Sirens are out of sync?
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=26249
Printed Date: September 07, 2025 at 10:09 PM
Topic: Sirens are out of sync?
Posted By: verhobb
Subject: Sirens are out of sync?
Date Posted: February 10, 2004 at 10:07 PM
I have a Viper 791XV and originally had two piezo's inside the car and two 514n's under the hood. I just took it in to get two more sirens under the hood installed and two more piezo's. When testing it today i noticed that the Sirens jump out of sequence with each other. What is the fix for this? Do I need to add a relay? What is causing this?
Replies:
Posted By: ccroadshop99031
Date Posted: February 10, 2004 at 10:26 PM
u have all that running off of the brain u prob. are goin to burn out the alarms outputs relay's are your friend
Posted By: verhobb
Date Posted: February 10, 2004 at 10:42 PM
How will it burn up my outputs? Do I just need one relay or need two? I just had the extra four sirens installed yesterday. (two under the hood and two inside car) I will take it in first thing tomorrow to get the relay added. Could this really damage my system?
Posted By: Teamrf
Date Posted: February 10, 2004 at 10:49 PM
You will burn it up by adding by drawing more current than it able to put out. One relay will do the trick. You would damage your output to where it won't send the signal to your sirens, or it will make a very low, and weak sound when you connect this wire to your siren.
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Posted By: verhobb
Date Posted: February 10, 2004 at 10:52 PM
Is my whole brain screwed if this happens? I have only listened to it being out of sequence two or three times...i will not use the alarm until the relay is added. Is this an easy install? I hope i did not mess anything up.
Posted By: daniel2002p
Date Posted: February 11, 2004 at 6:16 AM
you will be good for now, just do not use it too much, make sure that a relay is added on ASAP.
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Posted By: S.I.Autosports
Date Posted: February 11, 2004 at 6:22 AM
Where did you have it done? If you had it done at an alarm/stereo shop hopefully they used a relay already. are all the sirens the same brand? There is probably not much you can do. Im sure there is going to be a slight variance in each siren. You might wire them so that they all have the same lenth of wire running to them. Im not sure if that would make any difference .
Posted By: verhobb
Date Posted: February 11, 2004 at 8:25 AM
I had it all done at Circuit City. I think they used a relay when I had my original 2 under hood and 2 piezo's installed. I had bought a relay...don't know if they used it for the sirens though. I was told that if I were to add 2 more piezo's and two more under hood...total of 8 sirens that I would need another relay. I will be taking it in today. All of the underhood sirens are the DEI 514n's and the piezos are the 513 t's.
Posted By: verhobb
Date Posted: February 11, 2004 at 11:58 AM
I just took my car in to the original installer. I originally had one relay put in for my four sirens that I put in when the alarm was installed. (Two under hood and two in car) Monday I added two more sirens under the hood and two more inside (total: 8 sirens) My installer today said that the reason they are off is because of the wire length and that another relay is not necessary because he put one in the first time. We are going to try and match all four wire lengths so that they will be in sync. Question: Is one relay good enough for 8 sirens? He assured me that it was and that it would probably be more difficult to get the sirens in sync by adding another relay. Since I have a relay I am in no danger of burning up my siren output...right? Let me know.
Posted By: jgold47
Date Posted: February 11, 2004 at 12:56 PM
your output should be fine... a relay can handle current draws of either 30 or 40 amps depending on the model.... for example....a sunroof motor is usually 30 amps you are way on the short side of fine....sirens dont draw a whole lot of current....
Posted By: verhobb
Date Posted: February 11, 2004 at 1:00 PM
Man i have been worrying over that SH*T for a day and a half now!! Good to know that I am not going to fry my output on the brain. I guess all the installer can try is to get the wire lenghts right and see if he can match up the tones. It sure sounds ugly right now.
Posted By: duffdog
Date Posted: February 11, 2004 at 4:31 PM
getting the same wire lengths will not improve the syncronization of the sirens, they all do not have the same timing and wont ever sound perfect. pretty much, you cant have a bunch of independent sirens work together for any reason. sounds like what you need is a pair of loud air horns. T
Posted By: jgold47
Date Posted: February 11, 2004 at 8:26 PM
but the horns not syncronized is probaly a good thing, its more annoying/ which in turn means more distinctive....
Posted By: verhobb
Date Posted: February 11, 2004 at 9:40 PM
I would have to agree with you there. I had the original installer check everything out and the 8 sirens are hooked up through the relay. We fixed the problem for the most part but the sirens are still a bit off. I think that would make people pay more attention with it sounding the way it does. I am completely satisfied now.
Posted By: S.I.Autosports
Date Posted: February 12, 2004 at 5:10 AM
What did you end up doing to improve it?
Posted By: verhobb
Date Posted: February 12, 2004 at 9:25 AM
The original installer took out the two underhood sirens that the other guy put in and matched the wire length with the original two underhood sirens. One siren has a shorter ground wire and it is still off just a bit but I can handle it. It stands out which is probably a good thing. On another note...DEI sirens are not that loud. Four is just about right for me. It's even louder with a window down because you get the four piezo's leaking there sound into the air. So, if someone were to ever break a window or open a door they will get the full blast.
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