Sometimes the audio levels drop, it's like im only getting one channel and bass is reduced, volume drops and so does bass - it's like a 50% drop. I've only got one sub installed currently, which I guess could have something to do with it..?

What could be the cause of this? If you loose ground you get almost no volume, so I dunno.. Using and iphone 3gs line-out as source, pretty loud actually.

 

Is your speed sensitive AVC (automatic volume control off) ? Hold down volume knob for 2-3 seconds. If it says AVC ON, then quickly press volume control one time, it should change to AVC OFF.

Not sure its your problem, but worth a try.

 

AVC OFF, it said, so I guess it was OFF.

It seems like the problem is that the right channel drops out at times, but the signal cables are soldered pretty solidly, so it shouldn't be a cable issue.

 

I will try with a different and stronger source..