The PM-1 headphones use an FEM optimised magnet system with very high energy Neodymium magnets. The headphones magnetic system and conductor patterns are said to be optimized for maximum sensitivity and consistency over the whole of the radiating area.
The Oppo PM-1 headphones are said to give a very open, transparent and very dynamic sound with balanced tone and very low distortion.
The HA-1 headphone amplifier from Oppo offers a Class A balances power amplifier section with the ESS 9018 Sabre 32 Reference DAC. In effect the headphone amp doubles as an asynchronous USB DAC, a stereo pre-amp, a digital audio dock for smart phones etc and a Bluetooth audio transport.
The control knob is motor driven so users can use the remote or turn by hand and they will have a choice of balanced XLR or quarter inch headphone jack. Line level inputs are given both RCA and XLR sockets.