Fostex TH-909 Premium Open-Back Stereo Headphones

MFR: TH-909

Starting at $181/mo

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In the box

Fostex TH-909 Premium Open-Back Stereo Headphones

  • Fostex TH-909 Premium Open-Back Stereo Headphones
  • ST300 Headphone Stand
  • Carrying Bag

From The Wavelength Blog Read more

Fostex TH-909 Premium Open-Back Stereo Headphones

Fostex TH909 is a flagship premium headphone based on the reputed closed type TH900mk2. It features a sound field by adopting open-back construction and adjusting the acoustic circuit design. 

Wider Dynamic Range

These headphones offer a wider dynamic range with low distortion using a 1.5 Tesla 50mm driver with a repulsion magnet.


The proprietary 'Biodyna' technology (bio-cellulose and inorganic fiber admixture) is used as a diaphragm material achieving rich very low frequency, natural mid-range, and especially excellent presence in high-frequency reproduction.


The double-layer structure etching metal grills are used as housing opening, which diversifies the resonance points and offers a gorgeous appearance.


The housing cover uses Japan Lacquer Bordeaux finish manufactured by the craftsmanship of "Sa-kamoto Urushi Factory" established in 1900.

Detachable Connector

Equipped with a detachable connector that supports the balanced connection with optional XLR cable (model ET-H3.0N7BL). Internal wiring also uses 7N grade cable. The detachable connection parts use a rhodium plating finish offering high hardness, excellent abrasion, and corrosion resistance.

Ear Pad

A newly designed ear pad adopts a low-resilience cushion to achieve a comfortable fit and the best audio performance.


Custom made7N grade (99.99999%) high purity OFC (Oxygen Free Copper) unbalanced cable (model ET-H3.0N7UB equivalent) is included as standard.

Optional Cables

The optional cables for TH900mk2, model ET-H3.0N7BL, ET-H3.0N7UB & ET-H1.2N7UB fit the TH909 too.

Wired Connectivity

Cable Length3 meter
Cable DesignDetachable


Weight390g (excluding the cable)


Driver Size50mm
Wearing StyleHeadband

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