Field Test · Studio Gear Review
Fostex TH-900 mk2LE
A technical examination of Fostex’s closed-back TH-900 mk2LE headphones
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Spec Sheet
- Circumaural
- Closed-back design
- Dynamic
- Frequency range: 5 – 45,000 Hz
- Imepdance: 25 Ohm
- Sensitivity: 100 dB/mW
- Maximum input: 1,800 mW
- Driver: 50 mm neodymium driver with “Bio-Dynamic” diaphragm
- Neodymium magnet drive with 1.5 Tesla magnetic flux density
- Foster / Fostex “Biodyna” diaphragm for finely detailed high audio resolution and sound reproduction
- Housing made from Mizume Cherry, a premium wood species native to Japan, derived from a variety of the Japanese birch with excellent acoustic properties
- Traditional Urushi lacquer finish applied by hand
- Ear pads made from protein leather (derived from eggshell membranes)
- Detachable, smooth 2 m cable with 6.3 mm jack
- Cable made of 7N OFC copper (99.99%) and robust plug housing made of duralumin
- Weight: 390 g (without cable)
- Includes carry pouch
Studio Log
| Available since | March 2026 |
|---|---|
| Item number | 639566 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Closed Back |
| Impedance | 25 Ohms |
| Frequency range | 5 Hz – 45000 Hz |
| Adaptor | No |
| Replaceable Cable | Yes |
| Colour | Black/Red |
| Sensitivity | 100 dB |
| Max. SPL | 100 dB |
| Type Of Connector | Jack |
| Weight | 388 g |
| Replacable Cable | Yes |
| Marrone/Argento | Red |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
Introduction
The Fostex TH-900 mk2LE represents a refined iteration of a high-end closed-back headphone, blending advanced materials with innovative driver technology. Released in March 2026, this model targets audiophiles seeking both superior sound quality and exquisite craftsmanship. Priced at £1,555, the TH-900 mk2LE stands out through its use of premium wood and carefully selected electronic components.
Design and Build Quality
These headphones feature an over-ear, circumaural configuration employing a closed-back system to provide sound isolation. Notable is the housing fashioned from Mizume Cherry, a rare Japanese birch variety prized for its acoustic clarity. This wooden enclosure impacts sound dampening and resonance control.
The exterior is finished with traditional hand-applied Urushi lacquer, a technique that requires meticulous craftsmanship and enhances durability. The ear pads utilise protein leather derived from eggshell membranes, offering a plush, breathable surface, potentially improving comfort during extended listening sessions.
Weighing approximately 390 grams without the detachable cable, the headphones maintain a balance between solid construction and manageable weight. The cable itself is constructed from high-purity 7N oxygen-free copper (99.99%), ensuring minimal signal loss and interference. Its length extends to two metres, terminating in a 6.3mm jack compatible with standard high-fidelity audio equipment. The plug casing is made from robust duralumin metal, underlining durability.
Technical Specifications and Audio Performance Potential
- Driver: 50mm neodymium with Bio-Dynamic diaphragm
- Frequency Range: 5 Hz, 45,000 Hz
- Impedance: 25 Ohms
- Sensitivity: 100 dB/mW
- Maximum Input Power: 1,800 mW
- Maximum Sound Pressure Level (SPL): 100 dB
The 50 mm drivers employ a Bio-Dynamic diaphragm, a proprietary design that aims to deliver finely detailed audio resolution and accurate sound reproduction. The inclusion of a neodymium magnet with a magnetic flux density of 1.5 Tesla suggests a highly efficient driver capable of precise transient response and dynamic range.
The frequency response of 5 Hz to 45,000 Hz extends well beyond the human hearing range, promising excellent reproduction of overtones and harmonics essential for a rich and nuanced listening experience. The impedance value at 25 Ohms facilitates compatibility with a wide range of audio sources, including portable devices without requiring additional amplification.
Sensitivity of 100 dB/mW indicates that the headphones can achieve substantial volume even at modest power levels. The maximum power handling of 1,800 mW further enhances their capability to perform without distortion at higher output levels.
Cable and Connectivity
The detachable nature of the supplied cable provides versatility and longevity, allowing replacement without servicing the headphones themselves. The cable’s construction from 99.99% pure oxygen-free copper ensures low resistance and minimal degradation of the audio signal. The durable duralumin housing on the plug is designed to withstand frequent connections and disconnections, an important feature for professional and home use alike.
Additional Features
Included with the TH-900 mk2LE is a carry pouch, facilitating safe transport and storage. This accessory supports the premium positioning of the headphones, catering to buyers who prioritise both protection and presentation.
Conclusion
The Fostex TH-900 mk2LE offers an impressive combination of engineering and artisanal design. The choice of Mizume Cherry wood and Urushi lacquer finish is exceptional within the headphone market, contributing to both acoustic refinement and distinctive aesthetics. Technical specifications suggest a device capable of delivering a broad, precise frequency response paired with efficient power handling and sensitivity.
This model appears well suited to audiophiles seeking a closed-back headphone with both sonic detail and isolation capabilities. Its modest impedance encourages compatibility with diverse audio gear, while the detachable high-purity cable and solid mechanical build promise durability. The TH-900 mk2LE exemplifies a product where material quality and driver innovation converge, offering a distinct listening experience grounded in technical sophistication.
