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I replaced the fiberglass in my subwoofers with this http://www.freepatentsonline.com/6338395.htmlIt works better, bass is tighter and lower.
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Specifics and test data in Vance Dickason's "Loudspeaker Design Cookbook"I use single-density inexpensive polyester stuffing for DIY subwoofers -- eight pounds of 1.25lbs per cubic foot polyester for my two 6.5 cubic foot subwoofer enclosures (more dense does not work as well).
Polyester stuffing can be used at a density of up to 1.75 lbs. per cubic foot in smaller enclosures.
Polyester stuffing is not as efficient as fiberglas, but much nicer to work with.
Search online for an easier to read version of the article by "Mr. Subwoofer" Tom Nousaine about various polyester stuffing densities, including his measurements. The link is tough to read.
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Richard BassNut Greene
Subjective Audiophile 2007
I have altered the damping material in both my Alon speakers with the combination/addition of 100% "old fashioned" cotton stuffing in the upper 1/4 section of the bass bin where the bass driver is located.I then shifted the original fiberglass material that was stock, down into the lower 3/4 section. The combo has provided a smoother response/transition from woofer to midrange and due to the 100% cotton density, has tightened up the bass to a small degree and
bass extension seems to go a bit lower as well.I'll have to check out the Kapok stuff.
Cheers,
~kenster
I was playing around with midrange damping on my Von Schweikert VR 4JR's.
I tried fiberglass, wool, and Dacron.
I ran out of Dacron, and in desperation, cut up an expensive bed pillow!
My Dog had her way with it, and so it was time.
I expected Dacron to be in it.
Instead, it was cotton!I put the Cotton in, and it sounded so good, it is still in there!
It sounds alive and efficient, almost like no damping at all, but the coloration's are also gone!
The best of all worlds!
BTW, good for you playing with damping!
Big gains can easily be had "tuning" your speakers this way.
I have also had great luck swapping around tweeters and midranges from one side to the other!
Just listen to one speaker at a time, and try both midranges and tweeters in it until it sounds best by itself.
Once I find a combination I like, and get the damping right, I also like to just use Silicone to hold the drivers in w/o screws.
This seems to reduce cabinet talk, and open the image up.
The drivers can easily be pried out if need be.
I don't know why cotton is not used more as a damping material.I have an old Fried line tunnel subwoofer that I removed the old fiberglass material and stuffed the enclosure with the 100% cotton stuffing and combined the unit with an NHT X-1 electronic X-over/equalizer and the deep/clean resonant free bass produced from this relatively small unit was down right staggering!!! It could make my rafters creak when certain frequencies were hit :-)
I abandoned the project as I could never get the sub to seamlessly blend with any of my satellites and thus moved onto the REL concept of subbass reinforcement but it was fun as hell.
Cheers,
I was watching a CSI episode on tv last night. They used kapok wood fibers to place a perp at the scene of a crime. I don't know how that would relate to your project, but be careful.
Is the stuffing density the same? How about a before and after enclosure "Q" and fb?
Don't have the measuring equipment, except my ears and seat of pants.
I can hear, and feel a difference.
nt
all the best,
mrh
Using the kapok and lining one side with 1/8" cork and the other opposing side with hair and jute carpet underlayment will usually provide better results. You won't need to line the top or bottom or back sides but YMMV
..."The Kapoc Tree". Not exactly sure where it is/was (not too far from Boca), but I was there with an old GF back in '88 or so.Supposedly, the site of that eatery had the last Kapoc tree on it's premises. Not sure if that's true...
But the building is a Sam Ash music store. It's in Clearwater FL.
for Brides and Receptions. I will miss that location made for beautiful pics.
(NT)
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