I have a buddy who is a volunteer firefighter, his department is looking to get rid of a old air raid siren that they sound anytime there is a fire call, it's kind of a tradition in volunteer FD's. They claim it costs too much to sound the thing. I suppose they are looking to "go green" with a electronic speaker siren.
I suggested putting a VFD on it to help with the cost but the more I think about it it may end up distorting the sound only running at say 75% of speed and once you go to 100% you aren't really saving much.
What says the hive?
Video of a like siren.