Focusrite Saffire 6 USB Not class-compliant HeadAmp Pico USB iBasso DC03 Full of bugs, volume spikes, no volume, glitches. Korg DS-DAC-100 Not class-compliant Lexicon IO42 LH Labs Geekout 450 Line6 Helix Toneport UX1 Toneport UX2 Lotoo PAW S1 Too many issues with this DAC M2TE...