My DIY Subwoofer project

toastyboy · 23rd October 2007, 08:24 PM

....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!

http://www.yourmissus.com/

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

Cheers
-Dan

toastyboy · 9th January 2012, 05:51 PM

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!

Enjoy!
Dan

cyclecamper · 9th January 2012, 09:46 PM

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.

23rd October 2007, 08:24 PM	#1
toastyboy diyAudio Member Join Date: Oct 2007	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! http://www.yourmissus.com/ Let me know what you think, I'm still far from finished.. Cheers -Dan

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9th January 2012, 05:51 PM	#2
toastyboy 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! Enjoy! Dan

9th January 2012, 09:46 PM	#3
cyclecamper diyAudio Member Join Date: May 2010 Location: was Chicago IL, now Long Beach CA	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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