Subwoofer enclosure

gnanam · 18th July 2011, 07:54 AM

Hai,

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

regards
Gnanasundaram

Loren42 · 18th July 2011, 01:21 PM

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.

head_unit · 19th July 2011, 05:24 PM

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...

speakerman · 2nd November 2011, 06:10 PM

Dear Gnaman -

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

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=390-803

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,
Speakerman

ODougbo · 3rd November 2011, 08:53 AM

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

18th July 2011, 07:54 AM	#1
gnanam diyAudio Member Join Date: Mar 2011	Subwoofer enclosure Hai, I want to design sealed enclosure for my JBL cs1215 sub, sugest me best dimension. regards Gnanasundaram

2nd November 2011, 06:10 PM	#4
speakerman diyAudio Member Join Date: Mar 2010	Response to Gnaman Dear Gnaman - For the money ($100) and ease of use, The Woofer Tester is useful. For further info, go to: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=390-803 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, Speakerman

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18th July 2011, 01:21 PM	#2
Loren42 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.

19th July 2011, 05:24 PM	#3
head_unit diyAudio Member 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...

3rd November 2011, 08:53 AM	#5
ODougbo 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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