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  #1  
Old 06-28-2011, 10:34 PM
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Default NaN???

I'm looking around trying to get an idea on port size. I've tried 2 different port size calculators and when it calculates it says NaN. What does that mean?
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Old 06-29-2011, 12:46 AM
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Quote:
Originally Posted by GoodyearJason View Post
I'm looking around trying to get an idea on port size. I've tried 2 different port size calculators and when it calculates it says NaN. What does that mean?
It sounds like you might be using winisd or some program for it. If that is true, you will need the mechanical factors put in the parameter sheet before the proper port can be calculated. It is basically telling you that not all of the parameters required are existant in the driver information...likely qts or something like that parameter where mechanical limitations are a factor for tuning. Hope this helps
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Old 06-29-2011, 07:30 AM
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Yes sir. Last night I kept searching and I found another and it was much better. Had to enter sub and box specs instead of just box specs. It gave me what I was after. Another question... If the sub calculation gives you a combined port area of 22" does that mean your port tubes must add up to 22" or atleast close to it? That's something it didn't make clear but I'm assuming.
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Old 06-29-2011, 07:55 AM
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What do you mean?

You have 22sq in of port area? So like a 2"x11" port?
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Old 06-29-2011, 07:58 AM
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Essentially yes, but I plan on using round ports. I'm guessing 4-6" ports to give me 24"2. Close to 22"2
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Old 06-29-2011, 08:04 AM
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psp-inc.com has a great port length tool on their webpage.
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Old 06-29-2011, 08:04 AM
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4 6 inch ports iirc is 113 inches of port
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Old 06-29-2011, 08:07 AM
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Tried that one and got NaN. This is the one that worked for me. Car Audio - PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES
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Old 06-29-2011, 08:10 AM
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How big is the box
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Old 06-29-2011, 08:11 AM
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With the calculations of the subs I'm using and box size the port diameter is 22". The port area is 384.7"
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