Fostex TH919 Open-Back BioDyna Headphones

TH919 Open-Back BioDyna Headphones — Flagship BioDyna Resolution, Open to the Room

The TH919 is the open-back counterpart to the TH910 and a complete evolution of Fostex’s lacquered flagship platform. A newly developed 50 mm BioDyna driver, magnesium-alloy mechanism and acoustically open hard-maple housings create a broad, clear presentation with low-frequency depth and exceptional visibility through the midrange.

A revised driver edge improves excursion stability and bass control, while lower unwanted resonance helps preserve natural tone and separation. The open-back structure expands the stage around that high-density driver, and the traditional lacquer finish makes each pair as tactile and distinctive as it is technically ambitious.

Every Detail Matters

• New-generation 50 mm BioDyna dynamic driver
• Open-back hard-maple housings with traditional lacquer finish
• Lightweight magnesium-alloy structural parts
• Detachable dual-entry 7N-grade OFC cable

Key Specifications

• Type: Open-back dynamic
• Driver: 50 mm neodymium / BioDyna diaphragm
• Impedance: 25 Ω
• Sensitivity: 100 dB/mW
• Maximum input: 1,800 mW
• Frequency response: 12.5 Hz–45 kHz
• Weight: Approximately 385 g, excluding cable

System Pairing

These are revealing full-size headphones. A capable headphone amplifier will provide the current reserve, control and low noise needed to hear their full dynamic range. Contact PPA if you would like help matching them to your source or amplifier.

What’s in the Box

• TH919 headphones
• 2 m 7N-grade OFC unbalanced cable
• Synthetic-leather pouch
• Manufacturer documentation

Authorized Canadian Fostex Dealer
Princess Pasta Audio supplies genuine Canadian-market Fostex products with authorized dealer support. Available on order; ships within 10 business days.