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I have read lots about the woofer sections of open baffle speakers including theory and simulations, but I have not seen many builds with measurements.

I will be building and comparing a couple different versions and sharing my results.

Here is the first one, an M-Frame with two MCM 12″ woofers. From reading about this type of box, I was looking for a baffle just wide enough to hold the woofer and have the base square. With a 12.5″ baffle to hold a 12″ woofer and using 3/4″ plywood, that meant the base would be 14″x14″. I am much more of a PAD (pencil assisted design) than I am a CAD person, so I cut a board to 14″ wide and just laid the box out. I did have a highly technical scale drawing that I was working from. It went together well. I am not sure if I needed the cross brace dowel in the front, but this is crap aspen ply and I didn’t want the sides to resonate. Since I am expecting to cross this over at 200Hz, I don’t think the woofers will see the dowel.

No measurements yet.

Low root screws were used to assemble the box, all squaring cuts were done with a track saw, washers and lock nuts were used on the back side of the baffle to mount the woofers.

Attached Images

	1 sophisticated technical drawing.jpg (114.7 KB)
	2 layout.jpg (255.4 KB)
	3 crosscut sides.jpg (404.2 KB)
	4 baffle lay out.jpg (392.1 KB)
	5 baffle layout two.jpg (293.3 KB)
	6 baffle hole cut.jpg (415.4 KB)
	7 screw box together with helpers.jpg (368.2 KB)
	8 low root drilling screw.jpg (92.8 KB)
	9 last side.jpg (429.7 KB)
	10 magically square.jpg (336.5 KB)