If you're going to use a 10" sub, let me recommend the SV10, now being offered by meniscus audio under the name SW-1084. This woofer, with a 16mm one way xmax and Fs of 18Hz will give true HT quality bass to 20Hz in a 2 cubic foot box. It'll handle 250W. Pair it up with the Dayton 15" passive with between 800gm and 1000gm added and you'll have over 100dB from 20Hz on up without exceeding xmax.
