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iFi Nano iDSD Black Label Portable USB DAC and Headphone Amplifier - Upgrade Smartphones/Digital Audio Players/
Hiby FC5 MQA Portable USB DAC, 4.4mm Balanced Headphone Port AMP
Amazon.com: HiBy FD3 High Resolution Headphone Amp USB DAC Type-C Nearly Zero Noise Floor 3.5mm SE+2.5mm+4.4mm Balanced Headphone outputs : Electronics
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Amazon.com: SoundMAGIC A30 Portable Headphone Amplifier HiFi Stereo Earphone Amp High Resolution DAC Adaptive impedence to 600ohm Type C Connector for Andriod Device and PC : Electronics