Tue Feb 28, 2017 8:12 pm
Those are Banshee 15s. By 1980, ACA was ranking sirens by horsepower rather than purported decibel rating. The Banshee was being offered as a 10 or 15 horsepower single head siren. Single tone was usually 15 HP while dual tone could be 10 or 15 HP depending on what motor came in that day. There was also a Banshee 25 which was the "Super Banshee". I do not think many Banshee 25s were sold during this time period as every example I've seen was a 10 or 15.
The Banshee 15 became the OM-117 under ASC and was more or less superseded by the OM-120.