I was just reading a thread on AA where someone mentioned that one should rotate bass drivers to prevent the voice coils from sagging. It sounds like a problem for geriatric speakers, but is there any truth to this?
Some of the weighted drivers from VMPS needed to be rotated occasionally. It's the cone that sags not the voice coil. I don't know if they are still around.
VMPS(still in business)used to weight their sub drivers in the old days and recommended they be rotated occasionally. I don't know of any other manufacturer that did this.
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