ACA Cyclone

The ACA Cyclone was designed by James E. Biersach of Alerting Communicators of America and presented at a Civil Defense convention in November 1968.

Like some of the other 1968 ACA siren designs, it was changed shortly after to improve performance.

These improvements included a new, simple intake, and most notably the top row of ports being straightened out, as to direct the low tone outwards for maximum range while projecting the high tone downwards to the immediate area.

This included a slightly re-designed top cover, and a ring placed around the bottom of the stator to direct the sound outwards more smoothly.

In 1980, this design was scrapped, and ACA unveiled the Cyclone 125, which came fitted with a new intake, a sound dispersion cone in the intake, and most notably a parallel stator, projecting both the high tone and low tone outwards.