I can't begin to imagine the weight of the guys top heads if he was using Emperors as bottoms...
Seriously though, that must add some serious fatness to your snare sound. Think 80's Heavy Metal... actually I'd be willing to try that.
Odd thing was...the batter head was a Remo "Renaissance" Ambassador. Go figure. If it had been a Powerstroke 3 or some sort of dotted head, that would have made more sense to me. (The drum in question an old Ludwig "Universal" brass snare, 5.5X14.)
The head sounded like hell on the Ludwig, but just for yuks I stuck it on a mutt/mongrel snare I'm putting together ("Big R" Dynasonic shell, Tama lugs, wood counterhoops, no-name strainer...a real mess), and while I only had a few minutes to try it out this morning before I went to teach, it doesn't sound bad this way. Not quite as responsive as it was with an Attack snare side head, as one would guess, but not as unresponsive as one might expect an Emperor snare side to be. (And yes, I did check, and it is an "Emperor Snare" head, not a batter-side Emperor.) I stuck the head on the Dyna-mutt just as a lark, but I may just leave it on there - maybe replace the G1 on the batter side with an Aquarian high-energy or something along those lines.