I just recieved my QSC USA 850 from QSC. I hooked my Carvin PB-200 into it from the effects loop through channel 2 of the QSC. The sound no louder than with the Carvin! I maxed it out, and still no louder. (maybe preamp gain, because it wasn't clipping) Anyways, I bridged it, and it was distorted and teh clip light went on, and it was real quiet... At that point I realized I didn't put on the bridge switch! I immediatly turned off the amp. When I plugged it back into channel 2, it didn't work at all. The same thing with channel 1. Won't work bridged anymore either Could I have fried the amp by not putting the bridge switch on in bridge mode for 10 seconds? There are two weird things. When I turn it on, after a few seconds, there it buzzes for about half a second, then stops. Also, after I turn the amp off, if i take out and put back the bannana plugs, the speaker makes clicking (connecting) sounds. After about half a minute, it won't do that. Also, can anyone tell me why the binding posts screw in and out?