The problem is that this calls for a really long port. I'm talking 80+ inches.
I have a Legacy wagon, so I have a decent amount of space to work with, but I'd like to keep the box height low enough so that I can still use the retractable cargo cover for the purpose of preventing theft.
The 15" Axis has an xmax of 30mm which calls for sufficient port area, which further increases the length of the port.
My original design had one slotted vent (16" x 4") wrapping around 3 sides plus a quarter of the front side, inside the box, which the subwoofer and port both front facing. I can post a drawing, or a picture of the box set up ready to be glued and screwed.
I think I got some of the measurements wrong so might have to scrap it.
I was thinking of designing a new one, with dual slotted ports (one of each side), and making things simpler with no 45 degree angles in the port (just 90/180 corners).
My question to the experiences box designers would be, how would you go about this is a client wanted a really low tuning frequency, where your options for space are kind of limited?
Maybe I will have to choice but to make the box height higher, and make the sub side-facing? I'd like easy and logical access to the wiring terminals.