well im planning on putting 2 6x9 pioneers on the back, something in the dash and a 15" subwoofer in the trunk. the sub came out of an old guitar amp. not sure of the the size or anything because it had no labels or anything. right now just that sub is set up in our shop with a 25 watt amp on the cheapo 6 disk walmart cd/radio. but when i turn it up more than about half way the bass gets reall distorted. when i put it in my car its going to need a bigger amp right? and will that bigger amp fix my sound quality problem or is it just the old crappy speaker?