The Siren Board

125dB - ACA Alertronic 5000

Mobil Directo- 125 dB

5HP CLM Siren (Carter Style) - 125 dB

I will try to find some more...

^I heard somewhere that the Mobil Directo was louder than the Allertor. Where did you get that rating from (I got the Allertor rating from the manual, where it said 126.)? As for the CLM, is "5HP CLM Siren" the official name?

Any more would be greatly appreciated.

An MD's rotor and stator are the same size as the later ACA 9/12 designs.

125? Kind of a tall order for a 5-horse siren it seems.

I got the Mobil Directo rating out of a Mobil Directo manual (Canadian and U.S versions) but it was only for electric. I have the gas MD manual but it doesn't have a dB rating. The 5HP Carter CLM came out of the Canadian archives from documents of cities installing them.

I'd take it that the gas Mobil Directos were louder than the electric ones because they were all single-tone 8 port. That is if they spun at the same speed or faster.

To add from my other post:

3HP CLM Omni-Directional: 105 dB

5HP Federal 5T: 105 dB

Let's not forget Lion King Signal.

http://www.fire-siren.com/

LK-JDL400 - 123 dB
LK-JDW145 - 123 dB
LK-M2 - 123 dBLK-JDW188 - 126 dB
LK-JDL480 - 128 dB
LK-JDW400 - 129 dB
LK-M5 - 130 dB
LK-JDW245 - 130 dB
LK-JDL550 - 131 dB
LK-JDW450 - 133 dB
LK-JDW450-2 - 134 dB
LK-STH10B - 135 dB
LK-STH10A - 136 dB
LK-STH21-2 - 137 dB
LK-STH10H - 140 dB


And I'm honestly not sure if this would count...

I've never heard of Lion King Signal before. Do they sell sirens in the US? It looks to be a Chinese company.
Also, 140 dB!?! Is that using the same decibel system that us Americans use?