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Sirens 101: Why so many different types?

Have you ever wondered why there are so many different siren designs in the US and Canada? Well, this video aims to introduce many of the different siren manufacturers and their siren lineups, and why these different designs exist. ACA to ASC ~1992-1993 transition period: https://www.airraidsirens.net/forums/... Timestamps: 0:00 | Copyright/Fair Use Disclaimer 0:03 | Intro 0:08 | More disclaimers/notices 0:14 | Part 1: How sirens work 3:02 | Part 2: Sound dispersal designs 3:46 | Part 3: Current sirens and siren manufacturers (in North America) 4:03 | American Signal Corporation (ASC) 5:03 | Acoustic Technology, Inc. (ATI Systems) 5:35 | Federal Signal Corporation (FS) 7:17 | Sentry Siren, Inc. (Sentry) 10:18 | Whelen Engineering Company (Whelen) 12:14 | Part 4: Defunct siren manufacturers (from North America) 12:31 | Alerting Communicators of America (ACA) 15:23 | Biersach & Niedermyer Co. (B&N / BNCO) 16:09 | Canadian Line Materials, LTD. (CLM) 17:38 | More examples (of defunct siren manufacturers) 17:56 | Part 5: A siren so special it deserves its own section 18:31 | CREDITS 19:14 | End of video CREDITS Producer, editor, and writer: Siren Archives (me) Siren information: Civil Defense Sirens Wiki, Siren Archives (me), manufacturers [credited throughout] Siren pictures: Various online sources, Siren Archives (me) [credited throughout] Siren sounds: Manufacturers, Siren Archives (me), various online sources Shoutout to:    / @warningsirensofmichiana      / @trainsandsirens1      / @mnsirens      / @4j25      / @americansirenproductions      / @goomanhlr5697      / @thesirengeek      / @northernindianaoutdoorwarn9698      / @steelcitysirensandtrains      / @dixielandfarms8628      / @ohiooutdoorwarningsirens      / @centralohsirens      / @bluegrasssirens1938      / @cameramanjohnny   Example videos: Siren Archives (me) Background music: Sundown, Bedrock - Nokia Alpha Centauri B - Anders Enger Jensen Credits music: Floaters - Jimmy Fontanez/Media Right Productions