The inn Year type of the high quality sound design in which 8.5mm driver of exclusive development exceeded the size sense A high magnetic force neodymium magnet is used for the 8.5mm driver unit. Yamaha highly precise in a diaphragm、 a diaphragm is most suitable by the volume which adopts a personal tangential edge as well as is the time of practical use、 kadou、 though it's compact size、 the wide band revival is made possible to set it as the edge shape and the vibration part (dome) area. A housing designs so that a sound conduit may equal a driver in alignment so that the tone of the driver may reach an eardrum straight. The unnecessary resonance which causes impurity of sound by adopting a polycarbonate and compound resin of ABS as ABS resin and the rear part in a front part and making it the material different in the hardness is reduced to the material. Such as loading the sound tuning pipe which suppresses an unnecessary high pass peak、 the high-quality sound quality is being pursued. "EPH-22" a series reproduces a powerful low voice and is pursuing the sound which can enjoy music comfortably.

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