I normaly do this without a wich, i build custom PA systems and dj systems, and use them all at the same time. i normaly use Pyle Pro woofers and tweeters. and i use a brand from car audio speakers for the subwoofer (much louder, hits lower) now i have a new design in, but im not sure about its Cuf. consits of 1 12" 1,200watt 8ohm Pyle Pro PYM1298 woofer and 5" 1,000watt 8ohm Pyle Pro PDBT58 super bullit tweeter for each PA. now my original design was a inner messure of 14"x19"x10" (WxHxL) that gave me 1.54 cuf. to work with. now is this about right or now? and yes these are ported enclosures (one 3x5 port or two 2x4 ports).