My front speakers are Rockford 3" and I want to eliminate all bass response to them. I would like midrange and highs only to go to the speakers. Can someone tell me what size Cap to use to accomplish this rolloff. Also in the back panels I have 6 1/2 inch three ways, Are there any suggestions for crossovers for them? The back speakers are on thier own Rockford P3002 amp. the front speakers are connected to the radio not an amp. I have 2 12 subs and they are producing enough Bass. I don't need the other speakers producing bass. I am looking for good midrange and popping vocals sound. Any info appreciated.