High Power Speakers are the best choice for siren and voice announcement when dealing with outdoor warning for large area coverage. The Aluminum speakers have been recognized as"the performance standard throughout the world for high power siren and protective-signaling systems. The High Power Series provides clear voice and signal transmission. This Series has excellent performance standard for high-intelligibility voice and signal transmission for outdoor warning for community, industrial signal-system and public address. With fewer loudspeakers, the cost effective, high-efficiency compression driver project sound over long distances or wide area