With the design phi53-mm driver only for AD1000X of OFC7N voice coil adoption, it is rich, moistens, is, and is OFC7N voice coil of 99.99999% of reproduction sound purity. It adopts and also unifies the magnetic-circuit metal parts (yoke) which consist of two parts. Efficiency is improved by raising the degree of magnetic bunch, and rich reproduction sound is realized. The establishment meter diffuser which diffuses the air inside a housing is carried, and a spread of sound is pursued. right-and-left both appearance was carried out, the transmission loss of input code right and left of right-and-left independent earth wire (four cores) structure was lost, and high-quality sound was made possible with 4 core structures where a well-balanced sound which thought sound quality as important was pursued. An adoption light weight and magnesium with high rigidity were adopted for the lightweight design frame of the rigid outstanding Magnesium alloy, and weight of 265 g was realized. A light feeling of wearing is pursued by 3D wing support. Form is changed into "line" contact from the "field" contact adopted in AD series until now [ total year fit design ] suppressed the feeling of oppression. a long time is also comfortable -- you stick and can enjoy yourself in a feeling. It is durable and the touch also changes a year pad into "field" contact from old "line" contact conversely with the high-quality feeling wing support of a fit with the low rebounding year pad of a good suede material. A low-pass omission is prevented and the low-pitched sound of force is reproduced.