It depends on where the horn is for me to decide if it is louder than usually and a bit uncomfortable. For example, the 4051s at my middle school weren’t that bad but the ones in the science wing were for some reason louder than the rest of the school. A 9838 in my high school that was in a hallway that lead down a stairwell and was a direct exit for the teen center was also louder than usual but figured that was because that hallway passage was concrete.
Regardless, the loudest alarm for me would have to be the 2DCD. My high school had two of them and they were just on the verge of being ear-piercing. One was in the assessment center which became a secondary computer lab and when it went off, I swear it made the computers in there end up going a bit staticky. The one outside the room near the Cosmetology shop wasn’t much better.
You mean the 4906 ones, including the conventional multi-candela 4906-9127? Yes, they are one of the loudest electronic horn/strobes out there, just as loud as the System Sensor SpectrAlert Advance and the Wheelock AS!
But they can’t beat the Simplex 4040 horns on Continuous at my old high school!
For me, the loudest electronic horn would have to be the classic SpectrAlert which makes me SHUDDER to think how loud the Advance and L-Series will be. Once again, it may have been the room, but in my high school, there was a classic SpectrAlert in the lecture hall and even on code-3 in there it was pretty loud, but that might have been because it was a bit echo-y or the room was an odd shape (almost like a triangle on its side.)
Loudest I’ve heard was my own 2901-9806. I have a 120 VAC Adaptahorn that I still need to make a video of, but I think the -9806 is still worse. The Simplex non-coded ∏-bar is pretty loud when you reset it, too.
I tried the BZ-50P on a 9V battery (yes), and it still was deafeningly loud, yup, I think I got a champion there, but…
… I found what appears to be a “High Power output” version of my AE&T/E2S T100 sounder, the T112N, this one, I think it requires 12V at the absolute minimum (won’t run on 9V, or so that’s what I have been told about these), 119 decibels… Hmm do we know how high (in dB) a Simplex 4051/4050 or a Amseco BZ-50P can go? I think I might be onto something there.