The noise that pours out of that stadium at game time is unnatural. It insists on being heard. On jamming Seattle's opponents signals. Through the use of small P.A.s hidden in the crowd. Do you think Seahawk security would get in the way of Seahawk cheating? If I were the 49ers, I would have plain clothes investigators watch for small P.A.s in the crowd. This is an open stadium. How are they generating that much sound in an open-air stadium? Look for extra sound amplifying equipment that... Sign in to see full entry.