High end DAC (power \ signal) separate amplifier usb cable USB-A to USB-B DC plug 5.5*2.1mm to USB-B Independent power supply _ - AliExpress Mobile
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Amazon.com: Douk Audio ST-01 PRO 200W Bluetooth Amplifier, 2 Channel Vacuum Tube Power Amp with USB DAC/Coaxial Optical Inputs/VU Meter/Treble Bass Control for Home Theater/Stereo Speakers (Upgrade Version) : Electronics