Well, my build log/thread is long long in the pages, but i took a quick hairtrick video the other day you guys might enjoy. This is the wall i deisgned for 3 of 18's not 2....
18cu.ft at 31hz. the 3rd woofers spider glue came undone so took it out for a test. moves more air with the 2 then 3
anyways crappy quality but check it out
both windows ful open btw....