I have a Picade arcade machine running a Raspberry Pi 3 Model B using RetroPie.
If I plug headphones in to the Pi directly, I get good sound.
If I plug headphones in to the Picade PCB board headphone jack (with the 3.5mm cable connected from PCB to Pi), I get poor sound in the left ear only.
If I remove the headphones, I get no sound from the speakers at all.
I have made sure the settings in RetroPie are outputting to 3.5mm.
Any suggestions? Is there an alternative PCB board I could wire the 2 speakers to (a red and black cable each) and connect directly to the Pi perhaps?