I'm in the process of constructing my 4th centre channel. I've built all my own speakers since the idea of spending $3000-$5000/pair to get the soundI want commercially was just too much. This one will use twin 10" Kevlar drivers, twin 5" drivers (polypro) and one 1" silk dome tweeter. All are Hi-Vi Research. I'm wondering if first order crossovers are ok to use with this speaker. Box volume is about 2.7 cuft and the speaker will have a port that can be closed off or left open. Also, what about making the crossover so it does not produce a crossover point at say 400hz for the woofers and mids but instead has dedicated crossovers that overlap a bit, so 400hz for the woofers and 350hz for the mids? Would this help eliminate that dip we see at coicident crossover points normally, or would it result in too much compounding of the overlap frequencies? Thanks!