In the product description it says:
"Axiom's Sturdy Little Bracket is engineered with steel frame construction and made to handle speakers weighing up to 60 lbs.* Easily affixable to the bolt on the back of Axiom's compact speakers, centers, and the outdoor Algonquins, the Sturdy Little Bracket can be tilted up or down and locked off in position with the supplied bolts. It even allows for horizontal mounting of Axiom's loudspeakers - just turn the speakers and lock them into place."
The bracket will hold up to 60lbs. There should be no problem whatsoever using it with the M22.
