| Internal Damping Material [message #14937] |
Sun, 17 April 2005 09:18  |
FredT
Messages: 704
Registered: May 2009
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Illuminati (1st Degree) |
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I was wondering if anyone has compared the materials that are commonly used for internal damping in diy enclosures? Specifically, has anyone done comparisons of eggcrate foam, R11 or R13 home insulation, and Armstrong #420 5/8" rigid fiberglass. My own superficial impression (without doing any valid measured comparisons) is that the eggcrate foam doesn't absorb very much sound, the home insulation seems to do a good job but is too thick for some appliciations, especially in small volume enclosures, and the 5/8" rigid fiberglass seems to be the most effective. I have used all three, but when I have completed an enclosure I'm not inclined to remove and reinstall damping material (especially the rigid Armstrong ceiling stuff) through the driver holes, so I haven't done any valid comparisons. Wayne, Bob, others, what do you think?
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| Re: Internal Damping Material [message #14939 is a reply to message #14937] |
Mon, 18 April 2005 12:41  |
GarMan
Messages: 960
Registered: May 2009
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Illuminati (2nd Degree) |
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I haven't had the exposure to different speakers like Wayne or Bob, but the of the four sets of cabinets I've built so far, I haven't had any problems with eggcrate not absorbing. Of course, my only method for testing is sticking my ears against the port to listen for any midrange. I've been lucky to date. gar.
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| Re: Internal Damping Material [message #14940 is a reply to message #14937] |
Mon, 18 April 2005 20:47 |
Bob Brines
Messages: 186
Registered: May 2009
Location: Hot Springs Village, AR
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Master |
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I line all of my boxes with Armstrong #420. It is much easier to work with than batting or loose fill. I find that a single layer on the four walls eat anything above 500 Hz. It cuts with a knife, holds its shape and with a little 3M #77, it stays put. Of course, I work with pipes and BR's. Stuffing a sealed box is a whole 'nother thing. Bob
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| Re: Internal Damping Material [message #14943 is a reply to message #14937] |
Thu, 21 April 2005 09:23 |
theNoid
Messages: 45
Registered: May 2009
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Baron |
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I have been building speakers and subwoofers for many years. Combined total well over 100 enclosures easily. For sealed boxes I always use the standard "fluffed" polyfill from Wal-Mart or other craft stores. For ported boxes I have always used egg-crate foam or polyfill batting glued to the inside walls. As mentioned, of the many speakers I have built, I have never had a problem nor a complaint about either. Cheap, easy, and it works. Noidster
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