Fostex TH-909 Premium Headphones

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Fostex TH909 stereo headphones maintain the sound characteristic of the TH900mk2 with the expanded sound field of an open-back design and an adjusted acoustic circuit.

Main Features

The TH909 offers a wider dynamic range and low distortion, utilizing a 1.5 Tesla 50mm driver with repulsion magnets.

The diaphragm is constructed from Biodynina, a material composed of bio-cellulose and inorganic fiber admixture. This diaphragm design accomplishing rich low-end frequencies, natural mid-range, and an especially excellent presence in high-frequency production.

The housing features a double-layer structure composed of etching metal, diversifying the resonance points and presenting a gorgeous appearance. It is finished with a Japan Lacquer in Bordeaux manufactured by the Sakamoto Urushi factory, established 110 years ago.

The TH909 includes a detachable 7N grade (99.999999%) high-purity OFC (Oxygen Free Copper) unbalanced cable (ET-H3.0N7UB) featuring a plug sleeve made of durable duralumin and rhodium-plated connections. Interior wiring is also constructed from 7N grade materials.

The newly-designed earpad uses a low-resilience cushion for a more comfortable fit.

Detachable connection parts use rhodium plating finish offering high hardness and excellent resistance to abrasion and corrosion.


Dynamic, 50mm
Operation Type
Open back
25 ohm
100dB/mW (at 1kHz, 1mW)
Freq. response
5Hz – 45kHz
Max Input Power
390g (excluding the cable)
Detachable 3m 1/4” unbalanced stereo phone (model ET-H3.0N7UB)

Included in Package

  • Headphones
  • Detachable cable
  • Headphone Stand (model ST300)
  • Carrying Bag

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
The sound signature changes over time
My initial impression was how the low impedance requirement enables many matching options. A small amp, even a phone, will drive these. This not for the Bose of heart. The TH-909 might be appreciated by someone who uses one amp for Bach and another amp for Lars Danielsson. I've read of people using monster amps and not enjoying the sound; something to think about. I currently use an xDSD to drive my TH-909. The frequency curve that I use has changed over time. After 100+ hours of listening, I now apply a more conservative frequency curve. I initially thought the TH-909 was a fun headphone but I'm now starting to appreciate it as my all purpose go-to cans.
June 4, 2019
11 months ago
My headphone experience just got better...way better.
Drew was nice enough to spend an afternoon (off and on between other responsibilities) to help me select a new headphone and DAC. After testing about 15 in my price range, I went with the Fostex TH-909. While no expert in evaluating headphones, I know my HD music sounds better with good cans. While these at not the best or worst headphones sold by Moon Audio, they get the job done. I love the sound. I also got Silver Dragon cables. I love these too.
Fostex TH-909 Headphone Stand/DAC garage
Fostex TH-909 Headphone Stand/DAC garage
January 3, 2019
10 months ago
Response from Moon Audio
Thanks so much, George. We love to help music lovers like yourself find their perfect headphones. We are thrilled you love your silver dragons as well, the silver dragon is a great sonic match for the Fostex TH-909 headphones for a variety of music preferences.
January 11, 2019
Nichole B
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Fostex TH909 Headphones - Unboxing

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