Ok, I'm definitely going to do this, but first a few questions. First, sealed or port? Single or dual opposed? 2 or 4? 15 or 18's? I like the idea of dual opposed but Erich doesn't know when he will have flat packs for 15" so maybe 2-4 singles sealed? Currently I have my subs in front right and rear left corners and I think corner placement is best in my theater. What amp would I need, some sort of berhinger? I have an SMS-1 that I currently don't use because in am using Audyssey pro with an Onkyo 5508, could the SMS be useful here? Which driver, Dayton or SI? Or is it a coin toss? I've done alot of dig acoustical treatments and have all the tools I need except maybe a router, so I think I can do this, especially since I plan on using the flat pack. I'm sure I will have alot more questions, but hopefully this will get me started! Thanks!