Up in Northern Michigan north of Grayling for the annual cousin's weekend (the guys only, need I say more?!) with my static rig. On it are two horns I rebuilt: Nathan Airchime K5L with bell numbers - , 2, 3, 4, 5. The large number 1 bell is not numbered. Some say it's a K5L, some say it's a K5LA. Sounds pretty good either way...you be the judge. The other is a Prime 920 with bells P50195, P50194, P40254; the same sounding bells as a Leslie Supertyfon S-3L: bells 25, 31 & 44. Tank is 80 gallons w/ 125 psi, horns are controlled by 2 separate Graham White 2 stage valves and air lines are 3/4 inch & regulated at 75 psi. Lanyards control the valves right off the tank.
First horn blow is about 3/4 mile away. Great echo and doppler effect! Note the typical Prime/Leslie "squeal" later in the video. Doesn't do that if the valve is opened quickly.