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Old 16th October 2009, 07:37 PM   #31
badman is offline badman  United States
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And similar to what JBL did with their funky domes for a while.
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Old 18th October 2009, 12:06 AM   #32
NV&H is offline NV&H  United States
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Quote:
Originally Posted by LineArray View Post
Hi there,

i had a noise problem with a vertically folded ribbon some years ago.

I solved the problem simply by "chaotically pre wrinkling" before stamping
the folds. No noise anymore. I used a special sole used by shoemakers and
a foam rubber. I rolled the alu foil 30-40 times between rubber and
sole profile thereby using a different angle everytime.

You could hear the foil getting more silent during that preparation
by shaking it between the fingers.

No additional fabric needed, no glue ...
I did something similar to that and it did reduce the frequency at which things sounded fuzzy. Lowest I could go was about 600hz. With the hose, it never got fuzzy even at full range. Anyway, as promised, here are the photos. These are of a ribbon segment with one side showing the hose and the other not. This ribbon is silent as the grave.
Attached Images
File Type: jpg nonpantyhose side.jpg (812.8 KB, 720 views)
File Type: jpg pantyhose side.jpg (830.8 KB, 652 views)
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Old 18th October 2009, 07:02 PM   #33
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Hi,

i believe that the nylon fabric is a good solution,
epecially if you don't want to add any folds.

pic is from my ribbon, i think it was from 2002:
Attached Images
File Type: jpg BändchenInNahaufnahme_small.jpg (16.8 KB, 571 views)
File Type: jpg summary_small.jpg (14.8 KB, 561 views)
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Old 18th October 2009, 08:22 PM   #34
tinitus is offline tinitus  Europe
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I still dont get it
What is it you are doing with that fabric ?

I once made a woofer planar/ribbon with foam "surround"
Is it a kind of "surround" ?

And a hose, what is that ?

Last edited by tinitus; 18th October 2009 at 08:27 PM.
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Old 27th October 2009, 03:04 PM   #35
cpcc is offline cpcc  United States
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Default Women's accessories for audio

That looks like an old wrinkled piece of gray Duct tape to me. On the topic of just making sh-t up I know I should Probably should start a new thread but...

You get a similar effect by mounting 3/4 inch domes in the tips of a wonder bra.

You can also mount mid domes the same way using different cup sizes to tune the rear cavity.

Any other ideas using these techniques?
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Old 1st November 2009, 12:26 AM   #36
Few is offline Few  United States
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Quote:
I still dont get it
What is it you are doing with that fabric ?
He's gluing very fine flexible netting ("panty hose", as in ladies' stocking material) to the surface of the ribbon to damp the resonances. The "hose" just refers to "panty hose"; see here. It's just a nylon/aluminum composite ribbon. Great idea, though.

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Old 1st November 2009, 02:05 AM   #37
tinitus is offline tinitus  Europe
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Ah, then theres plenty to explore

Around her it has fore a long time been concluded that "japan" paper is good, you know the thin paper used fore wings on model planes

Also medical angel tape is fine, or at least very practical fore the bigger ones

Last edited by tinitus; 1st November 2009 at 02:09 AM.
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Old 8th February 2010, 04:52 PM   #38
artm is offline artm  United States
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Quote:
Originally Posted by NV&H View Post
As for the primary resonance of the ribbon; that just depends on the tension I put on it. When I pull it tight, frequency rolls off below 1khz. With no tension (i.e., no centering force), the resonant frequency is probably close to 0 hz. Afterall, a spring/mass system with a super weak spring gives a super low resonance. With no tension, I can hear rather deep base.
Interesting...I'm thinking of making a bass panel for an Apogee Caliper Signature and wouldn't mind trying this technique, as it would help in alleviating tuning issues (resonances).

But doesn't pantyhose lose elasticity after a while? Tension wouldn't be that much but still there is some.
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Old 8th February 2010, 05:41 PM   #39
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by NV&H View Post
No rattling or buzzing down low (even at 50hz) and the top is smooth as pantyhose.
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Old 9th February 2010, 03:07 AM   #40
Few is offline Few  United States
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NV&H: Any hope for some frequency response measurements? The panty hose ribbons seem like a great idea. If there's no roll-off at the high end, and no nasty resonances mid-band, I'd say it's a real winner.
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