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...?
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M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana