Rewind’s fabulous **** sandwich

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Joined 2009
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Iggy, i got you think you can find something behaving as needed from off the shelf products but you'll need to make a load of test to find the right one...
Been there, no spare time to allow for this: i choose to go for dedicated products. Ymmv. ;)

About sorbothane, yes it can behave 'elastic' on short term action but long term it doesn't behave like it. It is misleading and why they called this kind of products 'metamaterial': depending of time it change it's behavior.
A analog kind of behavior can be found in nature: quicksand. It's a natural 'metamaterial' compound (of water and sand).
 
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Finally finished the bass portion of the speaker, so here is a bit of Nirvana - Come as you are, with simple 1st order crossover. Going active soon. Soon Aadding tweeters and maybe four more Ja6681B’s in triple horn configuration. Possibilities are endless!
 
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