since i originally did my system in my bronco, things have broken, parts have become mismatched, etc....and i want to re-do everything except my subs. the goal is a nice mid-range SQ setup; 75 - 100W RMS to each speaker; pioneer head unit to drive it all (i like pioneer, i use the AUX input for my mp3 player, etc) so here are my questions: up front i have 2 6.5'', and rear i have 2 6x8's. this may sound dumb, but if i get a 4-channel amp, will a newer head unit process the sound individually to the 4 channels, almost like a surround-sound setup? or is it just power-splitting? i'm having trouble finding a set of 6x8's that will match the power handling of a set of 6.5''s. since i have the subs in the back, would i make more sense to just get all 6/5''s so all the power is even? it sounds stupid to me to mismatch the RMS power, because then i end up either overdriving one set or underdriving another.