USB Xonar U5 USB Sound Card, 5.1-channel HD (192kHz/24-bit) surround sound, Signal-To-Noise Ratio 104 dB, Volume control

USB Xonar U7 MK2 USB Sound Card, 7.1 channel surround, DAC Resolution 24-bit,Signal-To-Noise Ratio 114 dB, Volume control, output select, DirectSound3D GX 1.0, Dolby Home Theater ...