The PDF file you linked to does not have the T/S parameters. However, in the WinISD database, there are 3 - L7 12 inch subs listed, and I'm assuming yours to be the S12L7 from 2002. With a Fs of 31.2hz and Xmax of 12.7mm, the best you could do with them for HT would be 8 cubic feet ported tuned to 20hz.(each) Maximum excursion would be reached at 30hz and 18hz with 250 watts. SPL would be a respectable 110db down to 18hz, and add room gain on top of that. 2 cubic feet sealed for HT is not even a consideration with these subs. I suggest you download WinISD and do some modelling so you can see what it's all about. I would suggest using a plate amp to power these subs, as most plate amps has a subsonic filter built in, which these subs will need to protect them from frequencies under 18hz.