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 (United States)
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Creative Sound Blaster X-Fi Surround 5.1 Pro USB Sound Card 54651173699 | eBay
You Need a USB Sound Card: Creative Sound Blaster Omni Surround 5.1 USB Reviewed - VR World