HEADPHONES · YOUR NEXT FACE-OFF

Nothing CMF Buds 2 Plus vs Sennheiser HD 600

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

Compared products

YOUR FIRST CHOICE

Nothing CMF Buds 2 Plus

6974434225114 · Light Grey · UK

CMF Buds 2 Plus light grey earbuds in an open light grey charging case marked Buds 2 Plus

Full product profile Official image

Exact model & source notes

CMF Buds 2 Plus (store SKU 6974434225114 in Light Grey on the UK and US Nothing stores) are true wireless earbuds from Nothing's CMF sub-brand, with hybrid ANC up to 50 dB, a 12 mm LCP driver, LDAC and a hearing-test-based Personal Sound profile.

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 CMF Buds 2 Plus for

A wireless connection

Choose the Sennheiser HD 600 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 600

508824 · grey finish · 300 ohm · standard 3 m stereo cable

Full product profile Official image

Exact model & source notes

The HD 600 is an open-back, over-ear dynamic headphone. Sennheiser describes a 42 mm driver with a 38 mm diaphragm and aluminium voice coils, rated 12–40,500 Hz (−10 dB) at 300 ohms. It has a detachable 3 m cable and replaceable velour ear pads.

Specifications checked 11 Sept 2026.

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

Manufacturer specifications

Nothing CMF Buds 2 Plus UK & US retailers

UK & US price history: no verified listing yet

Sennheiser HD 600 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 CMF Buds 2 PlusNot verified

Sennheiser HD 600Yes

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

Nothing CMF Buds 2 PlusBluetooth 5.4 (AAC, SBC, LDAC) with dual connection; USB-C charging on the case

Sennheiser HD 600Wired analogue stereo; detachable 3 m cable and supplied adapter support 3.5 mm and 6.35 mm connections

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · LDAC needs a supporting Android device and the High-Quality Audio setting in Nothing X. Fast charging is quoted with a Type-C charging cable.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

Manufacturer specification · Sennheiser's manual and UK page disagree on which plug is native; see Supplied plug configuration.

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Drivers

Nothing CMF Buds 2 PlusCustom 12 mm dynamic driver, LCP + PU diaphragm

Sennheiser HD 600Open dynamic 42 mm driver with a 38 mm diaphragm and aluminium voice coils

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

Manufacturer specification · Sennheiser gives 42 mm for the driver and 38 mm for its diaphragm; it does not say how the 42 mm figure is measured.

Sennheiser HD 600 — 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 CMF Buds 2 PlusIn-ear, true wireless (ear tips in sizes S, M and L)

Sennheiser HD 600Over-ear (circumaural), open-back dynamic headphones

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · A pair of earbuds and a charging case; ear tips in sizes S, M and L are in the box. Nothing does not state the ear tip material.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

Manufacturer specification

Sennheiser HD 600 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Missing or non-comparable evidence (35)

Acoustic design

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600Open-back

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification

Sennheiser HD 600 — operating guide and specifications

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

Active noise cancellation

Nothing CMF Buds 2 PlusYes

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Hybrid ANC up to 50 dB (Nothing's laboratory theoretical maximum) over up to 5400 Hz, with Smart Adaptive mode, Environmental Adaptive ANC and Transparency mode.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 600 — 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 CMF Buds 2 PlusYes

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Six HD microphones in total (three per bud) with Clear Voice Technology 3.0 and Wind Noise Reduction 3.0.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 600 — operating guide and specifications

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

Battery life

Nothing CMF Buds 2 PlusAAC: earbuds up to 7.5 hours with ANC on and 14 hours with ANC off; with the case 33 hours with ANC on and 61.5 hours with ANC off. LDAC: earbuds up to 5.5 hours ANC on / 8 hours ANC off; with case up to 25 hours ANC on / 36 hours ANC off.

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with use. Talk time is listed separately (earbuds 6.5 h ANC on / 8 h ANC off; with case 29 h / 34 h).

