HEADPHONES · YOUR NEXT FACE-OFF

Sennheiser HD 650 vs Sennheiser HD 599

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

Compared products

YOUR FIRST CHOICE

Sennheiser HD 650

508825 · titanium-silver · 300 ohm · standard 3 m unbalanced cable

Full product profile Official image

Exact model & source notes

The HD 650 is an open-back, over-ear headphone with a 42 mm dynamic driver rated 10–41,000 Hz (−10 dB) at 300 ohms. It comes with a detachable 3 m 6.35 mm cable and a 3.5 mm adapter; balanced cables are optional extras.

Specifications checked 11 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 HD 650 for

Higher stated nominal impedance: 300 ohm vs 50 ohm

Choose the HD 599 for

Lower stated nominal impedance: 50 ohm vs 300 ohm

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

See the 9 verified differences

THE CONTENDER

Sennheiser HD 599

506831 · Ivory · wired (not HD 599 SE)

Full product profile Official image

Exact model & source notes

The HD 599 (article 506831) is an open-back, over-ear wired headphone that Sennheiser describes as topping its 500 series, in an ivory finish with brown headband stitching. It has a 38 mm transducer with Sennheiser's E.A.R. (Ergonomic Acoustic Refinement) design, which Sennheiser says channels the audio signal directly into the ears, a 50 Ω impedance and soft replaceable ear pads, and comes with two cables — 3 m with a 6.3 mm plug and 1.2 m with a 3.5 mm plug. Sennheiser gives its weight as 250 g and explicitly lists active noise cancellation as False.

Specifications checked 27 Sept 2026.

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

Manufacturer specifications

HD 650 UK & US retailers

UK & US price history: no verified listing yet

HD 599 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 SIDE8 topics

Yes and No describe the listed feature. Missing evidence stays unverified.

SELECTED TOPIC

01 / 08

Impedance

Nominal electrical load, not sound quality or loudness. Output capability and headphone sensitivity matter together; impedance alone cannot decide whether an amplifier is needed.

Sennheiser HD 650300 Ω

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

Source 1

Sennheiser HD 59950 Ω

Source 1

Explore the full specifications

Start with your listening environment. Open and closed earcups suit different surroundings. A closed back is not the same as active noise cancellation. Check the exact cable and headphone output. We do not turn impedance, driver size or unpaired lab results into a sound-quality score.

WHAT CHANGES BETWEEN THEM?

Key differences

Full specifications ↓

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

Wired / wireless connections

Sennheiser HD 650Wired analogue; detachable 6.35 mm unbalanced cable and included 3.5 mm adapter

Sennheiser HD 599Wired analogue; two cables supplied — 3 m with 6.3 mm straight plug and 1.2 m with 3.5 mm straight plug — plus a 6.3 mm to 3.5 mm adapter

Sources

Sennheiser HD 650

Manufacturer specification · Optional 4.4 mm and XLR-4 balanced cables are sold separately.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

Check the exact configuration and source conditions for your use.

Nominal impedance

In Visual facts

Sennheiser HD 650300 ohm

Sennheiser HD 59950 ohm

Sources

Sennheiser HD 650

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

Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

Check the exact configuration and source conditions for your use.

Driver construction

Sennheiser HD 65042 mm dynamic transducer with 38 mm diaphragm and aluminium voice coil; acoustic mesh and hand-paired transducers within stated ±1 dB tolerance

Sennheiser HD 59938 mm transducer using Sennheiser’s proprietary transducer technology with the E.A.R. (Ergonomic Acoustic Refinement) design

Sources

Sennheiser HD 650

Manufacturer specification · The driver, diaphragm and voice-coil sizes describe different parts.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification · Sennheiser says the E.A.R. design channels the audio signal directly into the ears; the specification table gives the transducer size as 38 mm.

