Just a last minor problem, I still sometimes get a loss of signal on the left speaker. But this time just doing light tapping on the fine knob at 0 db will already do the trick (no need for wiggling the knob). It sometimes occurs after playing music for awhile like 5-10 minutes. Hope that goes away through time.
From our last exchange of text, I really did not find something shorting it. What I did last time was just loosened and re-tightened (but not too tight) the screws holding the assembly of attenuators to the chassis. Somehow things improved with that maneuver.
But still randomly I run into that problem. Once I get back the sound the left channel, sounds really balanced and no distortion.
Overall the Beepre 2 sounding really fantastic!