You can go to any material store and purchase felt. I would experiment with density by cutting it and taping it and placing it in place in different thickness.
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I agree with Djbnh that Jim's surrounds are a terrific tweak. I just posted a Positive Audiogon Feedback for Jim. I've got Acoustic Zen Adagio speakers, and they image like crazy... but being a tweaker like Djbnh... when I saw Jim's ad I couldn't resist. My Acoustic Zen Adagio's are so good my wife hasn't said one word about them. When she doesn't beat me up for buying something new, I know I'm on to something good. Jim's surrounds improved the imaging on my Acoustic Zen Adagio speakers beyond my expectations. To make a long story short, singers now sound like they're standing up instead of sitting down.
Besides the fact that I question whether someone could find surround material as substantial as Jim's product, I agree with Djbnh that there's no way someone could fabricate the surrounds as expertly as Jim did for me.
Jim's surrounds are the best tweak I've purchased in a long time.
After a slight difficulty, partially due to my own stupidity, I have mounted a pair of Jim's surrounds to my NSM 10S minimonitors, and have spent the afternoon and evening listening to favorite CDs (classical and jazz) with a new appreciation of their contents. Even Ives' 3rd symphony makes perfect sense to me, now that the complexities of his scoring have become much more evident.
This is a really excellent and effective tweak, which will no doubt become a permanent part of my system.
$49 very well spent.
Some pictures of custom fitted examples can be see in the Classified section 10/07. The so called wool products to be found in fabric and hardware stores are composed largely of synthetic materials that are themselves reflective. The pads under discussion from diffractionbegone.com are made from natural wool in the necessary depth and density. Short and spreading waveforms that would otherwise be reflected (diffracted) by naked baffles and cabinet edges and late arriving make contact with the wool instead and are absorbed. What a user gets at the listening position is purer and unadulterated information.
FYI, when diffracted waveforms sum in at the listening position, they combine to cause a bump and ripples to frequency linearity in the lower bandpass of tweeters. Not only is proper time and phase preserved, so is frequency response.