Sennheiser HD 599 — official UK product page and specifications Sennheiser UK store — HD 599 product variant data (SKU and EAN)

Check whether the diameter describes the complete transducer or only its diaphragm. Different labels and driver sizes do not establish better sound.

Included and optional cables

Sennheiser HD 650Detachable 3 m unbalanced cable included; 4.4 mm and XLR-4 cables optional

Sennheiser HD 599Detachable; two cables supplied (3 m with 6.3 mm plug, 1.2 m with 3.5 mm plug)

Sources

Sennheiser HD 650

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

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification · The specification table lists the cables as '1: 6.3mm 2: 3.5mm detachable'.

Sennheiser HD 599 — official UK product page and specifications

Check the exact configuration and source conditions for your use.

Rated total harmonic distortion

Sennheiser HD 650≤0.05% at 1 kHz, 1 V rms

Sennheiser HD 599<0.1% (1 kHz, 100 dB SPL)

Sources

Sennheiser HD 650

Manufacturer specification

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

These published limits can use different input voltages, loudness levels and standards. They cannot establish lower distortion in matched listening conditions.

Driver diameter

Sennheiser HD 65042 mm

Sennheiser HD 59938 mm

Sources

Sennheiser HD 650

Manufacturer specification · Complete transducer diameter; the diaphragm is 38 mm.

Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

Check whether the diameter describes the complete transducer or only its diaphragm. Different labels and driver sizes do not establish better sound.

Show 3 more verified differences

Ear pads

Sennheiser HD 650Velour ear pads; replaceable

Sennheiser HD 599Soft, replaceable ear pads on large ear cups

Sources

Sennheiser HD 650

Manufacturer specification · Replacement procedure shown in the manual.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications Sennheiser UK store — HD 599 product variant data (SKU and EAN)

Check the exact configuration and source conditions for your use.

Rated frequency range

Sennheiser HD 65010–41,000 Hz (−10 dB)

Sennheiser HD 59912 Hz – 38.5 kHz

Sources

Sennheiser HD 650

Manufacturer specification · The manual rates 10–41,000 Hz at −10 dB; Sennheiser's UK feature list quotes 12–41,000 Hz without a threshold.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification · No tolerance is stated.

Sennheiser HD 599 — official UK product page and specifications

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

Rated sensitivity

Sennheiser HD 650103 dB SPL at 1 kHz, 1 V rms

Sennheiser HD 599106 dB SPL (1 kHz, 1 Vrms)

Sources

Sennheiser HD 650

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

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

Manufacturer specification · Voltage reference (dB/V), not dB/mW; listed as 'Sound pressure level (SPL)'.

Sennheiser HD 599 — official UK product page and specifications

Keep the frequency and voltage or power reference attached. Sensitivity describes output for an input, not sound quality; dB/V and dB/mW are different measures.

Small physical differences (1)

Weight

Sennheiser HD 650260 g

Sennheiser HD 599250 g

Sources

Sennheiser HD 650

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

Manufacturer specification · Sennheiser does not say whether the figure includes the cable.

Sennheiser HD 599 — official UK product page and specifications

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

Configuration & compatibility details (1)

Wearing style

Sennheiser HD 650Over-ear (circumaural), open-back dynamic headphones

Sennheiser HD 599Over-ear, open-back wired headphones

Sources

Sennheiser HD 650

Manufacturer specification

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

Both sources describe the same wearing style and acoustic design in different words. The extra wording does not establish a different fit; compare the separately listed fields.

Missing or non-comparable evidence (13)

Active noise cancellation

Sennheiser HD 650Not verified

Sennheiser HD 599No

Sources

Sennheiser HD 650

The reviewed exact manufacturer sources establish open-back dynamic construction but do not explicitly state whether active noise cancellation is present or absent. Acoustic mesh, an absorber or an omitted ANC control does not establish ANC=false. · Manufacturer specification

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

Manufacturer specification · The specification table lists 'Active Noise Cancellation: False'; passive open-back headphones.

