Using the “Creative Sound Blaster X-Fi Surround 5.1 Pro ... - rf system
Creative Sound Blaster X4 Hi-Res 24bit/192kHz External USB DAC and Amp Sound Card, Super X-Fi, Multi-Channel, 7.1 Discrete Surround, Optical-in, Optical-out, Line-in, Mic-in, Headset-in for PC and Mac - Newegg.com
Creative Sound Blaster X-Fi HD Review - Closer look