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 600 — operating guide and specifications

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

Nominal impedance

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600300 ohm

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

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

Sennheiser HD 600 — operating guide and specifications

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

Published acoustic changes

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Sennheiser does not describe an acoustic revision for the HD 600. · Manufacturer specification

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Companion app

Nothing CMF Buds 2 PlusNothing X app (Android and iOS): customise equaliser and controls, find my earbuds, low lag mode, software updates

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

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. LDAC needs High-Quality Audio turned on in Nothing X.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusEarbuds 53 mAh each; case 460 mAh

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600Detachable 3 m unbalanced cable included; 4.4 mm and XLR-4 balanced cables optional

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

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

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Included cable length

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 6003 m

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Length of the supplied cable.

Sennheiser HD 600 — operating guide and specifications

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

Charge time

Nothing CMF Buds 2 PlusFull charge (0-100%) in 95 minutes with the case connected to a USB-C cable; with the case unplugged, the earbuds charge inside it in 60 minutes

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Fast charge: after a 10-minute charge, up to 8.5 hours of playback with the case or 4.5 hours without it (ANC off, 50% volume, AAC, Nothing laboratory, 25 °C).

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

No source recorded for this side.

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

Bluetooth codecs

Nothing CMF Buds 2 PlusAAC, SBC, LDAC (Hi-Res Wireless Audio certified)

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600Conflicting evidence

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Sennheiser's manual and UK specification table list a 3.5 mm plug with a 6.35 mm adapter, while the UK page's connection text describes a 6.3 mm plug with a 3.5 mm adapter. Check the listing for the supplied plug. · Manufacturer specification · Needs a matching headphone output; the 4.4 mm balanced cable needs a balanced output.

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Rated contact pressure

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600Approximately 6.0 N ±1.0 N

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

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

Sennheiser HD 600 — operating guide and specifications

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

Controls

Nothing CMF Buds 2 PlusTouch controls: double tap to skip forward or answer/hang up calls; triple tap to skip back or reject calls; tap and hold to switch between Active Noise Cancellation and Transparency Mode.

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Customisable (footnote 9): double tap, triple tap, tap & hold and double tap & hold can be set to next song, previous song, volume up, volume down, voice assistant or switching noise cancellation modes, via phone settings on Nothing OS 1.5.6+ or the Nothing X app on Android 6.0+/iOS 13+.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600≤0.1% at 1 kHz, 1 V rms (DIN 45500)

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Rated to DIN 45500; other models use different test levels, so compare with care.

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Ear pads

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600Velour ear pads; replaceable

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Replacement procedure shown in the manual.

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Quick pairing

Nothing CMF Buds 2 PlusGoogle Fast Pair and Microsoft Swift Pair

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

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) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600Diffuse-field equalised

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification

Sennheiser HD 600 — operating guide and specifications

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

Rated frequency range

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 60012–40,500 Hz (−10 dB)

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification

Sennheiser HD 600 — operating guide and specifications

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

In-ear detection

Nothing CMF Buds 2 PlusYes

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 6000.2 W under DIN 45580

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Rated to DIN 45580; the maximum input the headphones can handle, not the amplifier power they need.

Sennheiser HD 600 — operating guide and specifications

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

Low lag mode

Nothing CMF Buds 2 Plusless than 110 ms (as low as 105 ms)

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Only with a Nothing phone in Game Mode. The Other features table says 'less than 110 ms under Game Mode'; footnote 7 says latency can be reduced to as low as 105 ms. Source field: Low lag mode.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 6001.8 mT

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Static magnetic field at the headphone surface.

