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.
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.
Attachments
Good job, it looks really good really. That accessory to adjust the Allen screws left me dumbfounded !