I replaced the original stereo unit with a Sony head unit and replaced all speakers with Infinity's...6 1/2" up front and 6x9's in cargo area...anyway, my problem is whenever I'm playing CD's and I start to crank it up at a certain level, it starts to cut out a few seconds and then it plays again, like it's "clipping"...just thinking, maybe I need an Amp to supply the power that the speakers need....