connecting 2 sirens to an alarm
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=121322
Printed Date: May 04, 2024 at 12:42 AM
Topic: connecting 2 sirens to an alarm
Posted By: stingsan99
Subject: connecting 2 sirens to an alarm
Date Posted: April 13, 2010 at 3:14 PM
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
Replies:
Posted By: 91stt
Date Posted: April 13, 2010 at 3:26 PM
in a perfect world, this is basically doubling your power,so you should get a 3db increase in sound output.
Posted By: anonymous1
Date Posted: April 13, 2010 at 5:08 PM
Doubling the horns under my hood increased the honkability, so I dont see why not. Doubling them again, started to get ignorant people's attentions.
Posted By: jcs091570
Date Posted: April 14, 2010 at 3:33 AM
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 
Posted By: stingsan99
Date Posted: April 14, 2010 at 4:18 AM
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
Posted By: 91stt
Date Posted: April 14, 2010 at 9:16 AM
disconnecting 1 should be lower
Posted By: boxhead78
Date Posted: April 14, 2010 at 8:44 PM
just do 2 sirens and the horn ------------- boxead78
Posted By: stingsan99
Date Posted: April 18, 2010 at 5:57 AM
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?
Posted By: anonymous1
Date Posted: April 18, 2010 at 12:15 PM
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.
Posted By: stingsan99
Date Posted: April 18, 2010 at 12:54 PM
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
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