It's probably run off 480 volt, three-phase current. This sounds a lot like the STH-10 in Clinton, Michigan. They run it in attack mode for fire calls. Their old STL-10, which was located in back of the fire station was just as fast, since it ran off 480 volts.SirenMadness wrote:Great sound. I really like the faster wail in this siren better; it sounds a bit faster to me than most STH-10s.
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