iFi Audio ZEN DAC V2 Desktop USB DAC / Headphone Amp
iFi Announces New Hip-DAC Portable USB DAC/Headphone Amp | audioXpress
Amazon.com: FiiO K3 DSD256 | 384K/32Bit USB-C DAC and Headphone Amplifier for Home and Computer(3.5mm Single Ended/2.5mm Balanced/Coaxial and Optical Digital Outs) (K3 Titanium) : Electronics