GMP 400

The GMP 400 is the flagship of our headphone line, an open-back masterpiece engineered for the most demanding audiophiles and professional sound engineers. It delivers an uncompromising listening experience, revealing every detail with crystal-clear highs, a richly textured mid-range, and a precise, dynamic bass response.

Precision Audio for Critical Listening

The open-back earcups produce an exceptionally wide and natural soundstage, perfect for the precise spatial positioning required in mixing and mastering. At its heart, the GMP 400 features premium components like a unique sandwich-diaphragm and copper-plated aluminum voice coils. For long sessions, comfort is paramount; a cardamatic suspension provides a self-adjusting fit, while plush velvet earpads ensure hours of fatigue-free listening.

Authentic German Manufacturing

Every pair of GMP 400 headphones is proudly designed, engineered, and assembled by our team in our own factory in Obrigheim, Germany. This commitment to in-house manufacturing ensures we meet the absolute highest standards of quality, precision, and durability.

Technical Specifications

• Headphone Type: Open-back
• Driver Type: Dynamic
• Nominal Impedance: 300 Ω
• Frequency Response: 14 – 24,100 Hz
• THD Harmonic Distortion: 0.07% (1 mW / 1 kHz)
• Sound Pressure Level (SPL): 98 dB (1 mW / 1 kHz)
• Load Rating: 100 mW
• Contact Pressure: ~3 N
• Weight w/o Cable: 240 g
• Earpads: Soft Velvet
• Cable: Straight cable 9ft10in (3m)
• Connector: Gold-plated straight Jack 3.5 / 6.3 mm