FiiO K3 DSD USB-C DAC and Headphone Amplifier for Home and Computer(3.5mm Single Ended/2.5mm Balanced/Coaxial and Optical Digital Outs) Headphones & Accessories - Newegg.com
FiiO FD3 In-Ear Monitors + New K3 Desktop DAC/Amp Review - New K3 Desktop DAC/Amp | TechPowerUp
Amazon.com: FiiO JadeAudio KA2 4.4mm Balanced Headphone Amps USB DAC DSD256 32bit/384kHz PCM for Android/iOS/Windows/Mac (USB Type C) : Electronics
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