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Modulator and annoying siren
Posted: Fri Mar 21, 2008 5:45 am
by MattDean1003
Re: Modulator and annoying siren
Posted: Fri Mar 21, 2008 11:23 am
by ver tum
I've heard a siren that sounded like that before, in a video of Swiss airraid sirens. It sounds like the music from an old science fiction movie.
I believe that the first siren that started before that weird siren did was a Horman E-57. The E-57 sounds a whole lot like a Federal STL-10.
Posted: Fri Mar 21, 2008 3:03 pm
by CTsirenhunter
I've said it before and I'll say it again: I love the Swiss siren system. I have yet to see another country mix together the E-57, electronic sirens, and those terrifying and discordant but very cool Kockum KTG-9 horns. Then again, I think any simultaneous combination of sirens and horns is cool, and often more ominous than sirens alone.
Posted: Fri Mar 21, 2008 4:35 pm
by ver tum
How do those Kockum KTG-9 horns produce that terrifying sound?
Posted: Fri Mar 21, 2008 8:30 pm
by kanazo
sounds like an organ, are these electrical?
Posted: Fri Mar 21, 2008 9:37 pm
by CTsirenhunter
I know that from pictures, they appear to be several air horns sticking out of a central disk-shaped thing on a pole in all directions. I guessed that each different horn made a different tone and that they worked something like a Diaphone, but I barely understand Diaphones, so don't hold me to this...
Posted: Fri Mar 21, 2008 11:12 pm
by SirenMadness
Diaphones work like sirens in a way, in that they use chopped air to produce sound. The horns in that recording work on diaphragms, I think.
I guess I'm not the only one here who thinks that those horns actually sound scary!
Posted: Sat Mar 22, 2008 12:46 am
by kanazo
Found picture of one of these:
and another video of the "Kockum KTG-9"
http://www.youtube.com/watch?v=tYqMpzNaxBw
So they're basically just a bunch of airhorns tuned to quasi-scale that sound alternatively?
Posted: Sat Mar 22, 2008 2:11 am
by SirenMadness
They are air-horns by the looks of the housings behind the horn-throats. That circular casing underneath the horns is probably just there to protect a possible valve that redirects the air across the horn array; only one horn is hear to sound at a time. Also notice as to how the low frequency almost distorts the camera's microphone, while the high frequency just doesn't seem loud enough!
Posted: Sat Mar 22, 2008 2:20 am
by Corey Hudson
These seem to be the same.
