Moving the sub out of the corner may also improved the sound of bass in your room. In his great series of videos, Art Noxon of ASC talks about the high and low pressure areas in the room: standing waves build up along wall/wall, wall/floor, and wall/ceiling intersections, corners being the most problematic. ASC even makes a bass trap for use under subs, which sounds counter-intuitive but actually isn't.
subwoofer buzz - how to eliminate it
MartinLogan Dynamo 700w
At low frequencies, it vibrates, like it wants to fall apart. It does have a rubber feet, sitting on a hardwood floor, what could prevent it? Isolation feet? More rubber? Also it's facing the floor but can be turned sideways, would that help?