HEADPHONES · YOUR NEXT FACE-OFF

Samsung Galaxy Buds FE vs Sennheiser HD 660S2

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

Compared products

YOUR FIRST CHOICE

Samsung Galaxy Buds FE

Graphite · UK SM-R400NZAAEUA

Full product profile Official image

Exact model & source notes

Graphite in-ear wireless earbuds with replaceable ear tips and wing tips, active noise cancellation and Ambient Sound. Samsung rates music at up to six hours per charge with ANC on, or 21 hours including the case. Bluetooth 5.2, touch controls and USB-C case charging are documented for this exact UK model.

Specifications checked 17 Oct 2026.

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

Manufacturer specifications

WHICH SUITS YOU?

Choose the Samsung Galaxy Buds FE 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

Samsung Galaxy Buds FE 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.

Samsung Galaxy Buds FENot 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.

Connections

Samsung Galaxy Buds FEBluetooth 5.2; A2DP, AVRCP and HFP

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

Samsung Galaxy Buds FE

Manufacturer specification · The English guide lists Galaxy Wearable for Android 8.0 or later with 1.5 GB RAM or more; the UK page says more than 1.5 GB. The exact 1.5 GB boundary is not resolved. Samsung-specific features retain their separate account/device conditions; no identical functionality across all Bluetooth hosts is implied.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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.

Driver design

Samsung Galaxy Buds FECustom one-way speaker

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

Sources

Samsung Galaxy Buds FE

Manufacturer specification · No driver diameter, Pro planar tweeter or dual-amplifier specification is established in the selected FE source.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FEIn-ear, true wireless with replaceable ear tips and wing tips

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

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Two wing-tip sizes and three ear-tip sizes are supplied; the model-page footnote gives the fitted defaults.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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 (36)

Acoustic design

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Open-back

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FEYes

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · ANC is on by default. Touch-and-hold noise controls are configured in Galaxy Wearable. Ambient Sound has three configurable volume levels.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FEYes

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · The table lists Number of MIC: 6. The feature text describes a three-microphone arrangement with main, sub and inner microphones, personalised beamforming and DNN processing. No independent call-quality measurement is claimed.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FEMusic: earbuds up to 6 hours with ANC on or 8.5 hours with ANC off; earbuds with case up to 21 hours with ANC on or 30 hours with ANC off. Calls: earbuds up to 3.5/4 hours and with case up to 13/14 hours, with ANC on/off respectively.

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Internal testing paired pre-production Galaxy Buds FE with a recently released Galaxy smartphone at default settings. Actual life varies with usage, settings, charges and Bluetooth signal. Totals include the earbuds and case, not the case alone.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2300 ohm

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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.

Ambient Sound mode

Samsung Galaxy Buds FEYes

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Three levels of ambient-sound volume can be configured in Galaxy Wearable accessibility settings.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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.

Samsung Auto Switch

Samsung Galaxy Buds FEYes

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Requires Galaxy phones/tablets with One UI 3.1 or later or Galaxy Watch4 or later, signed into Samsung Account. The UK model page explicitly says Auto Switch is currently unavailable on PC; PC app availability is separate.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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.

Typical battery capacity

Samsung Galaxy Buds FE60 mAh per earbud; 479 mAh charging case

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Typical capacities; do not substitute for minimum capacity.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S21.8 m

Sources

Samsung Galaxy Buds FE

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.

Charging

Samsung Galaxy Buds FECharging case: USB Type-C wired charging

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Guide pages 5 and 8–11 identify the USB-C port, simultaneous case/earbud charging and the supplied USB-C cable. Chargers are sold separately. Wireless case charging is not established by these cited sources.

Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page

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.

Audio codecs

Samsung Galaxy Buds FESSC (Samsung Scalable Codec), AAC and SBC

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · The exact FE source names Scalable Codec. No SSC-UHQ, 24-bit/96 kHz or LE Audio capability is inferred from other Galaxy Buds models.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sources

Samsung Galaxy Buds FE

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.

Touch controls

Samsung Galaxy Buds FESingle touch for playback; double touch for next track and answer/end call; triple touch for previous track; configurable touch-and-hold

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · The guide says only single touch and touch-and-hold are enabled by default; other touch actions require activation in Galaxy Wearable.

Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Velour ear pads; replaceable

Sources

Samsung Galaxy Buds FE

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.

Equaliser

Samsung Galaxy Buds FEGalaxy Wearable equaliser

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · The page also says Galaxy Wearable is available on PC. This does not enable PC Auto Switch. The guide describes selecting equaliser options; Adaptive EQ is not inferred.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Diffuse-field equalised

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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.

Galaxy AI features

Samsung Galaxy Buds FEInterpreter listening through a compatible Samsung Galaxy smartphone

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Translation is supplied by the smartphone. The UK page identifies Galaxy S24/S24+/S24 Ultra support as of February 2024; account login, downloaded languages and current software may be required. Availability and accuracy vary.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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 items

Samsung Galaxy Buds FETwo earbuds, charging case, S/M and M/L wing tips, S/M/L ear tips, USB cable and quick start guide

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · M/L wing tips and medium ear tips are fitted by default. The guide identifies the USB Type-C cable; charger sold separately.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S24.5 mT

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2−10 °C to +55 °C

Sources

Samsung Galaxy Buds FE

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.

