After a few months of trying to integrate a martycube into my system and failing, I decided to make a purpose built triangle shaped cab to fit behind my tv. Previously a ported diy 12 sat back there.
This box is 3/4 birch ply, 5.75 ft3 net, 5x5x24.75 port, 20hz, 23ms port velocity at 1200 watts.
The whole box used 1 sheet of ply plus an extra 2x2 of the same for the end caps. Only a single baffle.
Initial impressions are very good. No measurements yet but they're coming. With test tones I can get audible port noise with all the lights lit on the inuke at 25hz. Haven't heard any during normal listening so I think I'm good.
I think I lucked out with my room and this sub placement. Every seat sounds good and the rest of the floor also sounds good. Even the middle of the room.
I painted to match the wall and added two little decorative wood ornaments to the top of the port since it sticks out. We have similar shapes throughout the house.
Add two pics of the room for reference. But those were taken a while back.
Total cost was about $75.