Home Headphones Sennheiser HD 400 PRO Sennheiser
Released November 2021
The HD 400 PRO are Sennheiser's open-back studio reference headphones with angled 120-ohm transducers, suited to mixing, editing and mastering in home and project studios.
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Type Over-ear
Noise cancelling No
Battery –
With case –
Best codec Wired
Weight 240 g What reviewers say Reviewers agree the headphones stay comfortable through long sessions and sound clear, balanced and accurate enough to mix on, with precise stereo placement. MusicRadar found them not cheap while MusicTech called them good value; Tape Op found the midrange lively and advised checking the low end on speakers, and MusicTech wanted a choice of cable side.
From musicradar.com , musictech.com and tapeop.com
Sound
Type Over-ear
Noise cancelling No
Back Open
Impedance 120 ohms
Bluetooth codecs None (wired)
Drivers Dynamic, open; angled 120-ohm transducers with a polymer-blend diaphragm; 6 Hz – 38 kHz (–10 dB); 110 dB SPL (1 kHz, 1 Vrms) on the spec sheet, 120 dB SPL in the product page's feature list; THD < 0.05% (1 kHz, 90 dB SPL) Battery
Listening time (maker's claim) No battery (wired) Design
Weight 240 g
Headphone cable Yes
Fit and ear tips Circumaural (over-ear), open-back; velour ear pads; replaceable ear pads and components
Works with Detachable single-sided cables, 3 m coiled and 1.8 m straight, each with a 3.5 mm jack plug; 3.5 mm to 6.3 mm adapter
In the box HD 400 PRO headphones, 3 m coiled cable with 3.5 mm jack plug, 1.8 m straight cable, 3.5 mm to 6.3 mm adapter, quick guide, safety guide Pros and cons Pros + Light at 240 g without cable+ 6 Hz to 38 kHz (–10 dB) with THD below 0.05%+ Coiled 3 m and straight 1.8 m cables both in the boxCons − Open back leaks sound and lets outside noise in− Both supplied cables end in 3.5 mm plugs; no balanced cable
