Excellent info, thanks much. I'm going to order the 2" Roxul 60, 1 piece. Only have two speakers to do, looking forward to it. I'll check with Lowes and see if they have any of the 77 adhesive, we use that at work, great stuff.
While I'm thinking about it, I plan on ordering MoPads for these, they're transferring a ton of energy to the desk they're sitting on. Any objections/slaps for foolishness?