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Subwoofer enclosure
Subwoofer enclosure
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Old 18th July 2011, 07:54 AM   #1
gnanam is offline gnanam
diyAudio Member
Join Date: Mar 2011
Default Subwoofer enclosure


I want to design sealed enclosure for my JBL cs1215 sub, sugest me best dimension.

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Old 18th July 2011, 01:21 PM   #2
Loren42 is offline Loren42  United States
diyAudio Member
Join Date: Sep 2008
Location: "Space Coast" Florida, USA
You need the Thiele-Small parameters for that 12" driver before you can do anything meaningful.

You can try to find them from the manufacture, if they will even publish them.

You may find someone that has already measured them.

Or, the best way is to measure them yourself, but the process is not trivial.

You can also just build a box larger than you think you need and add wood inside to reduce the internal volume until you get what you want.

A rough guess would be 2 or 3 cubic feet.

Lastly, you can just use the same volume for the enclosure that the driver came out of.
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Old 19th July 2011, 05:24 PM   #3
head_unit is offline head_unit  United States
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Join Date: Feb 2004
Location: Los Angeles
Yeah, some Googling did not turn up parameters for that thing.

Try asking JBL?

Otherwise I agree, maybe two cubic feet. Fortunately sealed box sizes are not so sensitive like ported. If it still sounds boomy, stuff with 2 lbs of fiberglass. If it still sounds boomy, it's just a boomy sub...
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Old 2nd November 2011, 06:10 PM   #4
speakerman is offline speakerman
diyAudio Member
Join Date: Mar 2010
Default Response to Gnaman

Dear Gnaman -

For the money ($100) and ease of use, The Woofer Tester is useful. For further info, go to:


You can hook it up to a laptop or desktop computer and directly measure the Thiele-Small (T/S) parameters.

For speaker enclosure design, there are many free software programs at various sites:
Steve Ekblad - http://www.audiogrid.com/audio/

Google Search:
http://www.google.com/search?hl=en&safe=active&q=free+loudspeaker+softwa re

Much good luck to you,
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Old 3rd November 2011, 08:53 AM   #5
ODougbo is offline ODougbo  United States
diyAudio Member
Join Date: Aug 2011
Location: Maryland USA
They use it in a tube 660 x 346, that will give you a good reference for volume:

e.g. 660 is close to 24" (L=2) and 346 is close to 12" (R=.5) use an on line calculator equals: 1.57cf

JBL CS1215 T
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