Benchmark DAC3-L Reference DAC and Stereo Preamp 500-14800-331
Nobsound Hifi Bluetooth 5.0 Receiver Dac Stereo Audio Preamp Usb Music Player Fm Radio Headphone Amp Supports U-disk Sd - Headphone Amplifier - AliExpress
Cocktail Audio HA500H Hybrid Headphone Amp/Preamp/Asynchronous USB DAC (Black)
Burson Audio Conductor 3 GT Grand Tourer Single-Ended USB DAC/Headphone Amp/ Preamp
Micca OriGen+ USB audio DAC and Preamp | Micca Electronics
Douk Audio P1 Tube Headphone Amp Offers Smooth Analog Sounds from USB or Bluetooth Sources