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The Fostex TH-900 MK2 represents the pinnacle of Japanese expertise in high-end audiophile headphones. This closed-back circumaural model combines cutting-edge acoustic technologies with traditional Japanese craftsmanship. Equipped with 50 mm dynamic drivers featuring an impressive magnetic flux density of 1.5 Tesla and a proprietary “Biodyna” diaphragm, these headphones deliver sound reproduction with exceptional precision and richness. Its Japanese cherry birch housing with a Bordeaux “Urushi” lacquer finish is not only visually striking but also contributes to the overall acoustic qualities.
The TH-900 MK2 immediately stands out with its Japanese cherry birch (Betula Grossa) ear cups, adorned with a traditional Bordeaux “Urushi” lacquer finish. This lacquering technique, practiced for centuries in Japan, requires considerable artisanal expertise and involves multiple hand-applied layers. Beyond their visual beauty, these wooden ear cups are not chosen at random: Japanese cherry birch offers optimal structural rigidity while providing a natural tonal coloration that enhances the headphones’ sound signature.
Each pair of TH-900 MK2 headphones is unique, with subtle variations in the wood grain and lacquer finish. This artisanal approach contrasts with the standardized industrial production of most contemporary headphones. The ear pads are made from high-quality protein leather, offering both durability and comfort during extended listening sessions.
The headband is designed to evenly distribute pressure across the skull, compensating for the headphones’ 390-gram weight. This attention to detail is also evident in the quality of the materials used for the metal components, with refined finishes that reflect Fostex’s premium approach to this flagship model.
At the heart of the TH-900 MK2 is a neodymium magnet system generating a magnetic flux density of 1.5 Tesla (15,000 Gauss), an exceptionally high value in the world of audio headphones. This magnetic power allows precise control of the 50 mm dynamic drivers, resulting in impressive responsiveness and dynamics.
Fostex’s proprietary “Biodyna” diaphragm is another major technical innovation. This diaphragm combines lightness and rigidity to faithfully reproduce the subtlest sound nuances, from deep bass to crystalline highs. The extended frequency response of 5 Hz to 45 kHz far exceeds the human audible spectrum, ensuring uncompromised reproduction of high-resolution recordings.
The closed-back design of the ear cups ensures effective acoustic isolation, limiting sound leakage and external interference. This design also allows for deeper and more controlled bass compared to an open-back model. With an impedance of 25 ohms and a sensitivity of 100 dB, the TH-900 MK2 is relatively easy to drive, although a quality amplifier is recommended to fully exploit its potential.
Despite its 390-gram weight, the TH-900 MK2 has been designed to offer optimal comfort during extended listening sessions. The circumaural ear pads completely envelop the ears, creating an ideal acoustic chamber while evenly distributing pressure. The protein leather used for these ear pads combines softness to the touch with durability, while allowing slight breathability to limit heat buildup.
The adjustable headband adapts to different head shapes and maintains balanced pressure. Its robust design ensures the headphones’ longevity while preserving comfort. The joints between the headband and ear cups allow sufficient rotation to perfectly fit the natural angle of the ears.
The closed-back design, while it may generate slight heat buildup during very prolonged use, offers appreciable acoustic isolation in return. This feature makes the TH-900 MK2 a relevant choice for listening in shared or slightly noisy environments, where an open-back model would let in more external sounds.
One of the major improvements of the TH-900 MK2 compared to its predecessor is the adoption of a detachable cable system. This technical evolution offers several practical advantages: the ability to replace the cable in case of wear, the option to use different types of cables as needed, and compatibility with balanced connections for the most demanding users.
The included standard cable (model ET-H3.0N7UB) is made of 7N-grade OFC (Oxygen-Free Copper), ensuring optimal signal transmission. Measuring 3 meters in length, it ends with a gold-plated 6.35 mm stereo jack for reliable and durable connection. The connectors on the headphone side are rhodium-plated to resist oxidation and maintain impeccable contact quality over time.
For audiophiles wishing to explore the possibilities of balanced connections, Fostex offers the optional ET-H3.0N7BL cable, compatible with this model. This flexibility allows the headphones to adapt to different listening configurations, from traditional amplifiers to more specialized systems using balanced connections.
What is the main difference between the TH-900 MK2 and the original model?
The main evolution of the MK2 compared to the original model is the adoption of a detachable cable system. This improvement allows for cable replacement in case of wear, the use of different types of cables as needed, and compatibility with balanced connections via optional cables like the ET-H3.0N7BL.
Does this headphone absolutely require a dedicated amplifier?
With an impedance of 25 ohms and a sensitivity of 100 dB, the TH-900 MK2 can technically operate with most modern audio sources. However, to fully exploit its sound capabilities, a quality amplifier is highly recommended. Fostex also offers amplifiers specifically designed to get the best out of their high-end headphones.
How does it compare to the TH-909 model from the same brand?
The TH-909 is the open-back version of the TH-900 MK2. It shares the same driver technology and lacquered wood finish, but its open design offers a wider and more airy soundstage at the expense of reduced acoustic isolation. The TH-900 MK2, with its closed-back design, provides deeper bass and better isolation, making it more versatile in different listening environments.
Laurent
Neutral headphones of excellent quality but lacking a bit of emotion.
Comment from May 07, 2020 — Experience from September 08, 2017
