I want to use two of these in an Escalade Ext install under the rear seats: The entire subwoofer itself is only 4 inches high total. Anybody find any t/s parameters on it? I called Pioneer and they gave me this: Qts: .55 Fs: 31.7 Vas: .991 cu. Ft. Xmax: 8.6mm I would assume that this is not enough info to calculate optimal box size but the pioneer site reccommends between .6 and 1 cu. ft. of air space for each. At best I could get about 1.2 cu. ft. of air space for a box under the rear seats (with polyfill the box would feel more like 1.4 or so.) Questions: -Can anyone calc. box volume w/ the few t/s parameters that I have? -Can anyone build one for me! -With the use of these subs be efficacious? Your thoughts please!