Very interesting, I had my M60's and current m80's over thick padding and nice carpeting for years and never noticed, but I guess I could see it happening. I assume the driver side of a speaker is much heavier than than the rear. I wonder if Axiom has ever heard of this issue?

I will never know as I had to replace with laminate flooring when our sump pump failed. Don't the speakers come with a kit anymore that include spikes and rubber feet, they used to...?
Anthem AVM60 Outlaw 7700 Emotiva A500 Epson 5040UB