Why does my iphone speaker sound quiet and muffled (like i'm covering it with my hand)?

I've tried cleaning the speaker

Has phone been dropped? Has phone gotten wet? Sweat, or steamed?
Anything in the speaker holes, oil or dirt from hands? Has anyone (toddlers) poked anything into speaker holes, putting a hole on the speaker material?

Anything that changes the shape of the speakers will cause it to sound muffled, as will anything coming in contact with the speakers. If they have been knocked out of position (dropping, poking), that also will cause this.

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