PC Auto Switch

Samsung Galaxy Buds FENo

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Explicit exact UK model-page footnote: Auto Switch is currently unavailable on PC. This does not mean the Galaxy Wearable PC app or general Bluetooth computer audio is absent.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

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

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Detachable cable and replaceable ear pads

Sources

Samsung Galaxy Buds FE

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.

SmartThings Find

Samsung Galaxy Buds FEYes

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Samsung Galaxy Android 9.0+ required; not supported in mainland China. Lost Mode needs prior setup and internet access on the finder’s compatible device. Lost Mode is not available for the charging case.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sources

Samsung Galaxy Buds FE

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.

Voice assistant

Samsung Galaxy Buds FEBixby voice wake-up

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Requires a compatible connected smart device, data/Wi-Fi connection and Samsung Account. Availability depends on device, country, carrier, language and recognised dialect.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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.

Dust and water-resistance rating

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

No IP rating is established in the inspected exact UK specification table or linked English guide. A rating from another Galaxy Buds model is not transferred. · Manufacturer specification

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page

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

Samsung Galaxy Buds FE5.6 g

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Each earbud; the charging case is separately listed at 40 g.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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.

Earbud and charging-case dimensions

Samsung Galaxy Buds FEEach earbud: 19.2 × 17.1 × 22.2 mm; case: 50.0 × 50.0 × 27.7 mm

Sennheiser HD 660S2Not verified

Sources

Samsung Galaxy Buds FE

Manufacturer specification · Manufacturer height × width × depth order.

Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes

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

Samsung Galaxy Buds FENot verified

Sennheiser HD 660S2260 g

Sources

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FE

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

Samsung Galaxy Buds FE

What it brings

Two wing-tip sizes and three ear-tip sizes provide documented fit options, with ANC and configurable Ambient Sound.
Manufacturer source
Samsung lists up to 8.5 hours of music with ANC off or six hours with ANC on, keeping the mode conditions explicit.
Manufacturer source
Touch controls handle playback and calls; a USB-C cable is supplied for the charging case.
Manufacturer source Manufacturer source

What to check

Samsung Auto Switch has Galaxy-device and account requirements, and the exact UK page states that PC Auto Switch is unavailable.
Manufacturer source
The inspected exact sources do not establish an IP rating or wireless case charging; neither is inferred from other Galaxy Buds.
Manufacturer source Manufacturer source
Battery figures are conditional manufacturer maxima. The longer totals include the charging case, and a charger is sold separately.
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

39 of 39 specifications Sources in each row

Source-backed specifications for Samsung Galaxy Buds FE and Sennheiser HD 660S2
Specification	Samsung Galaxy Buds FE	Sennheiser HD 660S2

Wearing styleDifferent Sources Samsung Galaxy Buds FE Manufacturer specification · Two wing-tip sizes and three ear-tip sizes are supplied; the model-page footnote gives the fitted defaults. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	In-ear, true wireless with replaceable ear tips and wing tips	Over-ear (circumaural), open-back dynamic headphones
Weight per earbud Sources Samsung Galaxy Buds FE Manufacturer specification · Each earbud; the charging case is separately listed at 40 g. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	5.6 g	Not provided
Earbud and charging-case dimensions Sources Samsung Galaxy Buds FE Manufacturer specification · Manufacturer height × width × depth order. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Each earbud: 19.2 × 17.1 × 22.2 mm; case: 50.0 × 50.0 × 27.7 mm	Not provided
Weight Sources Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Open-back
Replaceable parts Sources Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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

