Thanks for the reply Scott!.
Maybe I need to use a different modeling program?, or maybe I am doing something wrong?
With WinIsd, using 16 drivers ported, in cabinets with 14 cubes, net, so actually the outside dimensions would be significantly larger than (32), 7 cubic ft. sealed, due to the port(s) and additional bracing needed. Tuned to 15hz.
Compared to 32 drivers in 7 cubes, it seems that the sealed beat the ported, by a large margin, down to around 30hz, and have virtually the same output down to 20hz, the ported has a noticeable advantage from 18hz to 12hz, but bellow that the sealed massacres it, up to 22db more output, down to 5hz.
I like the way the Q18's model sealed, they just need a very large enclosure to make it happen, and with 32 drivers, space becomes an issue.
A couple more questions, the Q18's use a foam surround correct? Do you have any idea of the typical life expectancy of the surround? I want this to be my final theater sub design, so longevity is also a concern.
What warranty comes with the drivers? Length? If there was a faulty driver, who pays the shipping for the new driver, and the return of the old driver?
Thanks again!