Klipsch Reference R-40SA Dolby Atmos Add-On Speakers (Pair) - Manual (Page 8)

The only thing you should ever need to do to your speakers is dust
them occasionally. Never apply any abrasive or solvent-based cleaner
or any harsh detergent. You can clean the grilles with the brush
attachment of a vacuum cleaner.
CARE AND CLEANING
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PRODUCT REGISTRATION
WALL MOUNTING
1/4-20
3/8-16
THREADED
INSERT
THREADED
INSERT
R-50M
R-40M
R-30C