HD 400 PRO Studio Reference Headphones

Built for precision mixing and long-form critical listening, the Sennheiser HD 400 PRO Studio Reference Headphones deliver an open, natural sound that mirrors a professional control room environment. Designed for modern producers, mix engineers, and editors, the HD 400 PRO combines neutral tuning, exceptional comfort, and modular flexibility into a reliable studio tool you can trust for accurate decisions.

Open-Back Design for a True Studio Soundstage

The HD 400 PRO uses open-back circumaural ear cups to create a wide, transparent soundstage with excellent spatial definition. This design allows sound to breathe naturally, making it easier to place instruments, judge stereo imaging, and hear depth and balance without artificial coloration. The result is an honest listening experience that translates well to speakers.

Precision Transducers With Reference Accuracy

At the core of the HD 400 PRO are custom 120-ohm dynamic drivers built with a specialized polymer diaphragm. These transducers deliver exceptional clarity, controlled low end, and smooth, extended highs. Angled driver placement reduces distortion at higher listening levels and enhances stereo perception, giving you confidence when shaping EQ, dynamics, and spatial effects.

Designed for Long Studio Sessions

Comfort is critical during extended work, and the HD 400 PRO excels here. Plush velour ear pads, a padded adjustable headband, and a lightweight chassis reduce pressure and fatigue during long mixing or editing sessions. The circumaural fit provides stability without clamping force, making them suitable for all-day use.

Flexible Cabling and Long-Term Support

The HD 400 PRO includes both a coiled cable for studio mobility and a straight cable for compact setups. A 1/4-inch screw-on adapter ensures compatibility with professional audio interfaces, mixers, and headphone amps. An optional accessory kit is available with replacement ear pads, headband padding, and cables, allowing the headphones to remain studio-ready for years.

The Sennheiser HD 400 PRO is a purpose-built reference headphone for professionals who demand accuracy, comfort, and consistency. Whether mixing, editing, or mastering, it provides a trustworthy window into your sound.

Features

• Neutral, reference-grade sound for professional mixing and editing
• Open-back design delivers a wide, natural soundstage
• Angled transducers reduce distortion and improve spatial accuracy
• Lightweight construction with velour ear pads for extended comfort
• Single-sided detachable cable system for studio flexibility
• Includes both coiled and straight cables

Specs

Type

• Ear coupling: Circumaural
• Operating principle: Dynamic, open
• Primary application: Studio reference
• Secondary application: Home listening

Audio

• Frequency response: 6 Hz to 38 kHz
• Maximum SPL: 110 dB
• Noise cancelling: No

Physical

• Weight: 0.53 lb (without cable)
• Cable types: Coiled and straight
• Cable length: 118.11 inches coiled, 70.87 inches straight
• Connector: 1/8-inch with 1/4-inch adapter
• Built-in microphone: No
• Bluetooth: No