--Support AES/EBUIEC60958S/PDIF truly supports hardware 71 channels. Can be connected to 71 speakers --Up to 48KHz sampling rate, support 32KHz/44KHz/48KHz digital recording function --Support compatible for Win98/ME/2000/XP/VISTA/MACOS91 (only 2 channels can be used in MAC) full-duplex audio stream..