Fostex TH810 is a closed-back over-ear headphone with a solid acacia wood housing — the closed counterpart to the TH818 and the direct position below the TH910 flagship in Fostex's premium lineup. The component set is identical to the TH818: the 50mm BioDyna driver with an updated voice coil and reinforced diaphragm surround, a magnesium alloy chassis, dual-density urethane foam earpads covered in silk protein synthetic leather, and a natural sheepskin headband. The closed-back architecture differentiates the TH810 from the TH818 acoustically: stronger, more immediate bass response and passive environmental isolation — at the cost of the wider soundstage characteristic of open-back designs. TH810 is the choice for environments where external noise attenuation matters, or where listening cannot take place in complete silence.
Closed architecture and BioDyna driver: controlled bass without box resonance
The 50mm BioDyna transducer in the TH810 is the same updated unit as in the TH818 and TH910 — a bio-cellulose and composite fiber diaphragm at 1.5 T magnetic flux density, with a new voice coil and reinforced surround engineered to reduce distortion and artifacts in the bass range. The closed acoustic chamber builds pressure in a way that typically favors the characteristic resonance issues of closed headphones; Fostex minimizes this deliberately through housing material selection and geometry. Acacia wood replaces the Japanese-lacquered maple of the flagship models — acacia is used in stringed instruments including guitars and ukuleles for its resonant properties, which carry over into the acoustic character of the housing. Every TH810 unit shows individual variation in wood grain, texture, and color, with no effect on acoustic performance. Electrical parameters are identical to the TH818: 25 Ω impedance, 100 dB/mW sensitivity, 1,800 mW maximum input, 12.5 Hz to 40,000 Hz frequency response. Weight is 385 g — approximately 20% lighter than the previous generation due to magnesium alloy use in the headband and yoke assembly.
Comfort materials and cabling: sheepskin, silk protein leather and 7N OFC
The headband pad is covered in natural sheepskin leather. Earpads are built from dual-density urethane foam covered in silk protein synthetic leather — softer and more peel-resistant than standard PU, with a more natural feel against skin during extended sessions. The included cable is 3.5mm with 7N oxygen-free copper conductors and a 6.3mm adapter in the box. The detachable cable connector uses rhodium-plated contacts. Balanced connection is supported via the separately purchased XLR cable (ET-H3.0N7BL). Manufactured in Japan.
KEY FEATURES
- Closed-back over-ear design — environmental isolation, stronger bass, focused soundstage
- 50mm BioDyna driver: bio-cellulose diaphragm, updated voice coil, reinforced surround, 1.5 T magnetic flux density
- All components except housing identical to flagship TH910 and sibling TH818
- Solid acacia wood housing — natural grain and color variation per individual unit
- Magnesium alloy headband and yoke: approx. 20% weight reduction vs. previous generation
- Earpads: dual-density urethane foam + silk protein synthetic leather
- Headband pad: natural sheepskin leather
- Detachable cable: 3.5mm / 7N OFC + 6.3mm adapter included
- Balanced XLR connection supported via ET-H3.0N7BL cable (sold separately)
- Detachable connector with rhodium-plated contacts
- Manufactured in Japan
TECHNICAL SPECIFICATIONS
- Type: closed-back, over-ear
- Driver: 50mm BioDyna (bio-cellulose + composite fibers), 1.5 T magnetic flux density
- Frequency response: 12.5 Hz – 40,000 Hz
- Impedance: 25 Ω
- Sensitivity: 100 dB/mW
- Maximum input power: 1,800 mW
- Weight: 385 g (without cable)
- Housing: solid acacia wood
- Headband / yoke: magnesium alloy
- Earpads: dual-density urethane foam + silk protein synthetic leather
- Headband pad: natural sheepskin leather
- Included cable: 3.5mm, 7N OFC + 6.3mm adapter
- Balanced cable: XLR ET-H3.0N7BL (sold separately)
- Cable connector: detachable, rhodium-plated contacts
- Availability: from late April 2026
