if space is an issue just think u can fit more 10s and have more output. like 1 18 needs 6 cubes ported u can do 6 10s in the same amount of space and still have more cone area.
just finished reading over the thread again and decided to give this thing an bump im sure theres some more 10"s lovers out there that didnt see this thread while it was active.
Dang... you guys making me thinking of sticking with my 4 10's... I was gonna upgrade in the spring to 2 12" DD 2510's but I think I will wait till my sub box is done this week and see what my 10's sound like in a proper box in my new car =D
FYI this i the box I am building going into a 2007 MGM Ultimate