Tue Sep 21, 2010 9:18 pm
Do you mean which voice-capable sirens are loudest?
As far as I am aware, the loudest voice-capable electronic sirens produced were the Whelen WPS-4008 (130dBc @ 100ft) and the Federal Signal SiraTone EOWS*812 (132dBc @ 100ft). Both are now discontinued.
I believe that the Whelen WPS2910 is the loudest electronic siren available today. It is rated at 129dBc @ 100ft, with an estimated 70dB range of 6100 feet. The WPS4004 is also rated at 129dBc @ 100ft, with an estimated 70dB range of 6000 feet.
The ASC i-Force STi-4000 is rated at 128dB @ 100ft. I can't find a 70dB range estimate for the i-Force STi-4000, but the less powerful STi-3200 is rated at 126dB @ 100ft with an estimated 70dB range of one radial mile (5280 feet).
For comparison, the Federal Signal Modulator 6024 that you mention is rated at 121dBc @ 100ft, with a 70dBc range of 3400 feet. The more powerful Modulator 6048 is rated at 125dBc @ 100ft, with a 70dBc range of 4500 feet.
If you mean which sirens offer the clearest voice announcements, then the ASC i-Force would probably be the best, as it is marketed on its speech intelligibility. Quote: "Un-Matched Speech Intelligibility Meets MIL. UFC4-021-01 Rev. 1".
I hope that this helps.
Regards,
Jerry.