Good. Just make sure you keep them away from running water 😃. Actually, some manufacturers cite maintaining medium ranges of humidity as a way to ensure long speaker life. Sounds reasonable to me.
How long does it take a decent quality speaker to "wear out"?
After all, they do have moving parts and capacitors. . . .
(I suppose that "decent quality" s a relative term. FTR, I am running a pair of the older B&W 805s, and for all I know, they may not actually meet the criteria of "decent quality.")