Sennheiser HD 400 PRO Open-Back Over-Ear Headphones

Made for pro mixing, editing, and mastering, these Sennheiser open-back headphones deliver transparent, neutral sound in a comfortable, lightweight design.

When working at home or in the studio, you need your mix to sound as it does when your listeners hear it. Sennheiser HD 400 PRO headphones' open-back design provides a natural and accurate listening experience for fine-tuning your signature sound.

The core of the HD 400 PRO is the 120 ohm transducer developed by Sennheiser engineers, featuring a specialized polymer blend in its diaphragm. The drive magnet offers high power while its damping system manages ventilation -- this combination yields deeper bass while mitigating the distortion that otherwise impacts clarity -- a difference professional users will appreciate. This makes the HD 400 PRO a precise monitoring tool which reveals your mix in every detail.

Velour earpads and a distinct lightweight design provide the comfort you need during long sessions. The robust housing endures everyday wear and tear regardless of your application, whether editing, mixing or mastering. A single-sided and coiled cable gives you the freedom to operate. For convenience, a straight cable is also included in the delivery. In addition, open ear cups and angled transducers allow for a wide and transparent soundstage, recreating the optimal listening position found in high-end recording studios. Artifacts of a confined space are a thing of the past. The HD 400 PRO is a true reliable companion for those who put quality and precision above all else.


- A professional's tool with neutral sound reproduction
- Lightweight design for read more all-day usage
- Single-sided, coiled cable allows freedom to operate.
- For convenience, a straight cable is also included
- Angled transducers designed for low distortion at high volume
- SPLs provide a spacious and accurate soundstage
WARNING: Cancer and Reproductive Harm -
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-Acoustic Principle: Dynamic, Open
-Ear Coupling: Circumaural
-Ear Pad Material: Velour
-Jack Plug: 3.5 mm jack plug with 6.3 mm adapter
-Impedance: 120 Ohm
-Frequency Response: 6 Hz to 38 kHz (-10 dB)
-Sound Pressure Level (SPL): 110 dB (1 kHz / 1 V RMS)
-THD, Total Harmonic Distortion: < 0.05 % (1 kHz / 90 dB SPL)
-Weight (w/o cable): 240 g
-Temperature Operation: -15 *C to +55 *C (5 *F to 131 *F)
- Storage: -55 *C to +70 *C (-67 *F to 158 *F)
-Relative Humidity: <= 90 %
-Accessories Included:
- HD 400 PRO Studio Reference Headphone
- 3 m coiled cable with 3.5 mm jack plug
- 3.5 mm jack plug to 6.3 mm adapter
- 1.8 m straight cable
- Quick Guide
- Safety Guide
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 1.5 lbs
Shipping Dimensions: 11 x 8 x 5 in
Manufacturer Part Number (MPN): 700047

For support or warranty questions, please contact the manufacturer:
Phone: 877-736-6434

Reviewers gave this product an overall rating of 3 out of 5 stars. (1 ratings)
Submitted October 9, 2022 by a customer from
"No case"
Overall: 3 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
The headphones are great. But for $249 you would think they would come with a case to store the headphones. Even cheap Sony 7640’s come with a case to protect them. Really poor choice on Sennheiser’s part not to include that protection.
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