That's a regulation Mark IV stinky dog butt, required to keep the imaging consistent when I switch from one speaker to the next. I have to move a couple of feet left and right every time I switch speakers (and adjust the volume)... the dog moves back and forth with me to keep the room characteristics stable.

Just like the NRC

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