I think there might be enough interest to warrant one last monster box.
I'm not 100% sure I'm going to do this yet, but we'll see.
Something like 23" x 23" x 30" would be 7.62 cuft gross, and net around 7.25 cuft for a sealed 15" or 18", dual opposed 15 or 18".
Ported would net around 7 cuft which could be tuned around 20hz with a 6" diameter port, or a little less with dual 4" ports. I guess that would mostly be for 15" woofers though. I'm not sure if there are any 18's that can be ported okay in 7 cuft.
The box would take about 1.75 sheets of mdf so it would have to be shipped in 2 different packages due to weight. I'm guessing it would weight about 100lbs.
Anyone have any 15" ported designs I should look into for this box?