I had this Titanic 12 (see the link for T-S PDF) in an 2.6 cu ft box with a 4" X 1 7/8" port and now a 4.9 cu ft box with 17" X 3 7/8 port. It goes deep but gets boomy. PE says a sealed box 2.5 cu ft is good with F3 35 Hz. But not low enough for movies. If I was willing to build something as big as a refrigerator, perhaps?