USB 6-channel 5.1 external sound card, suitable for PC laptop operating system support: win98/XP/2000/Vista/Win7/8. External sound card USB 6-channel 5.1 audio. You can record and play digital and analog audio in your computer without a sound card.$ USB sound is compatible with USB audio controllers. It supports 32KBz, 44.1khz. (All need driver or application software support) and 48Khz sampling rate digital recording, 48KHz sampling digital analog audio playback. , SPDIF consumer interface standard. In digital playback mode, only 5.1 channel RL channel PCM audio can be transmitted.$ In the analog playback mode, 6-channel codec is supported for analog playback. In digital recording mode, it receives SPDIF digital audio input and transmits it back to the PC via USB. Three sampling rates, including 32KHz and 44.1KHz, are automatically locked internally. In analog recording mode, analog recording supports a fixed 48KHz sampling rate.$ If you want the optical output to support 5.1 channel output, the following conditions must be met: 1. The sound source must be DTS 5.1 channel, such as 3D games, high-definition movies, etc. If it is a general MP3 or general 2-channel video, there can only be 2-channel effects.$ 2. The player setting is very important: if it is set with PowerDVD software, the optical fiber "Passthrough" output is passed. This means that the sound card is only responsible for optical fiber signal output, not for decoding. The shopkeeper strongly recommends the KMP player, which is very powerful. 3. After fiber output, it must be an AC3/DTS decoder, or a built-in AC3/DTS decoder amplifier, etc.