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NEW Asus XONAR U7 MKII 7.1 USB HD Sound card headphone amplifier volume control 889349481394 | eBay
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Audio Interface External USB Sound Card Recording Guitar Headphone Mic Amplifier 310094274783 | eBay
Sound Blaster Internal and External USB DAC and Amp Sound Cards and Buying Guide - Creative Labs (Pan Euro)
Asus Xonar U5 5.1-Channel USB Sound Card & Headphone Amplifier, 192kHz
Sound BlasterX G5 - 7.1 HD Audio Portable Sound Card with Headphone Amplifier - Creative Labs (UK)