I don't think we have pictures, but there really is a soundproofed room up at Axiom (accessed from Tom Cumberland's amplifier lab) which used to have an M80 sitting in it. The last couple of times we went up the room was full of subwoofer prototypes, if you're looking for another data point...

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8