If you need it the speaker should sound better afterward; if done well should sound as it did originally.
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Just a little true story: I found a pair of early 1970's JBLs in a second hand store for $30 the pair. The surrounds were shot. So we used little cut bits of duct tape (cut into trapezoidal shape) and used then to make a so-so duct tape surround. (trying to emulate the 'roll' in a real surround) That was many years ago. She still uses those JBLs as is, with the duct tape surround. With her $30 Marantz 2270....
This is cheap Hi fi. the real thing.
(no real connection to the op question, just a fun comment)