are you talking about the stock amp or an aftermarket amp? when i first power up the truck my amp (afrtermarket) hesitates to turn on and gives me a little "pop" i guess you can say through the subs.
can't help on the camera, sorry, i bought one for my brother but haven't installed it yet. i am looking into one as well
If you have a after market radio, the output voltage is to high for the stock amp. Some radios recommend you put a resistor in the line. It worked for me. Cheap at Radio Shack.