Backstory: I used to have (> 15 years ago) a Peavy Black Widow 18" in a DIY enclosure that I used in conjunction with a DIY 12" sub. This was done on the cheap while I was going through college.
I've since moved on to a pair of SVS subs that I've been mostly happy with. However, I start finding myself wanting for that massive mid-bass impact that sound reinforcement speakers can deliver for movie soundtracks. So, I've gone out and picked up a JBL 2242h... but now realize that I've no idea what to do with it.
It seems in looking around the net, that internal volume of the enclosure should be between 9 and 12 cubic feet and it should be ported and tuned to 22 - 25 hz, EQ'd with a boost @ 25hz, and have a subsonic filter around 22hz to prevent excessive excursion under the tuning frequency.
I've got a false wall up front in my theater that sits 18" from the actual wall...so I'm limited in the depth of the enclosure. The rest of the enclosure can be as tall/wide as it needs to be.
I was thinking of stacking the SVS subs side-by-side on top of where the 18" driver is in the corner of the room so it may be advantageous for the enclosure to be low to the ground as well?
I need help in designing the overall dimensions of the enclosure and validation of what I've read online so far. I'm also wanting to have a slotted port, as it seems that an adequate round port would be enourmous.