I currently have 2 15" mtx 8000 with a 1501d amp. My inside speakers are some crappy sony xplods. I just want my inside speakers to produce vocal/treble and my subs to give it all the bass. I just want my inside speakers to produce vocal because when they hit the bass, they make the whole system sound terrible. I'm thinking an equalizer would fix it but i would like someone elses opinion. If so, what kind? and if not what would help me out? Thanks