The icusbaudio2d external usb sound card lets you add an spdif digital audio output and standard 35mm analog audiomicrophone connections to your system through usb a convenient way to bypass or replace an internal sound card without having to open the computer case for home theater quality sound the usb dac digital to analog converter offers 96khz 24 bit sampling rates for both playback and recording and a 35mm spdif port with support for dolby digital 51 surround sound ac3 and dts pass t