Brand new Polk audio speakers.....the joke of an installer after having me there for 4 hours installing a stereo....telling me that the unit he tried to put in was defective....Now the new stereo sounds like crap....It had an aftermarket unit in before that sounded fine....Why does this one sound like crap? Do I need to go in and light Circuit city up? Is there an amplifier that might have gone bad that I do not know about?