Optimal Shop USB 2.0 External Sound Card 6 Channel 5.1 Surround Adapter Audio S/PDIF for PC (Blue) USB 6 Channel 5.1 External Sound Audio Card for PC Laptop OS support: win98 / XP / 2000 / Vista / Win7/8.External sound card USB 6 channel 5.1 audio. Record & play back digital and analog audio without sound card in your computer. USB sound is and USB audio controller. It supports 32KBz, 44.1khz. (which two need driver or application software support) and 48Khz sampling rate in digital recording, 48KHz sampling in digital\analog audio playback.In digital playback mode, itreceives audio stream form PC via USB interface and transmits audio data according to the AES\EBU, IEC60958, S\PDIF cnsumer interface standards. Only R L channel PCM audio in 5.1 channel can be conveyed in digital playback mode. In analog playback mode, it supports 6 channels codec for analog playback In digital recording mode, it receives S\PDIF digital audio input and sends back to PC through USB. Three sampling rates, includes 32KHz,44.1KHz are automatically locked internally. In analog recording mode, fixed 48KHz sampling rate issupportedby analog audio recording. If you want the fiber output to support 5.1-channel output, you must have the following conditions:1.The sound source must be DTS 5.1 channels, such as 3D games, HD movies. If it is a general MP3 or general 2-channel video, you can only have 2-channel effect. 2.The player settings are important: if it is set up with PowerDVD software from the fiber output "Passthrough" through. Meaning that the sound card is only responsible for the fiber signal output, not decoding. Dispensers strongly recommend KMP this player, the function is very powerful3. After the fiber output must be AC3 / DTS decoder, or built-in AC3 / DTS decoder amplifier and the like