Anyone know abouthe FedSig "Rumble" Siren?

[Robert Gift]

What is it's purpose?
Why? Aren't usual-sounding sirens good enough?
How does it produce low frequencies?

Has anyonever heard one?
(I never learned of it until Thursday.)
Is it effective? Or just another expensive gimmick to wa$te.

Thank you,

[Jim_Ferer]

Tell us what you have heard. I just googled "Federal rumble siren" and I got a page that talks about Federal copyrighting the "sound" of the Q siren in the same way Harley-Davidson copyrighted the "sound" of a Hog's engine.

[loudmouth]

this is kinda pointless post.

[Daniel]

When somebody writes a "does anyone know about ..." post, it is rather pointless to ask "what, why,how?" That is why this post is here. If you don't know anything about this siren, do what I do -- watch the post and let those who know something tell us about it.

[Robert Gift]

this is kinda pointless post.

Aren't all of mine?

I'm curious and would like to know about it.
Have never heard nor seen one.

Rumor is that it produces a low sound which better penetrates vehicles and carries further. Does it's output create resultantones？

Robert the -XVIII

[q2bman]

Are they vehicular or for large area warning? DO they warn for earthquakes!

[Robert Gift]

The "Rumble" siren is to augment an existing vehiclelectronic siren.

I love new and innovative stuff.
Wonder if this siren warns traffic any better or earlier?

Years ago I had thought of an electronic siren which produced 16 Hz "pulses" to see if that could be felt and heard in vehicles.
But howould one gethe power and create a speaker to couple such acoustic energy to the air?

They only way I could think was to use two higher reproduceable frequencies from regular siren speakers which would produce a low
resultant "beat" frequency.

[Jim_Ferer]

Here it is:

http://www.ilfireandpoliceequip.com/rumbler_siren.htm

[Daniel]

I wonder if it can generate "brown noise" -- that would be entertaining!

[Robert Gift]

OK, what is "brownoise"?
I can understand pink, white and blue noise.

Apparently this device is connecto existing electronic siren and creates a tone a couple octaves lower than the siren tone.

Uses two 6 inch "woofer" speakers protected within a a cylindrical enclosure. (Pretty small for "woofer" speakers.)

The man with whom I spoke seemed not very knowlegeable or communicative.