Air Raid Siren

by avocado_boat Dec 30, 2017
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Double tone or single tone? I mean does it hear once or twice sound frequency

It is classical 5/6 dual tone siren, rotor has 6 wings and outer case has 5 and 6 slots so it makes that classical modulating siren sound. In the video posted only has one row of holes so the sound is not modulating like dual tone siren should. I hope this makes any sense.