ConnectionsDifferent Sources Samsung Galaxy Buds FE Manufacturer specification · The English guide lists Galaxy Wearable for Android 8.0 or later with 1.5 GB RAM or more; the UK page says more than 1.5 GB. The exact 1.5 GB boundary is not resolved. Samsung-specific features retain their separate account/device conditions; no identical functionality across all Bluetooth hosts is implied. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Bluetooth 5.2; A2DP, AVRCP and HFP	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 Samsung Galaxy Buds FE Manufacturer specification · Internal testing paired pre-production Galaxy Buds FE with a recently released Galaxy smartphone at default settings. Actual life varies with usage, settings, charges and Bluetooth signal. Totals include the earbuds and case, not the case alone. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes 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	Music: earbuds up to 6 hours with ANC on or 8.5 hours with ANC off; earbuds with case up to 21 hours with ANC on or 30 hours with ANC off. Calls: earbuds up to 3.5/4 hours and with case up to 13/14 hours, with ANC on/off respectively.	Not listed by the manufacturer
Typical battery capacity Sources Samsung Galaxy Buds FE Manufacturer specification · Typical capacities; do not substitute for minimum capacity. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	60 mAh per earbud; 479 mAh charging case	Not provided
Audio codecs Sources Samsung Galaxy Buds FE Manufacturer specification · The exact FE source names Scalable Codec. No SSC-UHQ, 24-bit/96 kHz or LE Audio capability is inferred from other Galaxy Buds models. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	SSC (Samsung Scalable Codec), AAC and SBC	Not provided
Samsung Auto Switch Sources Samsung Galaxy Buds FE Manufacturer specification · Requires Galaxy phones/tablets with One UI 3.1 or later or Galaxy Watch4 or later, signed into Samsung Account. The UK model page explicitly says Auto Switch is currently unavailable on PC; PC app availability is separate. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Yes	Not provided
PC Auto Switch Sources Samsung Galaxy Buds FE Manufacturer specification · Explicit exact UK model-page footnote: Auto Switch is currently unavailable on PC. This does not mean the Galaxy Wearable PC app or general Bluetooth computer audio is absent. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	No	Not provided
Charging Sources Samsung Galaxy Buds FE Manufacturer specification · Guide pages 5 and 8–11 identify the USB-C port, simultaneous case/earbud charging and the supplied USB-C cable. Chargers are sold separately. Wireless case charging is not established by these cited sources. Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page Sennheiser HD 660S2 No source recorded.	Charging case: USB Type-C wired charging	Not provided
Included cable length Sources Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 designDifferent Sources Samsung Galaxy Buds FE Manufacturer specification · No driver diameter, Pro planar tweeter or dual-amplifier specification is established in the selected FE source. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications	Custom one-way speaker	38 mm open dynamic transducer; aluminium voice coil and vented magnet system
Equaliser Sources Samsung Galaxy Buds FE Manufacturer specification · The page also says Galaxy Wearable is available on PC. This does not enable PC Auto Switch. The guide describes selecting equaliser options; Adaptive EQ is not inferred. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page Sennheiser HD 660S2 No source recorded.	Galaxy Wearable equaliser	Not provided
Nominal impedance Sources Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE Manufacturer specification · The table lists Number of MIC: 6. The feature text describes a three-microphone arrangement with main, sub and inner microphones, personalised beamforming and DNN processing. No independent call-quality measurement is claimed. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes 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 Samsung Galaxy Buds FE Manufacturer specification · ANC is on by default. Touch-and-hold noise controls are configured in Galaxy Wearable. Ambient Sound has three configurable volume levels. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes 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
Ambient Sound mode Sources Samsung Galaxy Buds FE Manufacturer specification · Three levels of ambient-sound volume can be configured in Galaxy Wearable accessibility settings. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Yes	Not provided

Touch controls Sources Samsung Galaxy Buds FE Manufacturer specification · The guide says only single touch and touch-and-hold are enabled by default; other touch actions require activation in Galaxy Wearable. Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page Sennheiser HD 660S2 No source recorded.	Single touch for playback; double touch for next track and answer/end call; triple touch for previous track; configurable touch-and-hold	Not provided
Galaxy AI features Sources Samsung Galaxy Buds FE Manufacturer specification · Translation is supplied by the smartphone. The UK page identifies Galaxy S24/S24+/S24 Ultra support as of February 2024; account login, downloaded languages and current software may be required. Availability and accuracy vary. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Interpreter listening through a compatible Samsung Galaxy smartphone	Not provided
SmartThings Find Sources Samsung Galaxy Buds FE Manufacturer specification · Samsung Galaxy Android 9.0+ required; not supported in mainland China. Lost Mode needs prior setup and internet access on the finder’s compatible device. Lost Mode is not available for the charging case. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Yes	Not provided
Voice assistant Sources Samsung Galaxy Buds FE Manufacturer specification · Requires a compatible connected smart device, data/Wi-Fi connection and Samsung Account. Availability depends on device, country, carrier, language and recognised dialect. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Sennheiser HD 660S2 No source recorded.	Bixby voice wake-up	Not provided

Included items Sources Samsung Galaxy Buds FE Manufacturer specification · M/L wing tips and medium ear tips are fitted by default. The guide identifies the USB Type-C cable; charger sold separately. Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page Sennheiser HD 660S2 No source recorded.	Two earbuds, charging case, S/M and M/L wing tips, S/M/L ear tips, USB cable and quick start guide	Not provided

Static magnetic field at the surface Sources Samsung Galaxy Buds FE 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 Samsung Galaxy Buds FE No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	−10 °C to +55 °C

Show unverified (1)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Dust and water-resistance rating Sources Samsung Galaxy Buds FE No IP rating is established in the inspected exact UK specification table or linked English guide. A rating from another Galaxy Buds model is not transferred. · Manufacturer specification Samsung UK Galaxy Buds FE — exact Graphite SM-R400NZAAEUA specifications and footnotes Samsung Galaxy Buds FE English user manual rev.1.1 (28 April 2025), linked by the exact UK page Sennheiser HD 660S2 No source recorded.	Not listed by the manufacturer	Not provided

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.