HEADPHONES · YOUR NEXT FACE-OFF

Beyerdynamic DT 990 PRO 250 ohm vs Sennheiser HD 400 PRO

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

Compared products

YOUR FIRST CHOICE

Beyerdynamic DT 990 PRO 250 ohm

459038 · 250 ohm · coiled cable

Full product profile Official image

Exact model & source notes

The DT 990 PRO in its 250-ohm version (article 459038) is beyerdynamic's open-back, around-ear wired studio headphone with a fixed, single-sided 3 m coiled cable, a 3.5 mm plug and a 6.35 mm adapter. It is passive, has no microphone and is intended for listening and editing rather than for isolation; it works with beyerdynamic's free HEADPHONE LAB plug-in.

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 Beyerdynamic DT 990 PRO 250 ohm for

Higher stated nominal impedance: 250 ohm vs 120 ohm
Longer stated cable length: 3 m vs 1.8 m

Choose the Sennheiser HD 400 PRO for

Lower stated nominal impedance: 120 ohm vs 250 ohm

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

See the 10 verified differences

THE CONTENDER

Sennheiser HD 400 PRO

700047 · HD 400 PRO · wired

Full product profile Official image

Exact model & source notes

The HD 400 PRO (article 700047) is Sennheiser's open-back, around-ear wired studio headphone. It uses angled 120 Ω dynamic transducers with a polymer-blend diaphragm, velour ear pads and a detachable single-sided cable, and both a 3 m coiled and a 1.8 m straight cable come in the box. It weighs 240 g without the cable. Sennheiser lists a two-year warranty.

Specifications checked 27 Sept 2026.

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

Manufacturer specifications

Beyerdynamic DT 990 PRO 250 ohm UK & US retailers

UK & US price history: no verified listing yet

Sennheiser HD 400 PRO 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.

Beyerdynamic DT 990 PRO 250 ohm250 Ω

Manufacturer specification · Nominal impedance; a 250-ohm load needs a source or headphone amplifier able to drive it.

Source 1 Source 2

Sennheiser HD 400 PRO120 Ω

Source 1 Source 2

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 ↓

10 verified differences, most decision-relevant first. 2 are also drawn in Visual facts above. Missing information stays separate.

Wired / wireless connections

Beyerdynamic DT 990 PRO 250 ohmWired; fixed (non-detachable) single-sided 3 m coiled cable with 3.5 mm stereo mini-jack and 6.35 mm (1/4-inch) adapter

Sennheiser HD 400 PROWired; detachable single-sided cable: 3 m coiled cable with 3.5 mm jack plug and a 1.8 m straight cable supplied, plus a 3.5-to-6.3 mm adapter

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · beyerdynamic's FAQ on the product page states that the classic DT models, naming the DT 990 PRO, have fixed cables, whereas PRO X models come with detachable cables. The 80-ohm model (718173) has a straight cable instead; this record is the 250-ohm coiled-cable model.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification · Replacement coiled and straight cables are listed as spare parts.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

Check the exact configuration and source conditions for your use.

Nominal impedance

In Visual facts

Beyerdynamic DT 990 PRO 250 ohm250 ohm

Sennheiser HD 400 PRO120 ohm

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Nominal impedance; a 250-ohm load needs a source or headphone amplifier able to drive it.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

Check the exact configuration and source conditions for your use.

Driver construction

Beyerdynamic DT 990 PRO 250 ohmDynamic

Sennheiser HD 400 PROAngled 120-ohm dynamic transducers with a polymer-blend diaphragm

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Driver diameter is not published in the sources read.

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification · Sennheiser does not state the transducer diameter on the pages and documents read.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Cable length

In Visual facts

Beyerdynamic DT 990 PRO 250 ohm3 m

Sennheiser HD 400 PRO1.8 m

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Coiled cable; length as stated by beyerdynamic.

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification · Supplied straight cable. A separate 3 m coiled cable is also supplied; the source does not specify whether its length is relaxed or extended.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

Check the exact configuration and source conditions for your use.

Supplied plug and adapter

Beyerdynamic DT 990 PRO 250 ohmGold-plated 3.5 mm stereo mini-jack with 6.35 mm (1/4-inch) adapter

Sennheiser HD 400 PRO3.5 mm jack plug with 6.3 mm adapter

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)Sennheiser HD 400 PRO — instruction manual (09/2022)

Check the exact configuration and source conditions for your use.

