What if you build a sub with helium in it? - Page 6

SmarmyDog · 14th October 2005, 05:12 PM

Bill F.: As always, you present an incredible amount of useful, pertinent information in very little space. I always look forward to your posts!

I have a pending patent for the use of a full or partial vacuum on the enclosed side of the diaphragm and am always quite interested to see how others have attacked the 'self-important'

law.

In my vacuum subwoofer prototypes I use half-roll surrounds comprised of a layer of rip-stop nylon (for strength) and a layer of Mylar (to stop in- and out-gassing). It forms an extremely compliant, low loss surround with no limits on excursion. The diaphragm is ½ inch thick honeycomb-core aluminum laminate.

I love this speaker-building stuff!!!

-Casey Walsh

Bill F. · 14th October 2005, 05:31 PM

Interesting! I can't see your drawings for some reason, (could you attach one to a post?) but it sounds a lot like something I was chewing on a couple years ago. Here's an early rough drawing from my sketch archives. This one uses a DC servo motor.

Good luck!

SmarmyDog · 15th October 2005, 10:55 PM

Quote:

I can't see your drawings for some reason

FWIW, If you're using the AlternaTiff plugin, I cant get it to work in FireFox, only in IE.

ScottG · 15th October 2005, 11:01 PM

http://www.dayton-wright.com/WATSON-10_.html

15th October 2005, 11:01 PM	#54
ScottG diyAudio Member Join Date: Feb 2003 Location: US	http://www.dayton-wright.com/WATSON-10_.html __________________ perspective is everything

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14th October 2005, 05:12 PM	#51
SmarmyDog diyAudio Member Join Date: Jul 2003 Location: San Diego, CA	Bill F.: As always, you present an incredible amount of useful, pertinent information in very little space. I always look forward to your posts! I have a pending patent for the use of a full or partial vacuum on the enclosed side of the diaphragm and am always quite interested to see how others have attacked the 'self-important' law. In my vacuum subwoofer prototypes I use half-roll surrounds comprised of a layer of rip-stop nylon (for strength) and a layer of Mylar (to stop in- and out-gassing). It forms an extremely compliant, low loss surround with no limits on excursion. The diaphragm is ½ inch thick honeycomb-core aluminum laminate. I love this speaker-building stuff!!! -Casey Walsh

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