Sony PHA3 PHA-3 Headphone Amp, Black Flexible, Powerful, and pocket-able Convenient Analog and Digital connectivity meets powerful digital audio conversion/amplification circuitry Supporting up to 384 kHz/32-bit PCM and DSD (2.8/5.6) sources, for immersive and pocket-able Hi-Fi. Compatible with USB Audio, PCM 384 kHz/32-bit, DSD