Sennheiser HD 599 — official UK product page and specifications

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

Microphone

In Visual facts

Sennheiser HD 650Not verified

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

The reviewed exact manufacturer sources do not explicitly establish microphone presence or absence for the supplied configuration. Stereo audio conductors and omitted controls are not proof that no microphone exists. · Manufacturer specification

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

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 599 — official UK product page and specifications

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

Battery life

Sennheiser HD 650Not verified

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

The reviewed exact manufacturer sources do not explicitly give battery life or state that no battery is required for operation. A wired analogue connection is known; the generic disposal wording “battery/rechargeable battery (if applicable)” establishes neither presence nor absence. · Manufacturer specification

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

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 599 — official UK product page and specifications

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

Supplied plug configuration

Sennheiser HD 6506.35 mm unbalanced plug with included 6.35 mm-to-3.5 mm adapter

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification · Needs a matching headphone output.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

No source recorded for this side.

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

Rated contact pressure

Sennheiser HD 650Approximately 6.0 N ±1.0 N

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

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

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

No source recorded for this side.

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

Frequency equalisation

Sennheiser HD 650Diffuse-field equalised

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

No source recorded for this side.

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

In the box

Sennheiser HD 650Not verified

Sennheiser HD 599HD 599 headphones, 3 m cable with 6.3 mm straight plug, 1.2 m cable with 3.5 mm straight plug, 6.3 mm to 3.5 mm adapter

Sources

Sennheiser HD 650

No source recorded for this side.

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

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

Supplied 3.5 mm adapter

Sennheiser HD 650Yes

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification · Manual package contents explicitly includes a 6.35 mm-to-3.5 mm stereo adapter.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

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

Sennheiser HD 650Maximum 500 mW under EN 60-268-7

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification · Maximum input the headphones can handle, not the amplifier power they need.

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

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

Sennheiser HD 6501.8 mT

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification · Static magnetic field at the headphone surface.

Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details

Sennheiser HD 599

No source recorded for this side.

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

Construction

Sennheiser HD 650Not verified

Sennheiser HD 599Ivory colour scheme with brown headband stitching and matte metallic detailing on the ear cups and headband

Sources

Sennheiser HD 650

No source recorded for this side.

Sennheiser HD 599

Manufacturer specification

Sennheiser HD 599 — official UK product page and specifications

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

Operating temperature

Sennheiser HD 650−10 °C to +55 °C

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

Manufacturer specification

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

No source recorded for this side.

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

Replaceable parts

Sennheiser HD 650Detachable cable and replaceable ear pads; headband padding via repair service

Sennheiser HD 599Not verified

Sources

Sennheiser HD 650

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

Sennheiser HD 650 — manufacturer specifications

Sennheiser HD 599

No source recorded for this side.

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

2 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

Sennheiser HD 650

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 599

Select a feature to check your fit.

Feature matching, not a sound-quality score. The specification table links to the evidence for each feature.

WHAT EACH CHOICE ASKS OF YOU

What it brings and what to check

Sennheiser HD 650

What it brings

Its 42 mm dynamic driver has hand-paired transducers matched within ±1 dB, and the supplied 6.35 mm cable with 3.5 mm adapter fits both common socket sizes. The cable and velour ear pads are replaceable.
Manufacturer source Manufacturer source

What to check

At 300 ohms, check that your amplifier or audio source can drive the headphones properly. The documented connection uses the supplied analogue audio cable and 3.5 mm adapter.
Manufacturer source Manufacturer source
Sennheiser describes the intended use as listening at home with high-quality audio systems. The 4.4 mm balanced and XLR-4 cables are optional accessories.
Manufacturer source Manufacturer source

