Someone help me calculate the actual tuning of this box?

[Supergumby5000 5,000+ posts]

Well, im trying to get plans for an enclosure of 3.5 cubes at 33hz. When i tried to design one at those specs at this website, it came out 3.7 cubes at 30hz hehe. So one of you guys that knows how to calculate tuning, could you please check and see how close this box is and/or tell me how to calculate it?

-Dev

http://www.subwoofertools.com/forum/ported-box.asp?Ew=16&Eh=20.5&Dia=9&Xmax=20.5&Vd=.123&NumW=1&Vb=3.3&Fb=35&Qts=&Vas=&Fs=&CE=0

Click to read more...

 

[PowerNaudio 10+ year member]

http://www.subwoofertools.com/forum/ported-box.asp?Ew=16&Eh=20.5&Dia=9&Xmax=20.5&Vd=.123&NumW=1&Vb=3.5&Fb=33&Qts=&Vas=&Fs=&CE=0

i dont get your question but here is one for 3.5 at 33Hz

 

[Supergumby5000 5,000+ posts]

ah sorry, the calculator on that website is off. I put in the specs at 3.5 cubes at 33 hz on the website, and i had some guys check it for me, and it actually came out 3.7 cubes at 30hz. I am trying to use the same calculator to make a box to my desired specs, but i have to compensate for the mistakes in the calculator, hense why the link i have is .2 cubes less and .2 hz more

 

[PowerNaudio 10+ year member]

ok see now what your problem is.

have you tried using winisd or bass box pro for designing an enclosure.

theyre way more acurate then that online software and you can get a graphed idea of how the sub will output in an open environment. you can then adjust for the cabin gain for a more accurate graph and design the enclosure accordingly.

 

[Supergumby5000 5,000+ posts]

hmmm no i have not hehe are these downloadable programs?

 

[PowerNaudio 10+ year member]

winISD is

 

[Supergumby5000 5,000+ posts]

oh i have drafting programs. not worried about those. just designing a ported enclosure is where my problem lies. Dunno how to tune very well :-/ just downloaded winisd and will see if i can figure it out