dna Posted December 30, 2021 Report Share Posted December 30, 2021 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... Quote Link to comment Share on other sites More sharing options...
DavidR Posted December 31, 2021 Report Share Posted December 31, 2021 Not a good idea to switch butyl for foam or the other way around. Some say a surround has a 'break-in' period. Foam surrounds are considered more compliant; however, each driver is designed for one or the other. Quote Link to comment Share on other sites More sharing options...
dna Posted January 1, 2022 Author Report Share Posted January 1, 2022 Hmmmm. Quote Link to comment Share on other sites More sharing options...
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