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  1. 05-21-2003 #1
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    ?'s

    My friend abcdefg got me these port dimensions ( and I am not questioning his abilities) but was wondering if these were right. The box is 7 cubic ft and the port is 18.5x6 and I want it to be tuned to 50hz. he got depth as 11.84. Just wondering if that was right.



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  3. 05-21-2003 #2
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    Re: ?'s

    Originally posted by BDIDDY
    My friend abcdefg got me these port dimensions ( and I am not questioning his abilities) but was wondering if these were right. The box is 7 cubic ft and the port is 18.5x6 and I want it to be tuned to 50hz. he got depth as 11.84. Just wondering if that was right.
    well...using WinISD 0.50a6 i got the length of the port to be....8.32".



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  4. 05-21-2003 #3
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    Re: Re: ?'s

    Originally posted by fantomas
    well...using WinISD 0.50a6 i got the length of the port to be....8.32".
    Jmac enlightened me about 10 mins ago that WinISD pro isn't so accurate in port calculations. Seems it's about 5% off.



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  5. 05-21-2003 #4
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    so then what would be an accurate tool? im about to build a ported enclosure with leftover mdf just for the hell of it....and i want it to be pretty accurate.



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  6. 05-21-2003 #5
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    Originally posted by fantomas
    so then what would be an accurate tool? im about to build a ported enclosure with leftover mdf just for the hell of it....and i want it to be pretty accurate.
    I guess manual calculations would be best... refer to Jmac for proper formula.. but seeing that it give 5% longer ports, I thoguth it'd be alright to shave just a tad off.



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  7. 05-21-2003 #6
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    actually, it was 3.52" shorter than the original calculation



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  8. 05-21-2003 #7
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    I'm as boggled as you are about this matter...

    all this time I put my trust in winISD pro, thinking that it was accurate, but alas, it proves the statement: if you want something done, do it yourself.



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  9. 05-22-2003 #8
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    im curious as to what the formula is. its probably some big extensive formula....and if you're making a program to calculate the port, why would you use the wrong formula? i think that once i find the correct formula ill program something in VB...



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  10. 05-22-2003 #9
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    Originally posted by fantomas
    im curious as to what the formula is. its probably some big extensive formula....and if you're making a program to calculate the port, why would you use the wrong formula? i think that once i find the correct formula ill program something in VB...

    I don't remember the exact formula, but it wasn't that long...

    VB, excel whatever it is, if you can make a more reliable box program than winISD pro, lemme know



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  11. 05-22-2003 #10
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    well, if you can get me the exact formula, then it shouldnt be too hard to whip up a simple program...



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  12. 05-22-2003 #11
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    Originally posted by fantomas
    well, if you can get me the exact formula, then it shouldnt be too hard to whip up a simple program...
    Paging Dr. Jmac....



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  13. 05-22-2003 #12
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    i just did a search and found a few formulas...now im reinstalling vb6..



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  14. 05-22-2003 #13
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    so is that 8.32 right???



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  15. 05-22-2003 #14
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    what about for a slot port?



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  16. 05-22-2003 #15
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    You can also use this formula:

    Fb= tuning freq., Av= cross sectional area of port (in in^2), Lv=length of port (in in.), Vb=enclosures net volume (in in.^3)
    Attached Thumbnails Attached Thumbnails ?'s-portcalculation1.jpg  




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