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Rubber VS. Foam


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I have refoamed my 17 & 58s speakers I guess I'm satisfied, I remember back in the dorm at Hickam AFB watching those 20001-1 woofers moving a WHOLE lot more than these refoamed drivers I have that are AR 8" drivers that (that are on the applications list) were used on the 17 but they are NOT 20001-1s I think the 17 model was originally foam and not butyl rubber. are the butyl rubber rings more pliable than the foam rings? I'm not sure using a butyl rubber cone surround on a driver that was designed to use foam is a good idea... the more pliable the more and easy the movement... HOWEVER...

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