Acoustics, special teams, and a good defense win football games.
Mostly a good defense.
"...But the noise skyrocketed to 110 decibels -- 50 times as loud -- when visiting teams were on offense, drowning out the calls of the quarterback and making last-minute adjustments at the line of scrimmage very difficult..."
"...To take advantage of this acoustic effect, Penn State plans to move the 20,000 seats in its student section squarely into the southern end zone when the entire stadium is reseated for the 2011 season. Barnard's computer model predicts that this relocation will quiet the east side of field slightly but increase the sound on the west side by almost 50 percent -- cutting the range of a quarterback's voice by another six inches and potentially causing more fall starts and penalty opportunities..."