H-DAC – High performance 192 kHz / 24-bit DAC with addon options - nihtila.com
The great audio myth: why you don't need that 32-bit DAC
Amazon.com: Fosi Audio Q4 Headphone Amplifier Mini Stereo DAC 24-Bit 192 KHz USB Optical Coaxial to RCA AUX Digital-to-Analog Audio Converter Adapter for Home Desktop Powered Active Speakers : Electronics