the guy i bought the car from was an idiot and cut speaker wires left and right to "improve the sound quality" well now i have the car and it sounds like crap, i replaced the speakers and got some Focal 5 in. rears, and 2 Focal tweeters for the front, then smaller front focal speakers. now i got them in they sound like crap, and their a good speaker so im thinking the the wiring he has in the car is messing up the frequencies, how should i go about rewiring the speakers?