Field Test · Studio Gear Review
Fostex TH919
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Spec Sheet
- Wired
- Circumaural
- Open-back design
- 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)
- Colour: Red
- TH919
- 2m cable (2x 3.5mm mini jack headphone side to 1x 6.3mm stereo jack)
- Leather pouch
- Safety instructions
- Weight (without cable): 385 g
Studio Log
| Available since | November 2025 |
|---|---|
| Item number | 626017 |
| Sales Unit | 1 piece(s) |
| Design | Over-Ear |
| System | Open |
| Impedance | 25 Ohms |
| Frequency range | 45000 Hz |
| Adaptor | No |
| Replaceable Cable | Yes |
| Colour | Black/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 TH919
The Fostex TH919 headphones, released in November 2025, position themselves as premium over-ear audio devices combining traditional craftsmanship with modern acoustic engineering. At a price point of £2,845, these wired headphones employ an open-back system aimed at delivering an expansive soundstage and high-fidelity audio reproduction.
Design and Build Quality
The TH919 headphones incorporate a wealth of meticulously selected materials. Most striking is the solid maple wood housing, finished with traditional Japanese ‘Urushi’ lacquer. This artisanal treatment promises a visually distinctive presentation. Complementing this is a magnesium alloy base plate designed to maintain structural integrity while minimizing weight, which stands at a modest 385 grams excluding the cable.
The circumaural ear cups are topped with newly shaped pads made from silk protein, underpinned by an internal two-layer elastic urethane foam. This construction is bevelled to optimise comfort and secure fit around the ear. For the headband, Fostex uses natural sheepskin, lending further comfort for extended listening sessions.
Cable and Connectivity
The headphones come with a two-metre unbalanced OFC (oxygen-free copper, grade 7N) cable featuring a stereo double 3.5mm mini-jack input converging into a single 6.3mm stereo jack output. Cable replacement is supported, which adds an element of future-proofing and ease of maintenance. The two-sided cable routing offers choice in cable orientation, enhancing ergonomic flexibility.
Acoustic Performance Features
The TH919 employs 50 mm dynamic drivers equipped with Fostex’s proprietary BioDyna diaphragms. This technology aims at delivering greater diaphragm responsiveness and clarity across the frequency spectrum.
- Frequency response: from 12.5 Hz to 45,000 Hz, covering both the infrasonic lows and ultrasonics well beyond typical human hearing limits, indicative of a design catering to high-resolution audio enthusiasts.
- Impedance: 25 Ohms, suitable for use with a variety of audio sources, including portable devices and dedicated amplifiers without demanding excessive power.
- Sensitivity: 100 dB/mW, enabling adequate volume levels even with less powerful outputs.
- Maximum SPL: rated at 100 dB, offering substantial dynamic headroom for a controlled listening experience at higher volumes.
Open-Back Design
The open-back architecture supports a natural sound presentation with widened soundstage effects, making these headphones particularly suitable for critical listening rather than isolation in noisy environments. The open design allows air and sound waves to move freely, reducing pressure build-up and ear fatigue.
Additional Considerations
Fostex supplies the TH919 with a red leather pouch, centred on protecting the headphones during transport or storage. Though no adaptor is included, the 6.3mm stereo jack connection is a common standard compatible with a wide range of audio equipment. The red and black colour scheme, coupled with traditional finishing techniques, bridges modern performance with cultural heritage.
Conclusion
Technically, the Fostex TH919 headphones represent a fusion of craftsmanship and high-end audio technology. The bio-dynamic driver system, ultra-wide frequency response, and thoughtfully engineered ergonomics underline Fostex’s focus on delivering a premium listening experience. The open-back format is clearly aimed at those seeking a natural and spacious sound, supported by build materials designed for both comfort and aesthetic distinction. The £2,845 investment is aligned with the careful choice of components and artisanal finishing, positioning the TH919 as a sophisticated option for audiophiles valuing both form and function.