Sennheiser HD 599

What it brings

Two cables are supplied — 3 m with a 6.3 mm straight plug and 1.2 m with a 3.5 mm straight plug — plus a 6.3 mm to 3.5 mm adapter.
Manufacturer source
Sennheiser publishes both the 50 Ω impedance and a 106 dB SPL at 1 V rating, which helps estimate how much output a source needs to drive it.
Manufacturer source
The large ear cups use soft ear pads that Sennheiser describes as replaceable.
Manufacturer source Manufacturer source

What to check

It is an open-back design, and Sennheiser publishes no ambient-noise attenuation figure for it.
Manufacturer source
Sennheiser does not say whether the 250 g weight includes a cable.
Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

26 of 26 specifications Sources in each row

Source-backed specifications for Sennheiser HD 650 and Sennheiser HD 599
Specification	Sennheiser HD 650	Sennheiser HD 599

Wearing styleDifferent Sources Sennheiser HD 650 Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	Over-ear (circumaural), open-back dynamic headphones	Over-ear, open-back wired headphones
WeightDifferent Sources Sennheiser HD 650 Manufacturer specification · Approximate, without the cable. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 Manufacturer specification · Sennheiser does not say whether the figure includes the cable. Sennheiser HD 599 — official UK product page and specifications	260 g	250 g
Acoustic design Sources Sennheiser HD 650 Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	Open-back	Open-back
Replaceable parts Sources Sennheiser HD 650 Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 No source recorded.	Detachable cable and replaceable ear pads; headband padding via repair service	Not provided
Ear padsDifferent Sources Sennheiser HD 650 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications Sennheiser UK store — HD 599 product variant data (SKU and EAN)	Velour ear pads; replaceable	Soft, replaceable ear pads on large ear cups
Rated contact pressure Sources Sennheiser HD 650 Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 No source recorded.	Approximately 6.0 N ±1.0 N	Not provided
Construction Sources Sennheiser HD 650 No source recorded. Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	Not provided	Ivory colour scheme with brown headband stitching and matte metallic detailing on the ear cups and headband

Wired / wireless connectionsDifferent Sources Sennheiser HD 650 Manufacturer specification · Optional 4.4 mm and XLR-4 balanced cables are sold separately. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	Wired analogue; detachable 6.35 mm unbalanced cable and included 3.5 mm adapter	Wired analogue; two cables supplied — 3 m with 6.3 mm straight plug and 1.2 m with 3.5 mm straight plug — plus a 6.3 mm to 3.5 mm adapter
Included cable length Sources Sennheiser HD 650 Manufacturer specification · Length of the supplied cable. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification · Longer of the two supplied cables (6.3 mm plug); the other is 1.2 m with a 3.5 mm plug. Sennheiser HD 599 — official UK product page and specifications	3 m	3 m
Supplied plug configuration Sources Sennheiser HD 650 Manufacturer specification · Needs a matching headphone output. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 No source recorded.	6.35 mm unbalanced plug with included 6.35 mm-to-3.5 mm adapter	Not provided
Included and optional cablesDifferent Sources Sennheiser HD 650 Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification · The specification table lists the cables as '1: 6.3mm 2: 3.5mm detachable'. Sennheiser HD 599 — official UK product page and specifications	Detachable 3 m unbalanced cable included; 4.4 mm and XLR-4 cables optional	Detachable; two cables supplied (3 m with 6.3 mm plug, 1.2 m with 3.5 mm plug)

