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View Full Version : How do you tune a box?



Jer510
04-19-2009, 06:15 PM
How do you tune a box? or what makes a box a specific frequency? Just wondering...I'm planning on building a box for my CVRs. I already got a design from one of the members on the forum and I'm going to tune the box to 37hz.

Blue Fury
04-19-2009, 06:16 PM
Tune it by changing port length. Howd you settle with 37hz?

Jer510
04-19-2009, 06:18 PM
Tune it by changing port length. Howd you settle with 37hz?

I got a design for 2 CVR 12s from some guy on this forum. His friend has 2 CVR 12s in this box and he said that they sound really good. Also, I heard that something around 35ish hz is a good freq.

99grandprixGT
04-19-2009, 06:20 PM
so did he give you a ported box design?

Jer510
04-19-2009, 06:33 PM
so did he give you a ported box design?

yeah he gave me a ported box design for 2 CVR 12s

99grandprixGT
04-19-2009, 06:36 PM
yeah he gave me a ported box design for 2 CVR 12s

well ask him whats its tuned to.

DNick454
04-19-2009, 10:55 PM
No one statistic tunes frequency. All aspects of a box have some correlation as to the final tuning. True, making a port longer lowers the frequency, but also making the port a different size, such as cross sectional area, and modifying the box's internal volume also changes the tuning as well. I suggest just using a box calculator, they are accurate and easy to use. Just remember, you want to have enough volume as recommended by the manufacturer with the port volume subtracted. Then you make the port large enough area wise so that you don't get port noise from turbulence. Then you make the port long enough to get the right tuning. Keep in mind while making the port larger and longer you are shrinking the box's volume that the subs have, so it's basically a juggling act of tweaking each and every aspect of the box till each spec is where you want it. Then start mapping out a build plan and go at it.

Good luck :D

Stephen_c
04-19-2009, 10:58 PM
http://mmem.spschools.org/grade3science/3.sound/musicnoise.jpeg

DNick454
04-19-2009, 11:00 PM
To the above post.... "Uhhhhm... what?"

schackel
04-19-2009, 11:03 PM
http://mmem.spschools.org/grade3science/3.sound/musicnoise.jpeg

ABSO-FVCKIN-LUTLY!!!!

SPL Blazer
04-19-2009, 11:08 PM
A port calculator is a good way to figure it out. If you know someone with a Termlab they can figure it out for you, of course that doesn't work until it's already built.

Jer510
04-20-2009, 01:08 AM
where can I find a box calculator?

SPL Blazer
04-20-2009, 01:15 AM
http://www.the12volt.com/caraudio/boxcalcs.asp


http://www.carstereo.com/help/Articles.cfm?id=31

http://psp-inc.com/

Jer510
04-20-2009, 01:21 AM
http://www.the12volt.com/caraudio/boxcalcs.asp


http://www.carstereo.com/help/Articles.cfm?id=31

http://psp-inc.com/

don't get how to use the 12volt calculator

DNick454
04-20-2009, 01:24 AM
use the one on www.reaudio.com

If you're looking to design a simple single-chamber slot port design, it makes it SUPER easy. It even gives you a cut sheet ontop of that, so you don't even have to think the design out. Just punch in some specs, fiddle around with it, and cut and assemble the pieces of MDF it tells you to. It's also pretty **** accurate as far as tuning frequency.