the reason why the rockford door speakers sound like shit is because of the oem hu.put a nice aftermarket hu on them and they will sound 100% better.mine are running off of my alpine 9887 with a 3 band cross over,a 5 band parametric eq,or if i choose,the 7 band eq.the factory hu is hard on door speakers because you cant fine tune it.
this is the reason why people are blowing the door speakers.and unless you're going to amp the door speakers,then a top of the line hu will do.ive had just my door speakers bumpin before and i was vibratin shit in my garage lol.with my aa havoc 12,i dont need the door speakers for bass even though they do put out.and i have the plastic cone door speakers ftw.
edit:and im talking about the front door speakers.the rear ones suck no matter what.when you are running a sub in the rear,the rear doors speakers will cancel out some bass as long as you're not listening to a heavy bass track.the only time i fade in my rears is when the bass starts to overcome the fronts