I have sony  CDX-GT565UP head unit, Sound Ordnance™ P-52CB - Front, tweeters and speakers, Pioneer Gmail h120 brI'd get 4 channel power amplifier, 2 jl audio 10 inch 150 watts subwoofer in an in closed box, lightning audio capacitor And I'm having a lot of trouble tuning everything. There is distortion through all the speakers. I'm not sure why. I've tried many guides and methods still. Any help would be greatly appreciated. In a 2004 bmw 330xi