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  #1  
Old 03-21-2011, 10:38 AM
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When your using a port calculator, I know that you take away the displacement of the sub, but, how can you possibly take away the displacement of the port when you dont know the volume of it until after you find the length of the port. Or do you not take take away the displacement of the port. I thought I knew how to use one until I started really thinking about it. Just a little confused.
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Old 03-21-2011, 10:52 AM
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well if you know the volume your going for then you use that volume and hte port area you need. find your port length, use that to find its displacement. (dont forget to account for port walls) and add that amount to your volume when calculating it.

hope that makes since?

edit: example

like if i wanted 2 cu ft @ 30 Hz with a 2x8.75 port i would input that find my length of 20.65 multiply 20.65x2x8.75 then divide by 1728 giving you .209 cu ft. so when calculating for volume youll look for 2.21

this equationg assumes no port walls. youll want to add the wall thickness onto the width/ height as needed

Last edited by marcotheclepto; 03-21-2011 at 10:57 AM. Reason: example
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Old 03-21-2011, 10:58 AM
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Use torres. Calculates and subtracts it automatically as you change it
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