PITTSBURGH — The Indianapolis Colts deny they supplemented the already loud crowd noise in the RCA Dome during Monday night's game against the Pittsburgh Steelers by pumping heavy bass noise through the stadium's speakers.

"We are doing nothing wrong," senior executive vice president Pete Ward told the Indianapolis Star. "We've got the loudest stadium in the league, with the fans naturally providing that sound."

Any crowd noise enhancement would be a violation of NFL rules, but NFL spokesman Steve Alic said the league is not investigating whether the Colts tried to make it difficult for the Steelers' offensive players to hear the snap counts.

The Steelers had no comment Thursday on the report.