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My DIY Subwoofer project
My DIY Subwoofer project
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Old 23rd October 2007, 08:24 PM   #1
toastyboy is offline toastyboy  United Kingdom
diyAudio Member
Join Date: Oct 2007
Default My DIY Subwoofer project

....still a work in progress, but I thought you might be interested in my homebuilt isobaric coupled cavity subwoofer.

It should be quite something when it is finished - at least it had better be given the amount of time I seem to be spending on it!


Let me know what you think, I'm still far from finished..

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Old 9th January 2012, 05:51 PM   #2
toastyboy is offline toastyboy  United Kingdom
diyAudio Member
Join Date: Oct 2007
Hello again!
Thanks to everyone for the encouragement!!......

Well I finished it some time ago, thought you might be interested to see the finished product.

It's a 6th order, series tuned isobaric sub, using a pair of eminence Beta 10s on a shared baffle. The enit is made from 18mm mdf, but laminated to form 36mm panels. It's a bit of a brute!

Dan McGrath's Subwoofer Project

I power it from a homemade maplin MOSFET 150w amp that I built about 20years ago... The j50 and k135 fets are still going strong!

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Old 9th January 2012, 09:46 PM   #3
cyclecamper is offline cyclecamper  United States
diyAudio Member
Join Date: May 2010
Location: Chicago IL, Long Beach CA, Vienna VA
I've been very interested in isobarics for many years. I've found little or no benefit from making small enclosures tiny, in which case the two drivers are not driven to the same excursion limit (one reaches its limit first). But for making grossly huge boxes tolerably large it's amazing.

I'm currently making some commercial-looking isobaric subs with 4 12's in each, in trapezoid cabinet kits from parts express (with lots of additional bracing).

It's interesting to note that with your 6th order bandpass it saves box volume on BOTH sides of the drivers!! That's doubly impressive.
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