Here's what you need to do:
- First, decide on what SHAPE box you want to use. Square? Rectangular? Circular? The rectangular box is probably the easiest to make, so let's use rectangular for this example.
- Now, you're using 12" drivers, right? That means that at least one dimension of your box has to be more than 12". Let's set this to 14", which leaves an inch of clearance on each side of the driver.
- Each driver has a minimum mounting depth. The specs for my driver suggest that there must be at least 3" of clearance behind the driver. Let's assume your driver is 5" deep. This sets another minimum dimension of 5"+3" = 8".
- The driver itself will occupy some space in the enclosure. Let's say this is about 0.1 cu.ft. This means that the box has to be 1.5+1.1 = 1.6 cu.ft. in size.
- Working with the minimum dimensions given above, we can calculate the last dimension as follows: L = 1.6*12^3/(14*8)=24.7". Required INTERNAL dimensions for the box are therefore 14"x8"x24.7"
- If the last calculated dimension is too large (remember, these boxes have to fit in your car - add 1.5" to each dimension, then work out if they'll fit!), try increasing one of the other dimensions. For example, L1 =1.6*12^3/(15x8)=23", and required INTERNAL dimensions are therefore 15"x8"x23".
Brian
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