Anyone tighten up drivers occasionally

Out of curiosity I checked the tightness of the mounting bolts on my Revel speakers today. Probably the 2nd time I have done that in a decade. I could turn each bolt maybe 1/16 of a turn (curiously, one woofer bolt took a 1/4 turn). Anyone check their drivers on occasion? systems been off since, and wonder if I will hear anything different-