I may be able to get a hold of one of these suckers quite cheap. usually, i wouldn't even consider a car sub for HT since most have fairly low xmax specs, but this sucker has 14.15mm, supposedly in each direction. granted, this isn't linear xmax (as far as I can tell), but still better than most car subs. in fact, i initially got all excited after running a sim through WinISD, which apparently has built in T/S parameters for an old version of this sub or simply incorrect ones. anyway, the correct specs appear to be: http://manuals.harman.com/INF/CAR/Bo...s/P12.1d_f.pdf note that Infinity cheats a bit with the "in car" sensitivity number of 96dB @ 40hz. Looking at the sample boxes they have, the out of car response seems to indicate about 95dB @ 2.83V efficiency, which is still damn good. once i got everything straight, this SEEMS to work pretty well in a smaller enclosure than say a Shiva, which is one of the main reasons i'm considering it. in fact, it seems to model (in WinISD, i can't figure out unibox just yet )very similar to a Stryke SAE-1204. I'd like to keep the sonotube around 120L if possible, but i'm somewhat flexible. with that volume, and tuned to 20hz, i get pretty good response all the way down to just below 20hz, where it finally drops to -3db. again, that's just a simulation. I'm basically shooting for SVS level performance (seems everyone is, huh?). Would like it as flat as possible down to 20hz. My room isn't all that big, but I may be moving, so who knows about the future. Sooooooo with all that said, what do you guys think?