Nominal impedanceDifferent Sources Sennheiser HD 650 Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load. Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	300 ohm	50 ohm
Rated frequency rangeDifferent Sources Sennheiser HD 650 Manufacturer specification · The manual rates 10–41,000 Hz at −10 dB; Sennheiser's UK feature list quotes 12–41,000 Hz without a threshold. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification · No tolerance is stated. Sennheiser HD 599 — official UK product page and specifications	10–41,000 Hz (−10 dB)	12 Hz – 38.5 kHz
Rated sensitivityDifferent Sources Sennheiser HD 650 Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 Manufacturer specification · Voltage reference (dB/V), not dB/mW; listed as 'Sound pressure level (SPL)'. Sennheiser HD 599 — official UK product page and specifications	103 dB SPL at 1 kHz, 1 V rms	106 dB SPL (1 kHz, 1 Vrms)
Rated long-term input power Sources Sennheiser HD 650 Manufacturer specification · Maximum input the headphones can handle, not the amplifier power they need. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 No source recorded.	Maximum 500 mW under EN 60-268-7	Not provided
Driver constructionDifferent Sources Sennheiser HD 650 Manufacturer specification · The driver, diaphragm and voice-coil sizes describe different parts. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification · Sennheiser says the E.A.R. design channels the audio signal directly into the ears; the specification table gives the transducer size as 38 mm. Sennheiser HD 599 — official UK product page and specifications Sennheiser UK store — HD 599 product variant data (SKU and EAN)	42 mm dynamic transducer with 38 mm diaphragm and aluminium voice coil; acoustic mesh and hand-paired transducers within stated ±1 dB tolerance	38 mm transducer using Sennheiser’s proprietary transducer technology with the E.A.R. (Ergonomic Acoustic Refinement) design
Frequency equalisation Sources Sennheiser HD 650 Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 No source recorded.	Diffuse-field equalised	Not provided
Rated total harmonic distortionDifferent Sources Sennheiser HD 650 Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	≤0.05% at 1 kHz, 1 V rms	<0.1% (1 kHz, 100 dB SPL)
Driver diameterDifferent Sources Sennheiser HD 650 Manufacturer specification · Complete transducer diameter; the diaphragm is 38 mm. Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	42 mm	38 mm

Active noise cancellation Sources Sennheiser HD 650 The reviewed exact manufacturer sources establish open-back dynamic construction but do not explicitly state whether active noise cancellation is present or absent. Acoustic mesh, an absorber or an omitted ANC control does not establish ANC=false. · Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 Manufacturer specification · The specification table lists 'Active Noise Cancellation: False'; passive open-back headphones. Sennheiser HD 599 — official UK product page and specifications	Not listed by the manufacturer	No

Supplied 3.5 mm adapter Sources Sennheiser HD 650 Manufacturer specification · Manual package contents explicitly includes a 6.35 mm-to-3.5 mm stereo adapter. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 No source recorded.	Yes	Not provided
In the box Sources Sennheiser HD 650 No source recorded. Sennheiser HD 599 Manufacturer specification Sennheiser HD 599 — official UK product page and specifications	Not provided	HD 599 headphones, 3 m cable with 6.3 mm straight plug, 1.2 m cable with 3.5 mm straight plug, 6.3 mm to 3.5 mm adapter

Static magnetic field at the surface Sources Sennheiser HD 650 Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 No source recorded.	1.8 mT	Not provided
Operating temperature Sources Sennheiser HD 650 Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 599 No source recorded.	−10 °C to +55 °C	Not provided

Show unverified (2)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Microphone Sources Sennheiser HD 650 The reviewed exact manufacturer sources do not explicitly establish microphone presence or absence for the supplied configuration. Stereo audio conductors and omitted controls are not proof that no microphone exists. · Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 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 599 — official UK product page and specifications	Not listed by the manufacturer	Not listed by the manufacturer
Battery life Sources Sennheiser HD 650 The reviewed exact manufacturer sources do not explicitly give battery life or state that no battery is required for operation. A wired analogue connection is known; the generic disposal wording “battery/rechargeable battery (if applicable)” establishes neither presence nor absence. · Manufacturer specification Sennheiser HD 650 — manufacturer specifications Sennheiser HD 650 — exact UK article and product details Sennheiser HD 599 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 599 — official UK product page and specifications	Not listed by the manufacturer	Not listed by the manufacturer

First product manufacturer source Second product manufacturer source

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Wearing style: Over-ear (circumaural), open-back dynamic headphones

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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.