"Nousaine" wrote:
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If the speaker "bottoms" meaning striking some part of the basket it is often
already damaged.

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What do you mean by "striking some part of the basket?" I was referring to the
motor assembly. I'm sure it's possible but I've yet to see a woofer damaged from
a few whacks against the pole piece. I would think that if the diaphragm itself
were to strike the basket, the damage would be assured and catastrophic.