TH Premium Series
TH900mk2(Onyx Black)
Premium Headphones
A limited edition model with a lacquer coating that reveals the grain of beautiful mizume cherry wood by Sakamoto Otozou Shoten, a company that has been in business for 110 years.
Features
Limited edition model with special colors and audio tuning different from the original.
BioDyna diaphragm made of ultra-fine bio-cellulose fiber material is used.
Utilizing know-how accumulated over many years, bio-cellulose fibers are blended with other fibers and other materials under optimal conditions. Low specific gravity, high Young’s modulus and high internal loss are realized. In addition to reproducing delicate, high-resolution and beautiful mid-high frequencies, the free edge with good linearity faithfully reproduces low mid-range frequencies with large amplitude.
BIODYNA” and “BIODYNA” are registered trademarks of Foster Electric Co.
What is Biocellulose Fiber?
Bio-cellulose fiber is made by advanced biotechnology and is an ultrafine fiber with a thickness of 20 to 50 nm (nanometer), about 1/1000 of natural plant fibers (such as cotton). These fibers are extremely pure α-cellulose, with almost no harmful impurity components, and exhibit the highest level of crystallinity. The ultrafine bio-cellulose fiber has excellent reproduction ability in the mid and high frequencies. When various fibers are combined with this fiber in an appropriate blend, a sound quality that combines the characteristics of each fiber can be obtained, enabling sound creation of a higher level. We have established a technology for mass-producing high-performance diaphragms by blending bio-cellulose fibers with other fibers under optimal conditions, utilizing the know-how we have accumulated over many years.
● Magnetic circuit with repulsive magnetic field is equipped with an ultra-strong driver unit with a magnetic flux density of 1.5 Tesla.
A low distortion, ultra-strong, high-performance magnetic circuit with a magnetic flux density of 1.5 tesla using neodymium magnets provides a vast dynamic range.
Lacquer-finished housing that satisfies the pleasure of ownership along with high quality sound
The surface of the wood part is finished with a lacquer craft originally developed by SAKAMOTO Otsuzo Shoten, a company founded in 1900 (Meiji 33rd year) that applies traditional Japanese crafts to today’s industrial products. The lacquer used is black lacquer. The prestigious black color is harmonized with the beautiful grain of Mizume cherry, a high-grade wood.
Wood quality: Mizume cherry
Mizume-zakura is a variety of birch (Betula maximowicziana), a species native to Japan. The Mizume-zakura is a high-grade wood suitable for furniture manufacturing because of its fine grain and hardness, and its beautifully finished surface.
7N grade high-purity OFC unbalanced cable (ET-H3.0N7UB) included
The unbalanced cable comes with 7N (99.999999%) grade high-purity OFC (Oxygen Free Copper) unbalanced cable, which is essential for achieving high resolution and expressing this sense of luster, and has high transmission capacity by eliminating impurities to the utmost limit. The plug sleeve is made of highly durable duralumin.
The unit is equipped with a detachable connector port and uses 7N grade cables for internal wiring.
Features a detachable connector terminal with rhodium-plated treatment that is hard, abrasion-resistant, and corrosion-resistant, and a detachable contact terminal on the headphone body side. Balanced connection is also supported with the separately sold balanced connection cable (ET-TH4.4BL/LET-H3.0N7BL).
Lightweight earpads
Protein leather and low-resilience cushions are used for ear pads.
Egg-derived protein is blended into the earpads for a pleasant feel and comfortable fit.
In addition, they are 60% lighter than genuine leather.
Specifications
Main Specifications
| Type | Closed dynamic |
|---|---|
| Driver | φ50 mm neodymium magnet / BioDyna diaphragm |
| Frequency response | 5 to 45,000 Hz |
| Impedance | 25 Ω |
| Sensitivity | 100 dB/mW |
| Max input | 1,800 mW |
| Weight | Approx. 390 g (excluding cord) |
| Cable | 3 m Y-type 7N-OFC wire (detachable) |
| Detachable terminal | 2-pin (Terminal: gold-plated base, rhodium-plated specification) |
| Plug | 6.3 mm diameter gold-plated stereo standard plug |
| Accessory | Leather style pouch |
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