Amazon.com: USB Audio Converter, Digital to Analog DAC Audio Converter with Coaxial/Optical Digital Output USB Audio Sound Card for Laptop or Desktop Systems, Plug and Play : Electronics
Amazon.com: Syba USB 24 Bit 96 KHz DAC Digital to Analog Headphone Amplifier 2 Stage EQ Digital/Coaxial Output and RCA Output (SD-DAC63118) : Industrial & Scientific