I'll try the glass of ice water stunt on the new subs that are coming.

I don't understand though why you are lightly bumping an M3 against a 600. And why would you pick up a grain of dirt with the bottom of an M3, place the whole sordid assembly on top of another M3 and then slide it to materialize a scratch? And if the scratch was nice, why are you complaining?

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated