|By parity of reasoning, all subwoofers are defective, since deep bass does of necessity come with physical impact!|
Speaker manufacturers spend eons working on ways to damp the sound to prevent vibrations in the cabinets. The more expensive speakers will have all kinds of bracing, inner chambers and use exotic materials to damp cabinet resonances. Why? Becuase they muddy the sound, reduce resolution and linearity. You should not be hearing the sound of the cabinet reproduced in the sound. Put your hands on the backs of the ear cups when you are cranking some bass-tastic music and feel how much those cups resonate. They shouldn't be doing that; the R10 does not do this, not even the Edition 9 with its monster bass does this. This mod, while effective, does not totally eliminate the shakes, but it sure helps.
Like I said, there's nothing "wrong" with liking the Denons in stock form. Whatever floats you boat. But since the mod is essentially reversible, it would be interesting if you would try it and see what you think. Cheers.