i got polk db 6500 series comps in my geo n they sound out of phase as hell, even with pos to pos n neg to neg, i unno wtf it is, but mine aint harsh n it has to do with amp, i might soon take em out of my geo n put em in my truck, n what knot
i got mine ran from shitty ass 600w 4ch sony amp n they sound ok
i took some roofing stuff kinda like dynamat n did my doors with it n it made a good amount of diff in sq n helped fill that void, my kickers had that peak sound like urs do n sound like some hella over powered 3&1/2's till i put that deadning in n turned the eq down on my amp n now it sounds like i got 6x9's in my doors n 8's in the back lol
but im leanin more twards a hertz setup with a good set of 12's n what knot, ive had a set of 12's get louder than my 15's with same amp n thats a damn shame to tell the truth, so i need to rework my stereo n see how loud i can get