AudioQuest DragonFly Black v1.5 Plug-in USB DAC + Preamp + Headphone Amp

AudioQuest DragonFly USB DAC V1.5 For Parts Only

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AudioQuest DragonFly DAC headphone USB Digital Audio Converter (Black) Preamp

LH Labs Geek Out 720 USB DAC Headphone Amp

M-Audio Micro DAC 24/192 Portable 24 bit/192 kHz USB Digital-to-Analog Converter

Micca OriGen+ High Resolution USB DAC and Preamplifier - 24-Bit/192kHz PCM

Audioengine D3 Premium 24-Bit DAC and Headphone Amp