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guess-timating fibreglass box airspace?

Old 12-17-2003, 12:08 PM
  #1  
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how do you go about guaging how much airspace you'll have in a fibreglass enclosure? I am basically doing giant kickpanels for my sub-boxes in my truck, and want to have a reasonably accurate way of figuring this out, without actually having to calculate too much.
Is this possible?
The subs I'm using need roughly 1 ft/cube each, so if it is simply close to that will it be ok?

Will I be guess-timating, or what?
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Old 12-17-2003, 01:04 PM
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once it is built, fill it with something like packagine styrofoam, then measure the foam after.
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Old 12-17-2003, 01:19 PM
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Or, once it's built take it out of the car if you can and fill it with water. To get the most accuracy, use a graduated measuring cup. Mark and count how many litres you put in until it's completely full.

Keep in mind: 1 cu ft = 28.317 liters

Take your total liter amount and divide it by 28.317

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Old 12-17-2003, 01:25 PM
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I suppose only once you'll be done your fibreglass enclosure, then you'll know what enclosure size you'll have when you measure it. So I guess you'd be going a bit backwards on it. [img]graemlins/freak.gif[/img]

A bit of trial and error needed there.
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Old 12-17-2003, 01:30 PM
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As I was scoping out my car so I could figure out where to mount my woofers I had a plastic bag filled with packing peanuts to the optimum volume. I kept shoving the bag in voids and crannies to see where I could and could not put the woofers. Crude but inexpensive and effective.
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Old 12-18-2003, 04:30 AM
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cool boys, like chadxton said though, a bit backwards....

thanks for the advice
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Old 12-18-2003, 04:37 AM
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Once youve molded the box, and measured the volume (taking into account the woofers intermal volume), you can remove extra volume easilly by adding a filler. If you need to make it bigger...
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Old 12-18-2003, 08:47 AM
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its generally alot easier at this point to subtract airspace, then to add.
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Old 12-18-2003, 04:26 PM
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Screwing up a glass box has got to be a pain and expensive.
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