Well, I have been reading on and off about this whole DIY subwoofer thing. And I think I'm ready to actually get down and build one. I've been wanting to achieve a subwoofer as powerful as the B4. I have had plenty of time on my hands recently for the next few months, so I'm getting nitty gritty with the whole idea. So my question to you guys..... What type of drivers should I use? How many of them? I am trying to extend the bass down to 12hz, how would I get that to reach reference levels? How would I measure and tweak the sub? I know these are very NEWBIE like questions, but I am dead set on making one! PM me, if you guys have any ideas or suggestions, anything will be greatly appreciated!! !