Rated total harmonic distortion

Beyerdynamic DT 990 PRO 250 ohm<0.2%

Sennheiser HD 400 PRO<0.05% at 1 kHz, 90 dB SPL

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Show 4 more verified differences

Earpads

Beyerdynamic DT 990 PRO 250 ohmVelour, circumaural, replaceable (spare part EDT 990 V)

Sennheiser HD 400 PROVelour; replaceable

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

Check the exact configuration and source conditions for your use.

Rated frequency range

Beyerdynamic DT 990 PRO 250 ohm5–35,000 Hz

Sennheiser HD 400 PRO6–38,000 Hz (−10 dB)

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Rated sensitivity

Beyerdynamic DT 990 PRO 250 ohm96 dB nominal SPL

Sennheiser HD 400 PRO110 dB SPL (1 kHz, 1 Vrms)

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · beyerdynamic does not state the reference (per mW or per V) in these sources; specifications are stated according to EN 60 268-7.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification · The specification sheet states 110 dB (1 kHz / 1 V RMS). The UK page technical table labels the same conditioned figure Max. sound pressure level; this record preserves the voltage-referenced claim without independently certifying a maximum. The separate 120 dB feature statement gives no reference and is not assumed to use these test conditions.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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.

Serviceability

Beyerdynamic DT 990 PRO 250 ohmEvery part serviceable; ear pads (EDT 990 V) and headband pad (BN 59-53/D) listed as replacement parts

Sennheiser HD 400 PROReplaceable ear pads and components; ear pads, coiled cable and straight cable listed as spare parts

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Product page: 'And if something does need replacing – every part is serviceable.' Its FAQ adds that all models are designed for long-term use thanks to their replaceable components. The spec sheet lists replacement parts EDT 990 V (ear pads, velours, circumaural, order # 926.679) and BN 59-53/D (headband pad, order # 990.681).

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data

Check the exact configuration and source conditions for your use.

Small physical differences (1)

Weight without cable

Beyerdynamic DT 990 PRO 250 ohm250 g

Sennheiser HD 400 PRO240 g

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Headphones without cable, per the product pages' technical data ('Weight headphones without cable 250 g'). The same product pages state 'Weighing just 375 grams including the cable' (recorded separately as weight including cable), and the 08.22 spec sheet lists 370 g for the 250-ohm version without stating whether the cable is included.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO, 250 Ohms — official North America store page and technical data beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

Manufacturer specification · Without cable, per the specification sheet and manual; the product page gives the same 240 g without stating a basis.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)Sennheiser HD 400 PRO — instruction manual (09/2022)

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

Missing or non-comparable evidence (13)

Active noise cancellation

Beyerdynamic DT 990 PRO 250 ohmNo

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Passive, open-back design; no active noise cancellation is listed, and open-back headphones let outside sound through.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)

Sennheiser HD 400 PRO

The complete exact sources establish an open dynamic wired design but do not explicitly negate active noise cancellation. Open construction and omission of ANC do not establish a false capability. · Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Microphone

In Visual facts

Beyerdynamic DT 990 PRO 250 ohmNo

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Stereo headphone plug; no microphone or remote is listed.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

The complete exact sources list the headphone and accessories but do not explicitly establish absence of a microphone. An omitted microphone and a stereo headphone plug alone cannot become a sourced false capability. · Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Battery life

Beyerdynamic DT 990 PRO 250 ohmNot required: passive wired headphones powered by the audio source

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Passive headphones with no battery or charging.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

The retained exact sources do not explicitly establish battery life or that no battery is required for operation. Do not infer a not-applicable operating requirement from analogue/dynamic construction or a battery-included No row. · Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data

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

Cable arrangement

Beyerdynamic DT 990 PRO 250 ohmNot verified

Sennheiser HD 400 PRODetachable, single-sided cable; coiled 3 m and straight 1.8 m cables supplied

Sources

Beyerdynamic DT 990 PRO 250 ohm

No source recorded for this side.

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Coiled cable rated length

Beyerdynamic DT 990 PRO 250 ohmNot verified

Sennheiser HD 400 PRO3 m

Sources

Beyerdynamic DT 990 PRO 250 ohm

No source recorded for this side.

Sennheiser HD 400 PRO

Manufacturer specification · Separate supplied coiled cable. The source states 3 m but does not establish its relaxed/extended measurement basis. A 1.8 m straight cable is also supplied.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Frequency characteristic

Beyerdynamic DT 990 PRO 250 ohmDiffuse-field

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Spec sheet feature: 'Open diffuse field studio headphones'.

