FX Audio D802 2x80W 192KHz Digital Remote Power Amplifier Silver USB/Coaxial/Optical Input:bidth width 16--24 bit Sampling Rate 44.1KHz-192KHz 2x80W Super High power remote digital amplifier USB can support upto 192KHz. NOTE: Product does not support audio output from FIOS STB 32V 5A high-power power supply For power related issues : The power adapter lights up when power on and check the cables.