modulator

[Daniel]

Awesome video! That major 3rd tone was actually rather nice for an electronic siren, although as is always the case with FS, too high pitched. Still, there was no mistaking it for an ambulance. I have always believed that a 3rd interval, major or minor, is the best sound for any dual-tone siren because of its recognizability even with overtones. Others, particularly 5th interval sirens, have overtones which make the siren sound deeper and harder to recognize, something like those old 3-port Elektror sirens.

[q2bman]

Is a 2t22 a third major?

[Robert Gift]

The electronics may suffer more damage though... Now lets get back on topic of the Modulator please.
Why did Fedsignal raise the pitch of mods even higher and what made them go to dual tone sound? I think the older model single tone Mods sound a lot better.

I presume dual-tone is better if someone has a hearing deficit at one particular frequency.
They would likely hear the other frequency.

Th.is why locomotive whistles and horns are better if several tones.

Also, would the resultantone of a dual-tone siren carry further than either of the two tones produced?

Also, there may be a "loading" issue withe speaker drivers.
A voice coil may burn out if the frequency gets too low.
So their amplifiers all have a cut-off frequency where the siren tone stops.