As if Bob Rock and Randy Staub have any clue how to place a mic...bah...
But seriously, I do recall James saying in another interview that they had started with even more mics, up to 16-17 and whittled it down to a usable number. I can't even imagine trying to find a place to stick 16 mics around a couple guitar cabs. Whatever they did, they sure did it right. "Sad But True" has to be one of the heaviest guitar sounds I've ever heard.