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

No source recorded for this side.

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

Nominal headband pressure

Beyerdynamic DT 990 PRO 250 ohmApprox. 3.5–5.5 N

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · The current product page gives a 3.5–5.5 N range; the 08.22 spec sheet gives approx. 3.5 N.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

No source recorded for this side.

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

HEADPHONE LAB software

Beyerdynamic DT 990 PRO 250 ohmSupported through a separate DAW plug-in

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Free plug-in for DAW software (VST3, AU and AAX for Windows and macOS) with crossfeed and optional room simulation; there is no standalone version. beyerdynamic's FACTORY CALIBRATION list names other models, not this DT 990 PRO.

beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic HEADPHONE LAB — plug-in features, formats and FACTORY CALIBRATION model list

Sennheiser HD 400 PRO

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

Beyerdynamic DT 990 PRO 250 ohmNot verified

Sennheiser HD 400 PROHD 400 PRO headphones, 3 m coiled cable with 3.5 mm jack plug, 3.5 mm to 6.3 mm adapter, 1.8 m straight cable, quick guide, safety guide

Sources

Beyerdynamic DT 990 PRO 250 ohm

No source recorded for this side.

Sennheiser HD 400 PRO

Manufacturer specification

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Operating temperature

Beyerdynamic DT 990 PRO 250 ohmNot verified

Sennheiser HD 400 PRO−15 °C to +55 °C

Sources

Beyerdynamic DT 990 PRO 250 ohm

No source recorded for this side.

Sennheiser HD 400 PRO

Manufacturer specification · Relative humidity up to 90%.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)

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

Power handling

Beyerdynamic DT 990 PRO 250 ohm100 mW

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification

beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22)

Sennheiser HD 400 PRO

No source recorded for this side.

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

Advertised SPL without stated reference

Beyerdynamic DT 990 PRO 250 ohmNot verified

Sennheiser HD 400 PRO120 dB SPL

Sources

Beyerdynamic DT 990 PRO 250 ohm

No source recorded for this side.

Sennheiser HD 400 PRO

Manufacturer specification · UK page feature statement. Frequency, input voltage/power and measurement reference are not stated; the 120 dB claim is not labelled maximum. Do not compare it numerically with the specifically conditioned 110 dB at1 kHz/1 Vrms claim or use it as a comparable sensitivity/maximum-output input.

Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data

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

Weight including cable

Beyerdynamic DT 990 PRO 250 ohm375 g

Sennheiser HD 400 PRONot verified

Sources

Beyerdynamic DT 990 PRO 250 ohm

Manufacturer specification · Including the cable, per the product pages ('Weighing just 375 grams including the cable'). The 08.22 spec sheet lists 370 g for the 250-ohm version without stating whether the cable is included; the product pages' technical data gives 250 g without cable.

Sennheiser HD 400 PRO

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

Beyerdynamic DT 990 PRO 250 ohm

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 400 PRO

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

Beyerdynamic DT 990 PRO 250 ohm

What it brings

Replaceable velour ear pads and a headband pad are listed as spare parts, so the wearing parts can be renewed rather than replacing the headphones.
Manufacturer source Manufacturer source
The single-sided coiled cable ends in a gold-plated 3.5 mm plug with a 1/4-inch (6.35 mm) adapter, and beyerdynamic says the single-sided cable makes the headphones easier to handle when they are constantly put on and taken off.
Manufacturer source Manufacturer source

What to check

At 250 ohms nominal impedance, phones and laptop outputs may not drive it to a comfortable level; beyerdynamic also lists an 80-ohm version (718173) of the same model.
Manufacturer source Manufacturer source
The open-back design lets sound in and out, and there is no microphone, so it is unsuited to noisy places, recording next to a microphone or calls.
Manufacturer source Manufacturer source
The cable is fixed rather than detachable: beyerdynamic states that its classic DT models, including the DT 990 PRO, have fixed cables, whereas its PRO X models come with detachable cables.
Manufacturer source

Sennheiser HD 400 PRO

What it brings

Two cables come in the box — a 3 m coiled cable and a 1.8 m straight cable — plus a 3.5-to-6.3 mm adapter, so desk and studio setups are covered without buying accessories.
Manufacturer source Manufacturer source
Angled 120-ohm dynamic transducers use a polymer-blend diaphragm, and the headphones weigh 240 g without the cable.
Manufacturer source Manufacturer source
Ear pads and both cable types are listed as replaceable spare parts.
Manufacturer source

