Keywords:
Signal distortion, Performance, Sound intensity, Electric power systems, Safety devices, Buildings, Approval testing, Acoustic measurement, Certification (approval), Sound reproduction, Emergency measures, Crowd safety, Speech transmission systems, Instructions for use, Audio equipment, Stadia, Control panels, Audio systems, Personnel, Warning devices, Forms (paper), Maintenance, Reception, Reliability, Inspection, Safety measures, Alarm systems, Public-address systems, Reports, Training, Audibility, Sports facilities