Mon Sep 14, 2020 11:37 am
thekek wrote: ↑Sat Sep 12, 2020 4:03 am
SirensOfNewYork wrote: ↑Thu Sep 10, 2020 4:26 pm
thekek wrote: ↑Wed Sep 02, 2020 9:43 pm
That's true, considering how effective it was in Hawaii. And I mean, European cities all have sirens such as Paris who use 8 port sirens that have a 120 db rating, granted that they are all mounted on rooftops and not poles. But don't buildings reflect sound though?
Well, the fact that buildings reflect sounds can be good and bad. It can be good because then a siren might get more coverage, but if it doesn't work and the sound just bounces back at the siren, that would not be good.
Chicago is doing pretty good with their system. San Francisco's ATIs are being treated unfairly because the sound they play over them is too low, resulting in blown drivers. I'm sure they wouldn't be in the situation they are in if they used a different tone.
One thing for sure that it will be best to use omni directional sirens for dense areas. As for SF's ATI's, they were apparently made to mimic the original system that was comprised of STL-10s. That's why they sound so low, but at least the tone is better than ATI's default tone!
Or the city could just possibly have a city wide loudspeaker with speakers mounted at every intersection and whatnot.
Something that also came to mind was Eaton/SiRcom, like what Arlington used to have. They would work well in both cases, loudspeaker and siren.
~SirensOfNewYork
Amateur HVAC, Siren, Car, Plane, and security and fire alarm enthusiast
My profile photo is not mine. It belongs to the creator of the California siren map.