A few years ago I made another Sub-Kick. I used all Yamaha Parts… so I guess it’s a Yamaha Sub Kick

Drilling the XLR into the side:

Pulling the driver from its box:

I built some Brackets and drilled the holes to line up with the existing lug hardware:

Mesh head:

Filled the lining of the shell with acoustic foam and put another mesh head on the back:

Finished: