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Fostex TH909 Reference Headphones


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Found it cheaper? Click here. SKU: FTXTH909
Ex VAT: £1,249.17
TH909 is a flagship open-back alternative to the closed-back TH900 MKII with increased soundfield, altered acoustic circuit design, patented "Biodyna" technology and 1.5 Tesla 50mm driver with repulsion magnet.

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Condition: Brand new in original retail packaging

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Warranty length 2 Years
Brand Fostex

Tech Specs

- Driver: Dynamic, 50mm
- Operation Type: Open back
- Impedance: 25 ohm
- Sensitivity: 100dB/mW (@1kHz)
- Freq response: 5Hz – 45kHz
- Max Input Power: 1,800mW
- Weight: 390g
- Detachable 3m ¼" unbal stereo cable
- Incl: Headphone Stand, Carry Bag

Product Description

Fostex TH909 is a flagship reference headphone based on the renowned TH900Mk2 closed-back model sharing the same incredible sound but increasing the soundfield through an open back construction and adjusted acoustic circuit design.


TH909 offers a broader dynamic range with low distortion via 1.5 Tesla 50mm driver with aversion magnet and patented "Biodyna" technology, consisting of bio-cellulose and inorganic fibre, used for the diaphragm. This accomplishes rich ultra-low frequency, lifelike mid-range and exceptional presence in high-frequency reproduction.


Dual-layer etched metal grills are adopted which differentiate the resonance points and lends to a sleek appearance. The housing cover features Japan Lacquer Bordeaux finish exhibiting the fine craftsmanship of "Sa-kamoto Urushi Factory" established in 1900. New design earpads employ low-resilience padding for a comfortable fit and optimum audio reproduction.


A bespoke 7N grade (99.99999%) high purity OFC unbalanced cable is supplied as standard. It also has a detachable connector facilitating the balanced connection with XLR cable as an optional extra.

Internal wiring also comprises of 7N grade cable and detachable connectors feature rhodium plating for exceptional robustness, abrasion and corrosion resistance. The optional cables for TH900mk2 (ET-H3.0N7BL & ET-H3.0N7UB) also fit the TH909.

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