2B or not 2B (Edwards 892-1B and 892-2B horn/strobes)

In this video, I provide an overview and demonstration of two vintage Edwards horn/strobes - the 892-1B, and the 892-2B. The 1B is a relatively quiet horn, whereas the 2B is considerably louder (about the same as an Integrity on low volume), and draws an additional 30 mA of current. In this video, they are being coded by my Simplex 4004 fire alarm control panel. Timestamps: 0:00 - Overview 1:26 - Inner workings 2:46 - Testing