I am building this new box and have come to a certain aspect of the construction that has me stumped. For the Momo 10" how can I make (or more importantly, where can I find) the cut-out that is the model of where to cut the holes in the box for the woofers? The diameter of the sub is 10.5" and that means the radius is 5.25" ... I reduced the radius by 5/8 inch to make a radius of 4.625" which would generously allow space to bolt the sub to the box (I think). Next comes the hard part - I put a pin in the middle of my 10.5" diameter cut-out and connected a piece of rope that was 4.625" from the pin to a pencil. I then traced a new circle that came out looking accurate, but is not precise. I want this box to be a precise as possible so I figure my rigged version of the cut out is not doing the trick. Anyone have any suggestions?
Also, what is the formula for calculating cubic feet for a sub box? With this dual MM104 setup do I still try to get the .66 cubic/ft setup with 2 subs, or do I multiply that number by 2 (two subs, remember?) to get 1.32 cubic/ft?
One more question. What screws would someone use to bolt the subs to the box? The baltic birch plywood that I am using is 3/4" thick and I guess i dont want to have pointy ends sticking out of box on the inside.