Impact of refoam on a JL 13w7

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I am currently being offered a JL 13W7 that has been refoamed. How much impact does it have in the speaker performance and parameters? I really wish to buy it, as it's being sold for 6/10th of the price. But will it be worth?
Thanks guys
 
It's my understanding that as long as the surround is the same type of material (replace foam with foam, not rubber), and the size is correct, there should be no meaningful change in driver parameters. Typically a driver's compliance is determined mostly by the spider suspension, where the surround it mostly serving to keep the driver centered.
 
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