The Siren Board

Wow! That's pretty loud for electronic sirens! I wonder what the DB rating is for an EOWS612.

Whelen Rules wrote:

MattDean1003 wrote:'Twas not a fin, peeps, 'twas a bracket to kinda hold everything together.

No it was to protect the belt drive rotational system on early VortexR sirens. The VortexR-4 and WPS 4004 are both rated at 129dB.

Had you been paying better attention to this thread, you would have realized that we are talking about the 4008 which had a bracket...not a fin.

So it looks like a 3016 heavily modified...

There's no information on this on the Whelen website, while the 4000 series is still in production, has the 4008 model been discontinued?

The 4008 is no longer in production. It was not very popular, and the NG 4004/R4 is only 3 dB quieter.

One test report I have for the 4004 is a Wail mode test - it sounds at between 116 and 129 dBC (in synch with the wail tone, obviously).

The other test report I have on the prototype shows that in alerting tone, measured output of the siren was 127.5 dBC at 100 feet directly in front of the horns if the alerting tone is set between 650 and 680 Hz. At an alerting tone set between 500 and 600 Hz, the measured output was 126.5 dBC to 127 dBC.

Using the speaker power law, a 4008 will have double the sound power of the 4004 - that corresponds to + 3 dB to the above figures. Individual sirens can vary 2 or 3 dB from the test data.

coyoteunknown wrote: Didn't Federal Signal actually release a Series C Thunderbolt that was capable of 131dB output at 100' in an attempt to compete against other sirens?

Yes, they did. I believe I have the service manual from Federal in my file file cabinet for that siren. Some of the very last "Series C" 1003 Thunderbolts manufactured, are in Canton Twp. Michigan.

I think the loudest vintage electronic sirens were the Whelen WPS-4008, and the Federal Siratone 812. As with modern electronic, they would be the Whelen WPS-4004, and the WPS-2910.

Whelen Rules wrote:

MattDean1003 wrote:'Twas not a fin, peeps, 'twas a bracket to kinda hold everything together.

No it was to protect the belt drive rotational system on early VortexR sirens. The VortexR-4 and WPS 4004 are both rated at 129dB.

A Klaxon ES is rated 129db@100 as well, but the whelens have a better output with the lower tone.

SirenkiD wrote:The 4008 is no longer in production. It was not very popular, and the NG 4004/R4 is only 3 dB quieter.

Here is the site with the 4008 siren info on it.

http://www.safetycom.com/sirens.html#

coyoteunknown wrote:So it looks like a 3016 heavily modified...

There's no information on this on the Whelen website, while the 4000 series is still in production, has the 4008 model been discontinued?

Heres some infoMODEL DESCRIPTION
WPS4008
Speaker Assembly:
WPS-4008 speaker, heavy duty cast aluminum rotor, 50? of speaker and rotor cable and a pole-top mounting bracket. Eight High Efficiency 400 watt speaker drivers

Electronics Cabinet:
Three compartment, natural finish aluminum

Upper Compartment:
Eight power amplifiers, system motherboard, electronic siren controller with integral timer, tone generator, local controls and microphone jack, rotor relay control, battery switch and temperature compensated battery charger.
Lower Compartments:
Four heavy duty lead calcium batteries and battery trays.
Acoustic Performance: SPL @ 100?: 130dBc
Estimated 70dB range: 6,400 feet
Standard Features:
Six warning tones
Public Address
Local Controls

Optional Features:
Diagnostic Silent Test
Remote Station Status Monitoring
Solar Power Option
Digital Voice (up to 16 pre-recorded voice messages @ 15, 30 or 60 seconds each)
Intrusion Alarm
Low Battery Alarm
Strobe Light with activation interface