[SteveCallas]

I'd just give you a heads up that most IB installations can actually be made into LLTs pretty easily. Instead of leaving the rear cavity wide open, you can box it off, making it a large enclosure, and then just add a port. You'll be buying MDF anyway, so another sheet or two shouldn't be a big deal, and 8" sonotube isn't all that expensive. Rodny's experiment in which he converted his two IBs into two LLTs is well documented on this site, and he preferred the benefits the LLTs offer.