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Multipoint (dual connection)

Nothing CMF Buds 2 PlusYes

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600−10 °C to +55 °C

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification

Sennheiser HD 600 — operating guide and specifications

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

Rated sensitivity

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 60097 dB SPL at 1 kHz, 1 V rms

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

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

Sennheiser HD 600 — operating guide and specifications

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

Replaceable parts

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600Detachable cable and replaceable ear pads

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

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

Sennheiser HD 600 — operating guide and specifications

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

Sound features

Nothing CMF Buds 2 PlusPersonal Sound Profile, Spatial Audio Effect, Ultra Bass Technology 2.0, Custom EQ; tuning by Nothing

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Personal Sound is powered by Audiodo and uses a pure tone audiometry test.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

No source recorded for this side.

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

Spatial audio

Nothing CMF Buds 2 PlusSpatial Audio Effect (HRTF-based)

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Nothing says it uses Head-Related Transfer Function (HRTF) technology for a three-dimensional listening experience; head tracking is not mentioned.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 PlusNot verified

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Sennheiser makes no sub-bass claim for the HD 600. · Manufacturer specification

Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications

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

Dust, sweat and water resistance

Nothing CMF Buds 2 PlusIP55 (earbuds)

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

The specification lists 'IPX2 case', but footnote 6 says the charging case is not rated for water-proofing; the case rating is therefore left out. · Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

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 CMF Buds 2 Plus4.5 g

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification · Each earbud. The charging case weighs 42.5 g.

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

No source recorded for this side.

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

Dimensions

Nothing CMF Buds 2 PlusEach earbud 33.6 x 20.9 x 22.7 mm; charging case 53.3 x 53.3 x 23 mm (height x width x depth)

Sennheiser HD 600Not verified

Sources

Nothing CMF Buds 2 Plus

Manufacturer specification

Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications

Sennheiser HD 600

No source recorded for this side.

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

Weight

Nothing CMF Buds 2 PlusNot verified

Sennheiser HD 600260 g

Sources

Nothing CMF Buds 2 Plus

No source recorded for this side.

Sennheiser HD 600

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 600 — 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 CMF Buds 2 Plus

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 600

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 CMF Buds 2 Plus

What it brings

Nothing rates 14 hours per charge and 61.5 hours with the case using AAC with ANC off, or 7.5 and 33 hours with ANC on.
Manufacturer source
It supports LDAC and dual connection, and its Personal Sound profile, powered by Audiodo, is built from a pure tone audiometry hearing test.
Manufacturer source

What to check

The case charges over USB-C only; no wireless charging is listed, and LDAC works only with supporting Android phones and cuts rated playback to 5.5 hours with ANC on.
Manufacturer source
The earbuds are IP55, but Nothing's own page is inconsistent about the case (IPX2 in the table, not water-proof rated in the footnote).
Manufacturer source

Sennheiser HD 600

What it brings

The detachable 3 m cable and velour ear pads can be replaced, and optional 4.4 mm and XLR-4 balanced cables are available for balanced amplifiers.
Manufacturer source Manufacturer source

What to check

At 300 ohms with a rated 97 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. Sennheiser's pages disagree on whether the cable ends in a 3.5 mm or 6.35 mm plug, so check the listing.
Manufacturer source Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

38 of 38 specifications Sources in each row

Source-backed specifications for Nothing CMF Buds 2 Plus and Sennheiser HD 600
Specification	Nothing CMF Buds 2 Plus	Sennheiser HD 600

Wearing styleDifferent Sources Nothing CMF Buds 2 Plus Manufacturer specification · A pair of earbuds and a charging case; ear tips in sizes S, M and L are in the box. Nothing does not state the ear tip material. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 Manufacturer specification Sennheiser HD 600 — operating guide and specifications	In-ear, true wireless (ear tips in sizes S, M and L)	Over-ear (circumaural), open-back dynamic headphones
Weight per earbud Sources Nothing CMF Buds 2 Plus Manufacturer specification · Each earbud. The charging case weighs 42.5 g. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	4.5 g	Not provided
Dimensions Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Each earbud 33.6 x 20.9 x 22.7 mm; charging case 53.3 x 53.3 x 23 mm (height x width x depth)	Not provided
Dust, sweat and water resistance Sources Nothing CMF Buds 2 Plus The specification lists 'IPX2 case', but footnote 6 says the charging case is not rated for water-proofing; the case rating is therefore left out. · Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	IP55 (earbuds)	Not provided
Weight Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Approximate, without the cable. Sennheiser HD 600 — operating guide and specifications	Not provided	260 g
Acoustic design Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification Sennheiser HD 600 — operating guide and specifications	Not provided	Open-back
Replaceable parts Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 600 — operating guide and specifications	Not provided	Detachable cable and replaceable ear pads
Ear pads Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	Velour ear pads; replaceable
Rated contact pressure Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 600 — operating guide and specifications	Not provided	Approximately 6.0 N ±1.0 N

