
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

30 of 30 specifications Sources in each row

Source-backed specifications for Google Pixel Buds 2a and Sennheiser HD 660S2
Specification	Google Pixel Buds 2a	Sennheiser HD 660S2

Wearing styleDifferent Sources Google Pixel Buds 2a Manufacturer specification · Two separate earbuds with a charging case; eartips in four size options (extra small, small, medium attached to earbuds, large) are in the box. Google does not state the eartip material. Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	In-ear, true wireless (eartips in four sizes)	Over-ear (circumaural), open-back dynamic headphones
Weight Sources Google Pixel Buds 2a Manufacturer specification · Each earbud with the medium eartip. The charging case weighs 47.6 g with the earbuds inside. Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	4.7 g	Not provided
Dimensions Sources Google Pixel Buds 2a Manufacturer specification Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	Each earbud (with medium eartip): 23.1 x 16.0 x 17.8 mm; charging case: 50.0 x 24.5 x 57.2 mm	Not provided
Dust, sweat and water resistance Sources Google Pixel Buds 2a Manufacturer specification Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	Earbuds IP54; case IPX4	Not provided
Weight Sources Google Pixel Buds 2a 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 Google Pixel Buds 2a No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Open-back
Replaceable parts Sources Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a Manufacturer specification · No wireless charging is listed for this case. Google states it pairs with any Bluetooth 4.0+ device; full feature access needs a Google Account, an Android 6.0+ companion phone and an internet connection. No codec list is published on the specification page. Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Bluetooth 5.4 (each earbud); USB-C charging port 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 Google Pixel Buds 2a Manufacturer specification · Google's stated listening-time ratings on the UK and US specification pages; the page gives no further test conditions. Google Store (UK) — Pixel Buds 2a Technical Specs Google Store (US) — Pixel Buds 2a Technical Specs 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	Earbuds: up to 7 hours with Active Noise Cancellation on, up to 10 hours with it off. With the charging case: up to 20 hours total with ANC on, up to 27 hours with ANC off. A 5-minute charge in the case gives up to 1 hour with ANC on.	Not listed by the manufacturer
Included cable length Sources Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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

Headphone chip Sources Google Pixel Buds 2a Manufacturer specification Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	Google Tensor A1 (each earbud)	Not provided
DriversDifferent Sources Google Pixel Buds 2a Manufacturer specification Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications	Custom-designed 11 mm dynamic driver (each earbud)	38 mm open dynamic transducer; aluminium voice coil and vented magnet system
Nominal impedance Sources Google Pixel Buds 2a 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 frequency range Sources Google Pixel Buds 2a No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	8–41,500 Hz (−10 dB)
Rated sensitivity Sources Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a 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 Google Pixel Buds 2a Manufacturer specification · Two microphones per earbud; Clear Calling and wind-blocking mesh covers. Google Store (UK) — Pixel Buds 2a Technical Specs 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 Google Pixel Buds 2a Manufacturer specification · Active Noise Cancellation with Silent Seal 1.5, plus Transparency mode and active in-ear pressure relief. Google Store (UK) — Pixel Buds 2a Technical Specs 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

Earbud controls Sources Google Pixel Buds 2a Manufacturer specification Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	Capacitive touch (tap) for music, calls and voice assistant; IR proximity in-ear detection	Not provided
Security updates Sources Google Pixel Buds 2a Manufacturer specification · Counted from when the device first became available on the Google Store in the US. Google Store (UK) — Pixel Buds 2a Technical Specs Sennheiser HD 660S2 No source recorded.	Automatic security updates for at least three years	Not provided

Static magnetic field at the surface Sources Google Pixel Buds 2a 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 Google Pixel Buds 2a 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

FIND YOUR CONTENDERS

More products

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

See all 213 headphones

Sony INZONE H9 II

Cable length: 2 m
Wearing style: Closed over-ear dynamic gaming headset
Wired / wireless connections: 2.4 GHz USB-C transceiver, Bluetooth 5.3 Classic Audio or LE Audio, or supplied analogue headphone cable

Prices & product profile

Google Pixel Buds Pro 2

Weight per earbud: 4.7 g
Wearing style: In-ear, true wireless (eartips in four sizes)
Wired / wireless connections: Bluetooth 5.4 (each earbud); USB-C charging port and Qi-certified wireless charging on the case

Prices & product profile

Beyerdynamic MMX 330 PRO

Impedance: 48 Ω
Cable length: 2.5 m
Wearing style: Over-ear (circumaural), open-back wired gaming headset with boom microphone

Prices & product profile

Logitech G PRO X wired gaming headset in black with detachable boom microphone

Logitech PRO X Gaming Headset (wired)

Cable length: 2 m
Wearing style: Over-ear (circumaural) wired gaming headset with detachable boom microphone
Wired / wireless connections: Wired: 2 m PC cable with inline volume and mute, 1.5 m mobile cable with button, Y splitter for separate mic and headphone ports, and a USB external sound card (DAC)

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.