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Old 2nd September 2012, 12:52 AM   #21
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Gary Pimm (explicitly UltraTouch) & Esa Merilšinen (other cotton).

dave
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Old 2nd September 2012, 01:09 AM   #22
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Gary Pimm (explicitly UltraTouch) & Esa Merilšinen (other cotton).

dave
I've done some Googling on Ultra Touch and found much praise of it when it's used in bass traps and box damping applications. However, I couldn't find anything on its use as a closed box volume enhancer.
Checked Pimm's site. Sure looks like an electronics wizard. However, not much there on speaker applications other than some diddling with bits of carpet backing on the undersise of a woofer.

I'll see if I can find some Ultra Touch in my area and will give it a try but I'm not optimistic. Anybody tried melt blown polypropylene? It's safer than FG and about the same fiber diameter (5 um).
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Old 2nd September 2012, 01:14 AM   #23
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My initial tests seems to indicate getting the box properly braced/deadened is critical.
Adding too much insulation sucked a big hole out of the response around 100Hz to 200Hz, while only increasing the response another 10Hz.
Seems to do more harm than good
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Old 2nd September 2012, 01:28 AM   #24
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Anybody played with activated carbon? KEF has....

Home Technology eMagazine - KEF'S NEW 'ACE' TECHNOLOGY It's All To Do With Size | HomeToys
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Old 2nd September 2012, 03:19 AM   #25
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Zeolite and perlite will work in a similar fashion. I also tried Aerogel a few years back with great success. http://www.solar-components.com/aerogel.htm Aerogel(Worlds lightest solid) has way more surface area than anything on the planet..
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Last edited by Remlab; 2nd September 2012 at 03:47 AM.
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Old 2nd September 2012, 03:42 AM   #26
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Remlab,
I think I'd check into the perlite, for some reason I want to say it may contain a trace of asbestos. Just something to think about before you put that into your cabinets, especially a vented cabinet.
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Old 2nd September 2012, 03:48 AM   #27
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The Perlite is an interesting idea - if you can keep it and the dust out of the driver. 2 cubic feet goes for about $17 here.
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Old 2nd September 2012, 03:50 AM   #28
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Remlab,
I think I'd check into the perlite, for some reason I want to say it may contain a trace of asbestos. Just something to think about before you put that into your cabinets, especially a vented cabinet.
Does Perlite Contain Asbestos?
There has been growing concern that perlite may be contaminated with asbestos, making perlite a dangerous product. According to the Perlite Institute, and their continuing tests, the answer is no. The two substances are rarely found together in volcanic rock, according to a 2002 report.



Read more: What Is Perlite? | eHow.com What Is Perlite? | eHow.com
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Old 2nd September 2012, 04:09 AM   #29
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The best way to deal with those products is to fill your wife's pantyhose completely and zip tie the ends. This allows the product to interact fully with the internal air pressure, while keeping dust to an absolute minimum. Oh yeah, put them in the box before she notices, or she'll think your weird.(To late for me!)
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Last edited by Remlab; 2nd September 2012 at 04:12 AM.
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Old 2nd September 2012, 06:19 AM   #30
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SD,
Your PM seems to be off. I can try FG pretty easy. I always was told it was about the worst. When cool enough, I'll get into the attic where I have a roll I have not run out yet.

How can I have an aversion to FG? I did have a TVR for 20 years!
The rigid fiberglass used to make HVAC duct work is better than loose batting per volume filled, but Bonded Logic is even better at the lowest frequencies. They used to have an absorption coefficient table in their website, but I don't see it anymore. Many studio designers are now switching over to the BL from fiberglass.

Greg
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