I just installed a 600watt 4 channel MTX MXA amplifier. I am running infinity perfect 6.1 in the front, and I plan on getting some 6x9's for the rear. I am also running one 10" woofer. Now, my plan was to use the 4 channel amp to run the perfects and the 6x9's, and another bridged 2 channel amp to run the woofer. I have two problems so far: 1.) When I hook my RCA cable to my front speaker output at my head unit, I get a strange buzzing noise in my speakers. When I hook my RCA cable to my rear speaker output at my head unit, there is no noise. What could this be caused by? Is it possible that the RCA output for my front speakers is bad? 2.) When I turn my volume up pretty high, my sound is played in jolts....like the power to the speakers is turning on and off every 1/2 a second. Does this mean my amplifier is not getting enough power? Bad wire? What could it be?