The Siren Board

Hello to whom this may concern, I'm wondering what the decibel rating of the Type B is, because I'm making a coverage map of Spartanburg County's siren system. Thanks!

Other than an STH-10, I don't have any sirens to compare to, but I would assume that the output would be around the Model 2 as it also uses a 2HP motor. It was certainly quieter than the STH-10 was.

I would say it's in the 107dBC range. A nice comparison would be a Sterling M-5, especially if it's a single tone model. Likewise, the Model "B" is louder than a Model 2, but not as loud as an STH-10.

I have a huge list of dB ratings, but the Type B isn't on it unfortunately. I know the Sterling Model M apparently put out 120, but I'm guessing that's the 10 HP model (since it's pretty much a horizontal Sentry 10V2T which also puts out 120). If the Type/Model B only has 2 HP, then I'd say 500AT's guess is pretty reasonable. I would say it's between 105 and 110.

I was gonna guess somewhere in the 102-104 range, but the sound rating alone is not a perfect calculation for a coverage ring due to the B's high pitch.

Well, I have a somewhat good dB meter application on my phone, I'll use that when I record it, to see what it may be!

Maybe this will help:

http://www.youtube.com/watch?v=R3zZZtMOUtk

Crazywarriorman wrote:Maybe this will help:

http://www.youtube.com/watch?v=R3zZZtMOUtk

That's a cool video. The only problem is, it doesn't say how far away the person was when he/she recorded the siren. dB ratings are always measured from 100 feet away (though the recorder did look about that far away). Also, with a horizontal siren like that, I would think that it differs in loudness depending on which side of it you're facing. Still, it does look like the Type B is in the neighborhood of 102 dB. I would've thought it was louder than that though.

There is also the single head Type B that has a "horn" that covers the whole chopper and stator assembly and directs all the sound in one direction.