Portable Headphone Amp | USB DAC Headphone Amplifier | PHA-3 | Sony Taiwan
Lehmannaudio Linear USB II USB/DAC Headphone Amp | Hi-Fi News
Amazon.com: AudioQuest DragonFly Black v1.5 Plug-in USB DAC + Preamp + Headphone Amp : Industrial & Scientific
Amazon.com: HELM Audio Bolt DAC/AMP, USB-C Portable High-End DAC/Headphone Amplifier with MQA Playback. Mobile Studio Sound for Android, iOS and PC. USB-C to 3.5mm Audio, THX Certified : Electronics
Apogee Electronics Groove - 24-Bit 192 kHz USB DAC and GROOVE