Field Test · Studio Gear Review
Fostex TH910
An in-depth technical analysis of the Fostex TH910 closed-back headphones
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Spec Sheet
- Wired
- Circumaural
- Closed-back
- Dynamic
- Frequency response: 12.5 Hz – 45,000 Hz
- Impedance: 25 Ohm
- Sensitivity: 100 dB/mW
- 50 mm driver with BioDyna-diaphragm
- Solid maple wood case with traditional Japanese ‘Urushi’ lacquer finish
- Magnesium alloy housing base plate
- Newly shaped ear pads made of silk protein with internal, two-layer, elastic urethane and bevelled surface for optimal fit
- Headband made from natural sheepskin
- Two-sided cable-routing
- Cable length: 2 m
- Unbalanced OFC cable (oxygen-free copper of grade 7N)
- Weight (without cable): 385 g
- Colour: Red
- TH910
- 2 m cable (2x 3.5 mm mini jack headphone side to 1x 6.3mm stereo jack)
- Leather pouch
- Safety instructions
Studio Log
| Available since | November 2025 |
|---|---|
| Item number | 625989 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Closed Back |
| Impedance | 25 Ohms |
| Frequency range | 45000 Hz |
| Adaptor | No |
| Replaceable Cable | Yes |
| Colour | Red |
| Max. SPL | 100 dB |
| Sensitivity | 100 dB |
| Type Of Connector | Jack(stereo) |
| Weight | 385 g |
| Replacable Cable | Yes |
| Marrone/Argento | Red |
Demo Footage
Field Photography
QC Pass — Field Test
Customer Review Summary
Introduction to the Fostex TH910
The Fostex TH910 is a premium wired over-ear headphone, released in November 2025, designed for audiophiles and professionals seeking precise sound reproduction. At £2,699, it targets a high-end market segment with a focus on both acoustic performance and artisanal construction.
Design and Build Quality
One of the most striking aspects of the TH910 is its build, combining modern engineering with traditional craftsmanship. The ear cups feature a solid maple wood case finished with a Japanese ‘Urushi’ lacquer, lending durability and a unique aesthetic. The housing base plate made of magnesium alloy contributes to structural rigidity while maintaining a relatively light weight of 385 grams (excluding the cable).
The headphones use a circumaural, closed-back design intended to provide isolation from external noise. The ear pads represent a technical improvement, consisting of silk protein with an internal, dual-layer elastic urethane foam and a bevelled surface that aims to optimise fit and comfort. The headband made from natural sheepskin adds further comfort for extended sessions.
Acoustic and Electrical Specifications
At the core of the TH910’s sound reproduction capability is the 50 mm driver equipped with a BioDyna-diaphragm. This driver design is expected to deliver precise sound with minimal distortion, though subjective sound quality cannot be detailed here.
- Frequency response: 12.5 Hz to 45,000 Hz, indicating the headphones cover and extend beyond the typical human hearing range (20 Hz to 20 kHz), promising excellent high-frequency detail.
- Impedance: 25 ohms, low enough to be driven by a variety of amplifiers and portable devices without requiring dedicated high-power amplification.
- Sensitivity: 100 dB/mW, which suggests the headphones can reach loud volumes relatively easily, up to a maximum sound pressure level (SPL) of 100 dB.
The combination of these specs points to a product designed for clean, dynamic sound output with a broad frequency range that can faithfully reproduce the finest audio nuances.
Cable and Connectivity
The TH910 utilises a replaceable unbalanced oxygen-free copper (OFC) cable of 2 metres in length, which terminates in two 3.5 mm mini-jack connectors on the headphone side, converging into a 6.3 mm stereo jack for connection to audio sources. This cable can be replaced, which extends the product’s lifespan and offers flexibility in servicing or upgrading cables.
The two-sided cable-routing offers practical wearability and reliability in different use scenarios. However, the absence of an adaptor in the box might require buyers to source one separately depending on their equipment.
Practical Considerations
Weighing 385 grams without the cable, the TH910 remains relatively light for its class, which coupled with its ergonomically designed ear pads and headband aims to maintain comfort over prolonged listening sessions. Its closed-back design is suitable for studio work or focused listening, limiting ambient noise intrusion.
In addition to the headphones and cable, the package includes a leather pouch for storage and safety instructions outlining proper handling and care of this premium device.
Conclusion
The Fostex TH910 is a technically sophisticated headphone that prioritises both sound fidelity and artisanal build quality. Its specialised materials such as solid maple wood and silk protein ear pads paired with advanced driver technology and extensive frequency response mark it as a refined option for discerning listeners. The relatively low impedance and high sensitivity suggest good compatibility with various audio sources. While devoid of modern features like wireless connectivity, its design choices appeal strongly to users valuing traditional headphone craftsmanship and accessible high-end sound performance.
