![Amazon.com: Audioengine 32-bit D1 Portable Desktop Headphone Amp and DAC, Preamp, USB/Optical Inputs, Hi-Res Audio Playback (2nd Gen) : Electronics Amazon.com: Audioengine 32-bit D1 Portable Desktop Headphone Amp and DAC, Preamp, USB/Optical Inputs, Hi-Res Audio Playback (2nd Gen) : Electronics](https://m.media-amazon.com/images/I/61nsXehpxOL.jpg)
Amazon.com: Audioengine 32-bit D1 Portable Desktop Headphone Amp and DAC, Preamp, USB/Optical Inputs, Hi-Res Audio Playback (2nd Gen) : Electronics
![Monolith by Monoprice Portable Headphone Amp and DAC with THX AAA Technology review: High value, minor flaws | TechHive Monolith by Monoprice Portable Headphone Amp and DAC with THX AAA Technology review: High value, minor flaws | TechHive](https://www.techhive.com/wp-content/uploads/2023/04/monolith-portable-headphone-amp-hero-100796374-orig.jpg?quality=50&strip=all&w=1024)
Monolith by Monoprice Portable Headphone Amp and DAC with THX AAA Technology review: High value, minor flaws | TechHive
![Amazon.com: FiiO Headphone Amps Portable DAC USB Type-C coaxial 384kHz/32bit (E10K-TC black) : Electronics Amazon.com: FiiO Headphone Amps Portable DAC USB Type-C coaxial 384kHz/32bit (E10K-TC black) : Electronics](https://m.media-amazon.com/images/I/51EmjN4nkoL.jpg)