Graeme:
Don't be so sure you were hearing 14 4x12's. A number of years ago, some musician friends and I rented the Big Room at my old studio for a New Years Eve jam party. (The owner generally didn't allow such things at the studio, but we were a bit older and all had jobs, so he knew we could and would pay if anything got damaged). The one fly in the ointment was that we were required to move the 'wall of sound' that was set up on the stage. Testament was rehearsing in the room and had a stack of more than a dozen Marshall 4x12 cabs. What we expected to be a pain-in-the-ass quickly became a piece-of-cake when we realized that three quarters of the Marshall cabs were actually empty and placed in the 'wall' merely for show! It's only rock 'n roll, but I like it. LOL
Bill, tgo