06-26-2019, 09:35 PM
Suggest trying the headphone audio jack directly on the pi4. Surprisingly good audio, I think I read 36 ohm headphones OK. Running Hifiman HE-400i FLACs VLC, Rpi4 1 G, quite surprised at the quality for a $35 board (plus $10 power supply, $7 microSD and $10 for microHDMI, note micro).