Audiophilepure

http://goo.gl/sNur6W

The PM-1 headphones are a worthy match for the HA-1. It is an over-ear planar magnetic approach to headphone design that introduces some new developments with planar phones. According to Oppo, the PM-1 employs “a unique 7-layer diaphragm, double-sided spiraling coils, and an FEM-optimized magnet system.” It is driven by a two-sided, seven-layer planar diaphragm, which allows for a powerful push-pull drive that is very even”