I've done a lot of searching the internet for a solution to this and nothing seems to fit the bill, so hopefully someone here can point me in the right direction. I noticed no sound coming from my FL tweeter, so I played with the balance and fader. What I realized is, moving the fader all the way to the left gets me no sound at all in the front or the back. I can hear faint white noise from the FL tweeter. I thought perhaps it was the front amp, but the right side seems to work fine. Any suggestions?