Okay - I'm going to stick with the same two main types of drivers... Both shielded - leaning sorta toward some 7" Vifa woofs and some Morel tweeters... But will probably change my mind at least 3-4 more times... Right now I'm figuring that "bigger is better." Speakers must be shielded, of course... Why do folks use two smaller woofers rather than one larger one? Can you make the box smaller that way? Or go lower? Do they set them up as "three ways" with one woof acting as a mid and the other going lower? How do you calculate the box size for using two? I am thinking myself of using two woofs/speaker, simply because the center will have two - With the center, should I line everything up horizontally, or should I "triangle" 'em with the tweeter above 'em? Or is there some esoteric formula at work here? Likewise, I'm wondering - I've seen speakers with both vertically aligned woof/tweet/woofs and vertically aligned tweet/woof/woof combinations... Is there an advantage to one type? Now, where to put the port... I see that I essentially have 18 or so options (grin...). I'm narrowing it down to toward the bottom of the speaker, but wondering what different effect it'll have pointing toward the front vs. the rear... From what I've been reading, crossovers are almost as important as speaker choice and box construction - But I -seriously- lack the skills to design/build my own - what are my options?