It is unlawful for any person to wilfully make or continue, or cause to be made or continued, any noise disturbance in such a manner that the sound is plainly audible twenty-five feet within the real property boundary in a residential area. This section shall not in any way restrict or limit sounds emanating from organized and sponsored outdoor recreational, school, or athletic events that are part of a regularly scheduled program of activity. (Ord. 1574-98 §3(part), 1998).