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Home alarm speaker wiring

Discussion in 'General Electronics Discussion' started by P4ul, Feb 2, 2018.

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  1. P4ul


    Feb 2, 2018
    16B84DF0-588C-471E-B063-2FB1FDDD011C.jpeg Hi.
    First time poster, so sorry if this is in the wrong place.
    I have just had my ceilings plastered and the guy took down an alarm speaker, so I didn’t see how it was wired. The speak side has black and red wires, but the house wiring has four, much thinner wires - blue, black, red and yellow. How should these be wired to the read and black speaker wires?

    Any advice would be much appreciated.
  2. Kiwi


    Jan 28, 2013
    Hope you gave the guy a stern telling off!

    Are the black and blue twisted together?

    I would follow the wires back to the alarm panel to see which ones are connected. If you a really lucky the terminals will be labelled. If not, try googling the panel model to see if you can find a manual for it.
  3. ChosunOne


    Jun 20, 2010
    Paul, I can give you the technical answer, at least in part, but my experience is almost completely in North America and whatever part of the UK you're in may have standardized color code and codified wiring requirements that I'm not aware of. I know that home alarm system peripherals are generally wired differently ( a bit more complicated) in the UK/Europe than in North America. We tend not to wire most homes as if they were jewelry stores.

    You need to find the other end of that 4-wire cable and see how it's hooked up at its siren driver (may be called something else in the UK?), a PCB module that takes a DC input and modulates its output to produce the warble on the speaker. Here in the USA, we usually tuck the siren driver in the control panel cabinet, but technically it can go anywhere on the sounder loop between the control panel and speaker.

    If I knew the model of your control panel (not the keypad), I could tell you what wires to trace from the CP to find the siren driver, but it may be obvious when you look in the CP cabinet. The siren driver will have a DC input where polarity must be observed, and an output where polarity doesn't matter. The output is modulated AC.

    You'll probably find the wires paired at the driver output connections, so you'll know how to pair them at the speaker.

    Disclaimer: All alarm systems, by their nature, are customized.
    Not knowing what other components are in your system, or the layout of your home, I can only guess and may need more information if this doesn't help right away. A control panel model number and a clear picture of the stuff inside of your control panel cabinet might be helpful.

    EDIT: Drat, almost forgot: Some alarm control panels have built-in siren drivers. Took me a minute to remember that because the industry in the USA has gotten away from that in the last couple of decades. It may still be commonplace in the UK for all I know, and there may not be a separate siren driver module. That's why knowing the model number of your control panel is important.

    If the driver is integral to the panel, you should find some clue in the labeling of the wire terminals on the control panel.
    Last edited: Feb 3, 2018
  4. 73's de Edd

    73's de Edd

    Aug 21, 2015
    Sir P4ul . . . . .

    " the guy took down . . . an . . . . . alarm speaker "

    If that is indicative of a plurality, and more than one speaker, can't you just look at another unit and see how it is hooked up, to get its relative color coded connective wires ?

    73's de Edd
  5. Audioguru


    Sep 24, 2016
    I live in peaceful civilization so I have never seen a home alarm.
    What is it for? To scare away a burglar or to alert you that there is an intrusion? Smoke, CO or or fire alarm? All of the above?
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