I was looking at some UniBox graphs... Apparently, a cheap (good) sub with nice Xmax and Qts can deliver a good deal of power (close to a Titanic 10" - 12"), if the box is big enough. Even better, the response curve is just -6 dB at 20 Hz. If I do build this thing (the box is big - 150 L), is there any other thing to check for than max displacement and group delay? Is building a bigger box an easy solution to flatter frequency response with a less powerful driver? I'd assume this helps reduce overall distortion, too, since the driver doesn't have as much air resistance to overcome as in a small box... Thanks for your help! Javier.