I just bought a pair of Cerwin Vega 5x7 speakers ss2683. The sound is nice a lower volumes, perhaps a bit bright. When I turn them up the bass distorts very quickly and the high start to crackle. I have a new clarion head unit 20rms 50 peak (bypass the fact amp). They dont seem to handle volumes much higher than the stock speakers. How do your speakers compare? Is it my speakers or my HU or the car?