Wired / wireless connectionsDifferent Sources Nothing CMF Buds 2 Plus Manufacturer specification · LDAC needs a supporting Android device and the High-Quality Audio setting in Nothing X. Fast charging is quoted with a Type-C charging cable. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 Manufacturer specification · Sennheiser's manual and UK page disagree on which plug is native; see Supplied plug configuration. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Bluetooth 5.4 (AAC, SBC, LDAC) with dual connection; USB-C charging on the case	Wired analogue stereo; detachable 3 m cable and supplied adapter support 3.5 mm and 6.35 mm connections
Battery life Sources Nothing CMF Buds 2 Plus Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with use. Talk time is listed separately (earbuds 6.5 h ANC on / 8 h ANC off; with case 29 h / 34 h). Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 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 600 — operating guide and specifications	AAC: earbuds up to 7.5 hours with ANC on and 14 hours with ANC off; with the case 33 hours with ANC on and 61.5 hours with ANC off. LDAC: earbuds up to 5.5 hours ANC on / 8 hours ANC off; with case up to 25 hours ANC on / 36 hours ANC off.	Not listed by the manufacturer
Charge time Sources Nothing CMF Buds 2 Plus Manufacturer specification · Fast charge: after a 10-minute charge, up to 8.5 hours of playback with the case or 4.5 hours without it (ANC off, 50% volume, AAC, Nothing laboratory, 25 °C). Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Full charge (0-100%) in 95 minutes with the case connected to a USB-C cable; with the case unplugged, the earbuds charge inside it in 60 minutes	Not provided
Bluetooth codecs Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	AAC, SBC, LDAC (Hi-Res Wireless Audio certified)	Not provided
Multipoint (dual connection) Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Yes	Not provided
Low lag mode Sources Nothing CMF Buds 2 Plus Manufacturer specification · Only with a Nothing phone in Game Mode. The Other features table says 'less than 110 ms under Game Mode'; footnote 7 says latency can be reduced to as low as 105 ms. Source field: Low lag mode. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	less than 110 ms (as low as 105 ms)	Not provided
Quick pairing Sources Nothing CMF Buds 2 Plus 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) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Google Fast Pair and Microsoft Swift Pair	Not provided
Battery capacity Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Earbuds 53 mAh each; case 460 mAh	Not provided
Included cable length Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Length of the supplied cable. Sennheiser HD 600 — operating guide and specifications	Not provided	3 m
Included and optional cables Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	Detachable 3 m unbalanced cable included; 4.4 mm and XLR-4 balanced cables optional

