Originally Posted by Rausch
Are you worried about figuring the footage for airspace or just the pain in the ass of angling the requirements for the shape you'll need?...
The pain in the ass of doing the internal bracing. I'm just not very good at building stuff; even with instructions, it always comes out wrong. I am going to build the box slightly bigger than I need, and then I can use acousta-fill or pillow stuffing to bring the volume down as needed.
What I need as finished product, though, is 9.3 cu. ft. of air, and 3 four inch ports 25.59" long, so that the box is tuned to 19.8 Hz. This is for an 18" home theater sub.