Greetings, After a night of searching the forum for DIY sub information, I'm not a bit stumped. I'm a lot stumped. First, my particulars: The room is 22' x 24' with cathedral/vaulted ceilings, so about 3000 ft3. I have a hybrid 2 channel, HT setup. I have a tube preamp with an HT passthough circuit. So what happens is that in the passthough mode, my receiver mains preouts go to the tube preamp (but passthough, so nothing is done to the signal - the preamp doesn't need to be on) and from there to a 2 channel amp, to the speakers. In 2 channel mode, the receiver is bypassed, and the 2 channel source goes to tube preamp, to 2 channel amplifier, and then to the speakers. My CD player is hooked up to the tube preamp, while my SACD player is hooked up to my receiver. Hope that's clear. So as you can guess, 2 channel music is extremely important to me, but so is multichannel music, and of course, movies. The mains are Paradigm Studio 100's, v2. I want to optimize them all, and on a budget. I like the price point of the Tempest. Due to the square shape of my room, 2 channel is suffering a slight bit. Specifically, there's too much mid-bass bloat for my tastes. My initial thought is to add a sub to crossover with the mains (using a Paradigm X-30, 80Hz, for example), and use a BFD to flatten the bass. So that would indicate a sealed low Q sub. But for SACD and movies, I need an LFE channel sub; probably a ported sub. So I think I need 2 subs. One musical sub augmenting the mains, and another HT sub for the LFE channel. And then maybe another BFD for the LFE sub. But that seems very complicated and expensive. I just can't make up my mind about which Adire design (yes, I want to stick to the reference designs) would be the best compromise if I went with one sub, and I can't really see how to integrate it into my environment. The good news is that I don't care how big the sub(s) are. Size is not a concern, as this is a dedicated room, and it's all mine. To complicate things, I know very little about woodwork. But willing to learn. All help appreciated! Thanks, Martin.