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Old 7th May 2010, 01:54 PM   #1
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Default Help for my first ever subwoofer build

Hello

i am totally new to building speakers and need some help from you guys

I am building a case for the Dayton 12" woofer. Dayton Audio - Dayton Loudspeaker - Loudspeaker Drivers - Titanic MKIII Subwoofers

The VAS is the required volume right? 2,61 ft = 0.056633 m

That means i need a case with 56.6 litres?


I wanna have a ported case for the extra deep Hz.

I anyone has a caseplan, i would the be much gratefull and ofcourse for any help and guidelines

Cheers
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Old 7th May 2010, 02:57 PM   #2
ic4ru5 is offline ic4ru5  Estonia
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+1 i'm interested in building acoustic systems. any tips, links would be useful.
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Old 7th May 2010, 03:46 PM   #3
johnr66 is offline johnr66  United States
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Join Date: Mar 2009
Quote:
Originally Posted by crimar View Post
Hello

i am totally new to building speakers and need some help from you guys

I am building a case for the Dayton 12" woofer. Dayton Audio - Dayton Loudspeaker - Loudspeaker Drivers - Titanic MKIII Subwoofers

The VAS is the required volume right? 2,61 ft = 0.056633 m

That means i need a case with 56.6 litres?


I wanna have a ported case for the extra deep Hz.


I anyone has a caseplan, i would the be much gratefull and ofcourse for any help and guidelines

Cheers
Vas is a one of the Thiele-Small loud speaker parameters the driver was tested for. It is not the enclosure volume. The enclosure volume is calculated by using the given parameters.

This site has a calculator program you can use.
Subwoofer Box Enclosure Design Calculator - Sealed Ported Bandpass Closed Vented
I entered some T/S parameters and the 12" woofer needs a 2.3 cu ft. enclosure. With a 4" port, it needs to be 27 in. long. F3 point is 22Hz, so it gets plenty low. Be sure to set the units correctly with this program.
Its limitation is that it just gives one fixed output. You can't tinker with box volume and port length to see how it affects performance.

You might need a larger port because of the noise called "chuffing" However, the length of the port means that you will have to "fold" (elbows and such) it. It might be wise to use a 3 cu ft box due to the volume consumed by the ports.
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Old 7th May 2010, 07:39 PM   #4
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Thank you for the answer, but then caluclations it only need 65 litres enclosure? Is that right?
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Old 10th May 2010, 05:51 AM   #5
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Note that a small enclosure with a low tuning and a fixed port diameter equals a very long port no matter what woofer.

I would consider a small sealed box or a moderate sized ~75litre ported enclosure tuned near 36hz,which may well give a hump in the midbass around 55hz.
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