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Old 8th December 2005, 04:45 PM   #131
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Hopefully it works this time...

They definitely have to be damped. John Ötvös (Waveform) told me he used a rubber epoxy through out the cavity of his aluminum eggs. After the cabinets were completed I found it nearly impossible to reach inside with my hands and cover every area, so I tried some foam inexpensive foam matting from the crafts department at Wal Mart. Damping throughout including around the flared port (also stainless) and the back housing of the Jordan.

The result was excellent in every way. No ringing at all. My only complaint is the limited bass response as to be expected from small enclosures.
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Old 8th December 2005, 05:17 PM   #132
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They look really great!

I want a pair!

http://melhuish.org/audio/DIYBX19.html

This is my favorite sounding full range speaker to date.
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Old 9th December 2005, 01:01 AM   #133
rdf is offline rdf  Canada
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Quote:
Originally posted by Nuuk
Something isn't quite right and I can't quite put my finger on what!
Crank up some solo vocals and press your ear to the back of the cabinet.

Johnnyboy, in my case I tried constrained layer damping comprised of 1/8" aluminum sheet epoxied to linoleum floor tile and then glued to the cabinet interior, linoleum to steel. In hindsight I think the soft layer was too thick to provide maximum damping. Large machinery often uses CLD damping similar in concept but with a much thinner damping layer. All in all it was partially successful, the cabinet imparts only a bit of character to voice. No complaints about the bass though!
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Old 9th December 2005, 02:40 AM   #134
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RDF,

Thanks for the working link. Are pictures of your project posted somewhere?
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Old 9th December 2005, 03:04 AM   #135
rdf is offline rdf  Canada
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Old pic in the early stages here:

http://www.diyaudio.com/forums/showt...859#post445859

After untold hours of work I hit the point of diminishing return and never took it much further. The 657b has been replaced with a TB W4-1320SA, one of the new bamboo drivers, mostly for fun. They get pulled out now and then as another view into the sound of an amp I'm building. They still throw one heck of a soundstage. Eventually the interior will get a thick layer of felt and the exterior might get that leather wrap some day. Yeah, that's it: 'some day'. ;D
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Old 9th December 2005, 08:20 AM   #136
Nuuk is offline Nuuk  United Kingdom
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Quote:
Crank up some solo vocals and press your ear to the back of the cabinet.
I've got these working OK now by bi-amping them and I think the subject of why they don't work with a single amplifier is a subject for a new thread!
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Old 15th December 2005, 02:59 PM   #137
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some pics of a full range dipole speaker for my desk

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Rear view

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Antonello
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Old 15th December 2005, 03:04 PM   #138
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"internal" view.. whit Sonic Impact soundpads on plastic surface

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.........
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Old 15th December 2005, 03:05 PM   #139
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at work...
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Old 15th December 2005, 04:22 PM   #140
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Pretty cool, nice work. Nice use of those small speakers. I assume you're pretty happy with them?
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