Proprietary USB interface with ARM + FPGA solutions. AK4191+AK4499EX hardware decode up to PCM 1536KHz and DSD1024. High resolution display that includes a Spectral Analyzer.. High current line outputs, fully balanced headphone amplifiers that is perfect for headphones with different impedances and sensitivities, 99 steps digitally controlled analog level control.. COAX/Optical/AES support up to DoP64, DoP128, PCM 384KHz.. USB supports DoP64, DoP 128, Native DSD64-DSD1024, PCM 16-32bit/44. 1-1536KHz.. Dual clock mode brings many different sound styles with the combination of filter settings.