Why don’t they use and make projector horns anymore
I guess they’re not really thought of as needed anymore given modern electronic horn & horn/strobe designs are apparently seen as loud enough the way they are already.
The PR2 projector IS still being produced by Fedsig here, but I haven’t seen the modern ones anywhere in use in person or online
I would say the reason really comes down to the modern consensus that more quiet devices is much better than less very loud devices.