I've been tossing around the idea of getting a single 13W7 to replace my two 10W6's. But the only way I could do it is to ditch my spare tire and go with a very wide and flat bandpass enclosure.
First off, can someone point me to a source where I can learn a little more about the design, in particular the ports?
Next, how close to the plexi is too close? Can the sub sit 3" from it as long as the air volume is correct?
I used an online calculator and the numbers seem kind of unusual to me. Sealed this sub requires 1.875 and ported 2.375, do these numbers have no bearing on bandpass numbers? As you can see one design has a smaller than factory spec sealed portion, the other larger. Of course, that calculator could be bad to use also.
I went on this calculator:
Bandpass Subwoofer Box Design (Fourth-Order)
And came up with this using a .6 S factor.
Volume vented 1.04 ft
Volume sealed 1.455 ft
Freq tuned to 43.81Hz
F3 25.4
Passband 25.4-75.55
Gain .08
Figured with a .7 S factor and F3 adjusted to lower gain:
Volume vented 1.416 ft
Volume sealed 2.327 ft
Freq tuned to 37.5Hz
F3 23.1
Passband 23.1-60.9
Gain .04
Will a .6 S factor be too peaky? is it better to go with a .7 S factor which looks like a flatter response but a smaller band?
If I do this it would be in my hatch area. The flat area I have to work with is 37"x24"x7". It sits on top of the spare tire well which is 23"x17"x9". It is about 5 ft^3 total to work with.
The max depth I can work with is 16" and the sub needs 10.5" for mounting. This would only give 3-4" between the cone and the plexi, which could cause a problem. A 12W7 would give an extra inch of space and could be possible.
So, let me know what you think.
