New speed controller I got for my sirens Allertor sound on different intake 

Here a video where I am trying out a speed control motor governor to have more precise control of my sirens. This is quite the game changer.
No more fiddling with a stepped dial on the bench psu that will lock to a voltage if I wasn't adjusting it for higher & lower voltage. & no more clicking heard from the stepped dial either.
Instead set the bench psu to 23 volts & the motor governor does all the rest.
I limited airflow with a MS-190 stator on the bottom & by using the big tri blade I made got the Allertor sound on this intake.