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Old 08-09-2011, 03:57 AM
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Default Good or bad design?

Well ive been trying to design a box that would suit my needs for another 18" sub install in the trunk.

The first few things I decided i wanted to change was:
  • advantage during build in trunk
  • smaller cuft per sub for more power handling
  • more port area
  • less box flex
  • less port flex
  • less chance of air escaping in the wrong places

The sub is bigger, with more excursion, lower qts. and lower fs

Usable airspace for the sub sits at 4.28cuft
with 112sqinches of port

brings it to 26sqinches/cuft

heres the box design:




-----------------------------------------------------

box tuning has not been decided yet. it could sit between 30hz and 34hz.

double baffled all the way around.

small box for extreme power handling.

lots of port.

easy assembly

looks sexy as hell.
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Old 08-09-2011, 05:06 AM
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Youll want to use 45s in the port. What is the tuning on the last image? Are you sure you calculated port length correctly for both, and not as one?
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Old 08-09-2011, 06:11 AM
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Quote:
Originally Posted by surreal View Post
Are you sure you calculated port length correctly for both, and not as one?
Same thing I was thinking, with 112in^2 of port and a 4.25ft^3 box, you're going to have to use a VERY long port to get a low 30's tuning. For instance, a 4.25ft^3 box with a 16"x7" port tuned to 32hz will need to be 60" long.
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