What to check

It uses an open acoustic principle, and Sennheiser publishes no ambient-noise attenuation figure for it.
Manufacturer source Manufacturer source
The specification sheet gives 110 dB SPL at 1 kHz / 1 V RMS. A separate feature statement gives 120 dB SPL without a measurement reference, so the two figures cannot be treated as the same test. The transducer diameter is not stated.
Manufacturer source Manufacturer source
The supplied cables use a 3.5 mm plug, with a 6.3 mm adapter included in the box.
Manufacturer source Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

26 of 26 specifications Sources in each row

Source-backed specifications for Beyerdynamic DT 990 PRO 250 ohm and Sennheiser HD 400 PRO
Specification	Beyerdynamic DT 990 PRO 250 ohm	Sennheiser HD 400 PRO

Wearing style Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Over-ear (circumaural), open-back wired studio headphones	Over-ear (circumaural), open-back wired studio headphones
Weight without cableDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Headphones without cable, per the product pages' technical data ('Weight headphones without cable 250 g'). The same product pages state 'Weighing just 375 grams including the cable' (recorded separately as weight including cable), and the 08.22 spec sheet lists 370 g for the 250-ohm version without stating whether the cable is included. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO, 250 Ohms — official North America store page and technical data beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification · Without cable, per the specification sheet and manual; the product page gives the same 240 g without stating a basis. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)Sennheiser HD 400 PRO — instruction manual (09/2022)	250 g	240 g
Weight including cable Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Including the cable, per the product pages ('Weighing just 375 grams including the cable'). The 08.22 spec sheet lists 370 g for the 250-ohm version without stating whether the cable is included; the product pages' technical data gives 250 g without cable. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO, 250 Ohms — official North America store page and technical data beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO No source recorded.	375 g	Not provided
Acoustic design Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Open-back	Open-back
Nominal headband pressure Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · The current product page gives a 3.5–5.5 N range; the 08.22 spec sheet gives approx. 3.5 N. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO No source recorded.	Approx. 3.5–5.5 N	Not provided
EarpadsDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Velour, circumaural, replaceable (spare part EDT 990 V)	Velour; replaceable
ServiceabilityDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Product page: 'And if something does need replacing – every part is serviceable.' Its FAQ adds that all models are designed for long-term use thanks to their replaceable components. The spec sheet lists replacement parts EDT 990 V (ear pads, velours, circumaural, order # 926.679) and BN 59-53/D (headband pad, order # 990.681). beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data	Every part serviceable; ear pads (EDT 990 V) and headband pad (BN 59-53/D) listed as replacement parts	Replaceable ear pads and components; ear pads, coiled cable and straight cable listed as spare parts

Wired / wireless connectionsDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · beyerdynamic's FAQ on the product page states that the classic DT models, naming the DT 990 PRO, have fixed cables, whereas PRO X models come with detachable cables. The 80-ohm model (718173) has a straight cable instead; this record is the 250-ohm coiled-cable model. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification · Replacement coiled and straight cables are listed as spare parts. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Wired; fixed (non-detachable) single-sided 3 m coiled cable with 3.5 mm stereo mini-jack and 6.35 mm (1/4-inch) adapter	Wired; detachable single-sided cable: 3 m coiled cable with 3.5 mm jack plug and a 1.8 m straight cable supplied, plus a 3.5-to-6.3 mm adapter
Battery life Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Passive headphones with no battery or charging. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO The retained exact sources do not explicitly establish battery life or that no battery is required for operation. Do not infer a not-applicable operating requirement from analogue/dynamic construction or a battery-included No row. · Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data	Not required: passive wired headphones powered by the audio source	Not listed by the manufacturer
Cable lengthDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Coiled cable; length as stated by beyerdynamic. beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification · Supplied straight cable. A separate 3 m coiled cable is also supplied; the source does not specify whether its length is relaxed or extended. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	3 m	1.8 m
Supplied plug and adapterDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)Sennheiser HD 400 PRO — instruction manual (09/2022)	Gold-plated 3.5 mm stereo mini-jack with 6.35 mm (1/4-inch) adapter	3.5 mm jack plug with 6.3 mm adapter
Cable arrangement Sources Beyerdynamic DT 990 PRO 250 ohm No source recorded. Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Not provided	Detachable, single-sided cable; coiled 3 m and straight 1.8 m cables supplied
Coiled cable rated length Sources Beyerdynamic DT 990 PRO 250 ohm No source recorded. Sennheiser HD 400 PRO Manufacturer specification · Separate supplied coiled cable. The source states 3 m but does not establish its relaxed/extended measurement basis. A 1.8 m straight cable is also supplied. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Not provided	3 m

