my 15's are in a 5.2cf sealed box. I want to get a escalade or some 4x4 truck and put them in a ported box 7cf tuned to 32hz.I don't think you live near me but i wish you could hear my 15's, clear crisp and accurate.Hell the kicker solo x 18 won sq comps. Its all in the install.I used to run 10's, 12's, single 12's, single 15's and now dual 15's. I like how 10's sound, but when you have 15's that are as punchy, plus play low, its hard to go back to 10's.