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Old 7th October 2011, 01:25 PM   #1
spot is offline spot  Australia
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Default Motion Feedback Subwoofer

Hi,

I've been reading the article in 'Electronics World' 1997 called 'Roaring subwoofer'.
Looking at the feedback loop it seems as though it might work, with about 26dB feedback - not huge but very beneficial. This has got me wanting to make one (but with 12" woofers).

I would be really interested to hear from people who have actually tried this sort of thing how it went, expecially how good the feedback sensing was. This design uses a second voice coil - that may have practical issues with coupling from the other coil & what happens outside of xmax. It seems microphones might have a problem with sensing too much of other sounds. Haven't hear any serious complaints about accelerometers yet (except price).

(It seems a good idea at the outset might be to build some protection circuitry so if it goes crazy it will cutout quickly)
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Old 7th October 2011, 09:11 PM   #2
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I can't really help with this but I found the article and you should know that Russel Breden is an alias of Jeff Macaulay (jeff macaulay's audio amp designs) .

article: http://www.macaulayaudio.co.uk/roaring%20sub.pdf
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Old 7th October 2011, 10:54 PM   #3
spot is offline spot  Australia
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Quote:
Originally Posted by revboden View Post
I can't really help with this but I found the article and you should know that Russel Breden is an alias of Jeff Macaulay (jeff macaulay's audio amp designs) .

article: http://www.macaulayaudio.co.uk/roaring%20sub.pdf
That was the article that got me interested all over again!
I hadn't seen Jeffs web pages though, will be interesting to see his updated design when it comes out.
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Old 8th October 2011, 12:36 AM   #4
spot is offline spot  Australia
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Quote:
Originally Posted by spot View Post
Hi,
... about 26dB feedback ...
Oops, its less than this
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Old 8th October 2011, 01:07 AM   #5
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That's a good article. I licensed a similar design to Linear Power in the 80's,
so it was nice of Jeff to wait until after I got paid to publish it.

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