Driver constructionDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Driver diameter is not published in the sources read. beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification · Sennheiser does not state the transducer diameter on the pages and documents read. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Dynamic	Angled 120-ohm dynamic transducers with a polymer-blend diaphragm
Nominal impedanceDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Nominal impedance; a 250-ohm load needs a source or headphone amplifier able to drive it. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	250 ohm	120 ohm
Rated frequency rangeDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	5–35,000 Hz	6–38,000 Hz (−10 dB)
Frequency characteristic Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Spec sheet feature: 'Open diffuse field studio headphones'. beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO No source recorded.	Diffuse-field	Not provided
Rated sensitivityDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · beyerdynamic does not state the reference (per mW or per V) in these sources; specifications are stated according to EN 60 268-7. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification · The specification sheet states 110 dB (1 kHz / 1 V RMS). The UK page technical table labels the same conditioned figure Max. sound pressure level; this record preserves the voltage-referenced claim without independently certifying a maximum. The separate 120 dB feature statement gives no reference and is not assumed to use these test conditions. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	96 dB nominal SPL	110 dB SPL (1 kHz, 1 Vrms)
Rated total harmonic distortionDifferent Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	<0.2%	<0.05% at 1 kHz, 90 dB SPL
Power handling Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO No source recorded.	100 mW	Not provided
Advertised SPL without stated reference Sources Beyerdynamic DT 990 PRO 250 ohm No source recorded. Sennheiser HD 400 PRO Manufacturer specification · UK page feature statement. Frequency, input voltage/power and measurement reference are not stated; the 120 dB claim is not labelled maximum. Do not compare it numerically with the specifically conditioned 110 dB at1 kHz/1 Vrms claim or use it as a comparable sensitivity/maximum-output input. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data	Not provided	120 dB SPL

Microphone Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Stereo headphone plug; no microphone or remote is listed. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic DT 990 PRO — spec sheet E1/DT 990 PRO (08.22) Sennheiser HD 400 PRO The complete exact sources list the headphone and accessories but do not explicitly establish absence of a microphone. An omitted microphone and a stereo headphone plug alone cannot become a sourced false capability. · Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	No	Not listed by the manufacturer
Active noise cancellation Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Passive, open-back design; no active noise cancellation is listed, and open-back headphones let outside sound through. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store) Sennheiser HD 400 PRO The complete exact sources establish an open dynamic wired design but do not explicitly negate active noise cancellation. Open construction and omission of ANC do not establish a false capability. · Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	No	Not listed by the manufacturer

HEADPHONE LAB software Sources Beyerdynamic DT 990 PRO 250 ohm Manufacturer specification · Free plug-in for DAW software (VST3, AU and AAX for Windows and macOS) with crossfeed and optional room simulation; there is no standalone version. beyerdynamic's FACTORY CALIBRATION list names other models, not this DT 990 PRO. beyerdynamic DT 990 PRO, 250 Ohms — official product page and technical data (global store)beyerdynamic HEADPHONE LAB — plug-in features, formats and FACTORY CALIBRATION model list Sennheiser HD 400 PRO No source recorded.	Supported through a separate DAW plug-in	Not provided

In the box Sources Beyerdynamic DT 990 PRO 250 ohm No source recorded. Sennheiser HD 400 PRO Manufacturer specification Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Not provided	HD 400 PRO headphones, 3 m coiled cable with 3.5 mm jack plug, 3.5 mm to 6.3 mm adapter, 1.8 m straight cable, quick guide, safety guide

Operating temperature Sources Beyerdynamic DT 990 PRO 250 ohm No source recorded. Sennheiser HD 400 PRO Manufacturer specification · Relative humidity up to 90%. Sennheiser HD 400 PRO (article 700047) — official UK product page and technical data Sennheiser HD 400 PRO — product specification sheet (EN, V1.0)	Not provided	−15 °C to +55 °C

First product manufacturer source Second product manufacturer source

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