Wow thanks for the great replys. I still have a lot of info to process. I hadn't really thought about an LLT but after reading the LLT Explained thread it has got me thinking about it. I'm still a bit skeptical at this point as I've never heard of this design before and I've never had a chance to hear an LLT sub, but would I love to have a couple of 18's! IB would be my first choice, but it'll be few years yet before I own a house I can poke big holes in.
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Exocer wrote:
 Everything looks good. But, why push pull? Is it that your MK subs are push-pull and you're after something familiar to the MK's?
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er.....guilty. That and a webpage I found describing different box designs said the push pull configuration was the most accurate and suitable for audiophile type listening. This is what I want, but big enough to stay that way at reference level. Also, compared to other subs I've not heard the M&K's match at quality of bass. I think it might be due to push-pull and its distortion eliminating design. Anyways, if I'm using more than one driver, why not?
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but why use 12" drivers? For not much more, 15" drivers offer a lot more displacement. And for not much more than that, there is now a very reasonably priced 18" driver that will give even more. The less a driver has to move, and the less power it need sto reach your desired output levels, the better for maintaining low distortion.
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I've never looked at it this way before. It's always been my understanding that bigger drivers were more massive and harder to control thus less accurate. Every 15" sub I've ever heard has sounded like a car sub gone wrong. Has anyone here ever built a sub and put it against top quality commercial subs and noticed an improvement? Is it really possible for a big driver to deliver good transients? At this point I am beyond convinced that it is possible and getting more excited by the minute.
As for the Q, it sounds like if I build a box that is too big, I will end up with a Q lower than .707 and the only problem that causes is the possiblilty of botteming the woofers and needing to eq the midbass a little. Is that correct? If so that makes life a heck of a lot easier. Thanks again for all the info, I will try to post some sketches of my design and my room when I find some time. btw.. What is REW and BFD?