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Sony PHA-2A High-Resolution Portable Headphone Amplifier USB DAC F/S JAPAN USED | eBay
Amazon.com: Audiolab Portable Headphone Amplifier Audio Powered USB DAC Headphone Amp for Phone (Android,USB-C Port) : Electronics
Amazon.com: Apogee GROOVE - Portable USB Headphone Amp and DAC, Bus Powered for Mac and PC, Made in USA : Apogee: Electronics
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iFi iDSD Diablo-X Transportable DAC and Amp | Bloom Audio
iFi Audio ZEN Air DAC Hi-res Desktop USB DAC and Headphone Amp | World Wide Stereo