I frequently see advertisements for speakers that say there are dents in a driver but it doesn't affect the sound. Considering all the work that goes into the cones, how can that really be true?
Using a vacuum is a very good idea. If all else fails, try grabbing some Gorilla tape and ease the sticky side into the indention. Then a gentle (or not so gentle) tug.
This sounds a bit weird but I’ve seen it done easily & successfully for a dented in soft dome Morel tweeter: simply use your mouth barely touching the tweeter & suck in like your drinking from a straw. Instant fix & sounded identical once again to the other speaker.
I had a dealer who built his own speakers back in the day and he would often remove the dust cap and get better performance.. He said it wouldn't work with all drivers.
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