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  #1  
Old 02-16-2011, 05:38 PM
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Default Box Tuning

Does anyone know how to actually tune a box to the hz level you want. I have always had my boxes built for me and I want to try to do my own this time. I can figure out volume and things like that but I am completely lost with the tuning. Sorry about such a newb question.
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Old 03-29-2011, 07:50 PM
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id like to know this as well. there are calcs out there for this but I like to know the math behind it.


Tim
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Old 03-29-2011, 07:54 PM
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JL Audio - Car Audio Systems
This should help a bit!
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Old 03-29-2011, 09:13 PM
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Okay if you follow the above link to the JL site you will see this formula, and it goes into detail about ports.

I read about the cross-sectional length of the port, and I understand
some of the other terms, but how do use this formula??


Im just having a really hard time wrapping my mind around this formula. Can anybody help me on this?? I know I can find port calcs and other software, but I dont just want to depend on the computer Id like to be able to do it MYSELF.

Thanks,

Tim
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Old 03-29-2011, 11:40 PM
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Fallow the guide at diyaudio.com

Learn about correction factor(flare), and it tells you everything.

http://www.diysubwoofers.org/misc/portcal.htm

Last edited by Novicaine; 03-29-2011 at 11:43 PM.
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Old 03-29-2011, 11:44 PM
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Lv = (23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv)


It is very easy, you just need to know what the letters stand for.

Dv = port diameter (cm)
Fb = tuning frequency (Hz)
Vb = net volume (litres)
Lv = length of each port (cm)
Np = number of ports
k = end correction (normally 0.732)

Find your port diameter for a circular aero port including end correction factor. If you are going slot ported, just follow this formula to convert the equivalent cross section of slot port to a round one to throw in the above equation:

Dv' = 2*((W*H)/pi)^0.5


where, Dv' = diameter of equivalent round port
W = width of slot
H = height of slot

Last edited by Novicaine; 03-30-2011 at 01:58 AM.
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Old 03-29-2011, 11:46 PM
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Port Length

  • Lv = Av*1.84*10^8/[Vb*1728*(Fb/0.159)^2]-0.823* SQRT (Av)
  • Fb = 0.159*SQRT[(Av*(1.84*10^8)]/(Vb*1728*[Lv+(.823*SQRT(Av))])
  • Vb is true net volume (all displacements taken into account)
  • Fb is the enclosures resonant frequency (tuning)
  • Av is the cross-sectional area of the port (port area)
    1. (area of a circle is pi*r^2)
    2. (area of a rectangle is h*w)
  • Lv is the length of the port
this has always helped me but i just use bbp6 or winisd
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Old 03-29-2011, 11:54 PM
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Designing Enclosures: Tutorial - Car Audio Classifieds

I made this a while ago, knock yourself out I actually have that^ equation memorized, very helpful.
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  #9  
Old 03-30-2011, 12:09 AM
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The second one looks like it calculates what a box is tunned at. The one i posted will tell you the length to make it too given your box volume, and port area, also end correction if you want(important too).
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Old 03-30-2011, 01:00 AM
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Quote:
Originally Posted by Huricain3 View Post
Lv = (23562.5*Dv^2*Np/(Fb^2*Vb))-(k*Dv)


It is very easy, you just need to know what the letters stand for.

Dv = port diameter (cm)
Fb = tuning frequency (Hz)
Vb = net volume (litres)
Lv = length of each port (cm)
Np = number of ports
k = end correction (normally 0.732)
Thanks for trying to help me but I just aint clikcing. I wrote the equation out on paper and did the numbers like we used to in algebra the ones in the () first.

And I came up with some screwed up number i cant make heads or tails of. I converted to metric when I needed to.

(23562.5*7.62/(2304*27.69))-(.732*762)
(34212750/(63797.76))-(557.8)
536.26-557.8
-21.54

Port diameter = 3 inches
Tuning freq. = 48hz
Vb = 27.69.

Where am I missing the boat?? I hate to be a noob or something but I just aint getting it.

Tim
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