DriversDifferent Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 Manufacturer specification · Sennheiser gives 42 mm for the driver and 38 mm for its diaphragm; it does not say how the 42 mm figure is measured. Sennheiser HD 600 — exact model specifications	Custom 12 mm dynamic driver, LCP + PU diaphragm	Open dynamic 42 mm driver with a 38 mm diaphragm and aluminium voice coils
Spatial audio Sources Nothing CMF Buds 2 Plus Manufacturer specification · Nothing says it uses Head-Related Transfer Function (HRTF) technology for a three-dimensional listening experience; head tracking is not mentioned. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Spatial Audio Effect (HRTF-based)	Not provided
Sound features Sources Nothing CMF Buds 2 Plus Manufacturer specification · Personal Sound is powered by Audiodo and uses a pure tone audiometry test. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Personal Sound Profile, Spatial Audio Effect, Ultra Bass Technology 2.0, Custom EQ; tuning by Nothing	Not provided
Nominal impedance Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load. Sennheiser HD 600 — operating guide and specifications	Not provided	300 ohm
Rated frequency range Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification Sennheiser HD 600 — operating guide and specifications	Not provided	12–40,500 Hz (−10 dB)
Rated sensitivity Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings. Sennheiser HD 600 — operating guide and specifications	Not provided	97 dB SPL at 1 kHz, 1 V rms
Frequency equalisation Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification Sennheiser HD 600 — operating guide and specifications	Not provided	Diffuse-field equalised
Rated total harmonic distortion Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Rated to DIN 45500; other models use different test levels, so compare with care. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	≤0.1% at 1 kHz, 1 V rms (DIN 45500)
Rated long-term input power Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Rated to DIN 45580; the maximum input the headphones can handle, not the amplifier power they need. Sennheiser HD 600 — operating guide and specifications	Not provided	0.2 W under DIN 45580

Microphone Sources Nothing CMF Buds 2 Plus Manufacturer specification · Six HD microphones in total (three per bud) with Clear Voice Technology 3.0 and Wind Noise Reduction 3.0. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 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 600 — operating guide and specifications	Yes	Not listed by the manufacturer
Active noise cancellation Sources Nothing CMF Buds 2 Plus Manufacturer specification · Hybrid ANC up to 50 dB (Nothing's laboratory theoretical maximum) over up to 5400 Hz, with Smart Adaptive mode, Environmental Adaptive ANC and Transparency mode. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 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 600 — operating guide and specifications	Yes	Not listed by the manufacturer

Companion app Sources Nothing CMF Buds 2 Plus 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. LDAC needs High-Quality Audio turned on in Nothing X. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Nothing X app (Android and iOS): customise equaliser and controls, find my earbuds, low lag mode, software updates	Not provided
Controls Sources Nothing CMF Buds 2 Plus Manufacturer specification · Customisable (footnote 9): double tap, triple tap, tap & hold and double tap & hold can be set to next song, previous song, volume up, volume down, voice assistant or switching noise cancellation modes, via phone settings on Nothing OS 1.5.6+ or the Nothing X app on Android 6.0+/iOS 13+. Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Touch controls: double tap to skip forward or answer/hang up calls; triple tap to skip back or reject calls; tap and hold to switch between Active Noise Cancellation and Transparency Mode.	Not provided
In-ear detection Sources Nothing CMF Buds 2 Plus Manufacturer specification Nothing (UK store, nothing.tech) — CMF Buds 2 Plus product page with technical specifications Nothing (US store, us.nothing.tech) — CMF Buds 2 Plus product page with technical specifications Sennheiser HD 600 No source recorded.	Yes	Not provided

Static magnetic field at the surface Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	1.8 mT
Operating temperature Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Manufacturer specification Sennheiser HD 600 — operating guide and specifications	Not provided	−10 °C to +55 °C

Show unverified (3)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Supplied plug configuration Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Sennheiser's manual and UK specification table list a 3.5 mm plug with a 6.35 mm adapter, while the UK page's connection text describes a 6.3 mm plug with a 3.5 mm adapter. Check the listing for the supplied plug. · Manufacturer specification · Needs a matching headphone output; the 4.4 mm balanced cable needs a balanced output. Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	Conflicting sources
Published acoustic changes Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Sennheiser does not describe an acoustic revision for the HD 600. · Manufacturer specification Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	Not listed by the manufacturer
Manufacturer sub-bass claim Sources Nothing CMF Buds 2 Plus No source recorded. Sennheiser HD 600 Sennheiser makes no sub-bass claim for the HD 600. · Manufacturer specification Sennheiser HD 600 — exact model specifications Sennheiser HD 600 — operating guide and specifications	Not provided	Not listed by the manufacturer

First product manufacturer source Second product manufacturer source

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