Sound Blaster X7 - Desktop USB DAC and Audio Amplifier - Creative Labs (United States)
Amazon.com: 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 : Electronics
Callia(Prism Sound)|ミックスウェーブ[Mixwave] USB DAC & プリアンプ