Fostex USA 25-Ohms TH900 Premium Stereo Headphones with Japanese Lacquer Earcups and 1.5 Tesla Magnetic Circuit

TH-900 Premium Stereo Headphones. The TH-900 is the first high-end headphones form Fostex featuring the newly designed driver unit with1.5 tesla (15,000 gauss) magnetic circuit and bio-dynamic 50mm diaphragm, traditional Japanese lacquered "Urushi" finished craftsmanship housing and selected 7N OFC cable. All coming together to achieve the sonic goal of a wider stereo field, high resolution and transparent reproduction. "Biodyna diaphragm is made by Bio-cellulose fiber featuring low specific gravity, high Yang's modulus and high internal loss at the same time to achieve 2 times high propagation velocity and 5 times high rigidity against the conventional plastic film based driver unit.