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Message: <blockquote data-quote="Warbleed" data-source="post: 415912" data-attributes="member: 549898">Assuming they are properly designed, there really isn't any difference.A competently designed foam or rubber (butyl rubber, santoprene, etc.) surround will perform well.As far as the comparison you are making there, the D2 uses a 1.3" wide half roll foam surround, whereas the ED A used a 1" wide half roll santoprene surround.Technically speaking, the 1.3" wide surround is capable of more travel, but not because it's made of foam, because it's wider, and they are the same basic surround design (half roll).The new ED A will use a more narrow profile surround, which is much taller, and that surround is actually perfectly capable of 4" p2p. It does still have a 1" width, however.Xsus won't go that far, but the surround could handle it.</blockquote>

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