connecting 2 sirens to an alarm

Hi everybody, I have seen in some post that 2 sirens can be connected to the same alarm, I would like to know if only the addition of another siren gives a louder general sound? Thanks

in a perfect world, this is basically doubling your power,so you should get a 3db increase in sound output.

If you would like to do the following..here is what I did with my Viper alarm system. I have two sirens, one under the driver side headlight..and the other mounted up under the back bumper underneath rear tail light. All wiring concealed. Each siren is different.. my front siren shoots of 2 tones, and the rear 2 different tones. Yes it is loud. The siren output of the alarm (brown wire DEI) can only push one siren. So, Using a relay connect the following... 86 to brown of alarm output, 30 to constant 12v, 87 to both red wires of sirens, and 85 to ground. But keep in mind if you have a backup battery it may not handle the load of 2 sirens for a long period of time. Hope this helps

Thanks for the replies, I am asking this question, because I get a very loud noise even with the chirp sound when arming/disarming my alarm (reference to my post : Giordon alarm weird sound). Last day when I was looking at my engine bay I noticed that the wire for the siren is a double one, and I also noticed that it was connected to a second siren which I didn't noticed because it was hided under the master cylinder. As I don't need such a loud sound I wanted to know if disconnecting one of the siren will give me a lower overall sound? Thanks

disconnecting 1 should be lower

91stt wrote: disconnecting 1 should be lower

I've just disconnected one and sound is still the same, is it possible that a relay has been connected to the system to deliver a louder sound?

It's possible, or maybe you just removed a siren that was defective or wasnt working properly because it wasnt wired properly.

You'll have to trace wires and do more hands-on investigative work if you really want to know how it was wired up.

Or you can test the siren at the battery, and if it is functional, keep it as a spare, or donate to Goodwill.

anonymous1 wrote: It's possible, or maybe you just removed a siren that was defective or wasnt working properly because it wasnt wired properly. You'll have to trace wires and do more hands-on investigative work if you really want to know how it was wired up. Or you can test the siren at the battery, and if it is functional, keep it as a spare, or donate to Goodwill.

Thanks for your advice, unfortunatly I'm not very good in electrics works, except for some little works like changing a bulb lol. I will ask the electrician who installed the alarm if the previous wiring does not have a set up that increase the overall volume of the siren