Sound Blaster X3 Hi-Res External USB DAC and Amp Sound Card with Super X-Fi Holographic Audio, 7.1 Discrete Surround and Dolby Digital Live with Line-in and Optical-out for PC and Mac :
Sound Blaster X4 - Hi-res 7.1 External USB DAC and Amp Sound Card with Super X-Fi® and SmartComms Kit for PC and Mac - Creative Labs (UK)
Sound Blaster X3 - Hi-Res 7.1 Discrete External USB DAC and Amp Sound Card with Super X-Fi for PC and Mac - Creative Labs (UK)
Sound Blaster X3 Setup Video - YouTube
Creative Sound Blaster X3 Digital Audio Converter 32bit/192kHz Tested Working | eBay
Creative Sound Blaster X3 External USB DAC Review - Page 3 Of 6 - Modders Inc