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Old 30th September 2011, 03:34 AM   #1
Westy37 is offline Westy37  Australia
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Default Using reticulated foam with waveguide loaded soft dome tweeters

I've recently loaded some seas 27tdfc soft domes in MCM6.5" waveguides ala Zaph audio:

Zaph|Audio

I'm just curious whether anyone has experimented using reticulated foam in such shallow waveguides? Would there be any advantage? I've seen it done in deeper waveguides and compression driver based set ups but not with soft domes.

For those unfamiliar with this idea of using foam in waveguides see this site:
Red Spade Audio: Waveguide foam mod
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Old 30th September 2011, 12:27 PM   #2
sreten is offline sreten  United Kingdom
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Hi, I can't see any issues it would address for that combination, rgds, sreten.
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Old 30th September 2011, 01:24 PM   #3
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I agree with sreten. I wouldn't bother with foam in the throat on that horn (it's lovely). If anything, wrap the edges of the horn with thicker foam (or felt) to prevent some highs from hitting the baffle edges.

check out post 3, long read but worth it for a free improvement. Granted, the conical has a steep edge, while the mcm goes smooth into the baffle. Foam around the edge works for my ev hr90, klipsch rb 75, and mcm 6.5" round horn.

Geddes on Waveguides

Conical Horn Dip

Norman
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Old 30th September 2011, 03:44 PM   #4
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Quote:
Originally Posted by Westy37 View Post
I'm just curious whether anyone has experimented using reticulated foam in such shallow waveguides? Would there be any advantage? I've seen it done in deeper waveguides and compression driver based set ups but not with soft domes.

For those unfamiliar with this idea of using foam in waveguides see this site:
Red Spade Audio: Waveguide foam mod
Just so you know, Dr. Geddes has patented this idea of using reticulated foam in waveguides... You have to ask his permission to make, use, or sell anything with this feature in the U.S. I don't know if he has any international patents on it though...
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Old 30th September 2011, 04:33 PM   #5
Ile is offline Ile  Finland
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Originally Posted by dirkwright View Post
Just so you know, Dr. Geddes has patented this idea of using reticulated foam in waveguides... You have to ask his permission to make, use, or sell anything with this feature in the U.S. I don't know if he has any international patents on it though...
Patent doesn't mean nothing if he makes those for his own use, patents only try to protect agains commersial copying.
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Old 30th September 2011, 05:18 PM   #6
jcx is offline jcx  United States
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Quote:
Originally Posted by Ile View Post
Patent doesn't mean nothing if he makes those for his own use, patents only try to protect agains commersial copying.
not true in the US

practically there's little chance of being caught but US patents prevent "...make, use, sell"

there can be argument over "investigational use" - but bragging on the web about daily "use" in your home theater system could in principle get you a lawsuit
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Old 30th September 2011, 05:39 PM   #7
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Originally Posted by jcx View Post
not true in the US

practically there's little chance of being caught but US patents prevent "...make, use, sell"

there can be argument over "investigational use" - but bragging on the web about daily "use" in your home theater system could in principle get you a lawsuit
That is correct. The patent enables the owner to prevent anyone from making, using or selling their invention. It's called an infringement suit. So, if you want to do this and talk about it openly, I would suggest getting permission from Dr. Geddes first, in addition to reading his patent. At the very least, it is the polite thing to do. He worked hard on that invention and another person's making, using or selling it amounts to stealing of intellectual property.
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Old 30th September 2011, 05:44 PM   #8
badman is offline badman  United States
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Just for completeness sake- his patent I believe only covers >80% fill rates, a small amount just in the throat pre-dates his use.
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Old 1st October 2011, 08:23 AM   #9
Westy37 is offline Westy37  Australia
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Thanks for the informative replies. Have some SAE-11 felt on the way to experiment with baffle diffraction so may end up using some around the transition from the waveguide to the baffle.
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Old 1st October 2011, 10:53 AM   #10
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you will notice a sharpness. You can really hear what a recording studio does to a woman's voice (reverb, sustain, etc). We look forward to your results (don't forget the pics).

Norman

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Last edited by norman bates; 1st October 2011 at 10:59 AM. Reason: added pics
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