Hi all,

I've got a Texecom Veritas 8 panel, and I'd like to add an extension speaker to it. I've already got an RKP in the kitchen, but it's too quiet for alarm conditions, hence the reason I'd like to put an extension speaker in the kitchen. I tried this yesterday, and after making a couple of strange noises, it took out the AUX and Speaker fuse (also, two of the back light LED's on the main panel keypad have gone out. is that to do with the fuses? i hope it is ) Dont worry, Im not in the trade

I think the main reason is maybe an impedance mismatch with the internal and extension speakers??? (I wired them in parallel. i believe the internal speaker is 4 ohms? i think the extension speaker I was attempting to use was maybe 2/4 or 8 ohgms, but i'll have to check it) I've also lost the installation manual, so I'm not sure how to wire it correctly. I've wired extra speakers to stereo systems before, with no problems. I do appreciate alarms are different beasts though Trouble shooting this is going to be a pain in the butt... The guy who did it made an absolute pigs ear of it. He used the two tampers from the Lounge PIR and two tampers from the back door contact to wire the RKP, there's a connector box in the attic with 5 wires going into, which I'm afraid to open etc...

Thanks.

You will need to have two wires from the control panel to where you want to locate the new extension speaker.

If you are not using the speaker in the main panel then take it out and wire the extension speaker to the speaker output. If you intend using the speaker in the panel then you will need to ensure that you dont exceed 16ohm (if memory serves me correctly). So if the first speaker is 8ohm then the second speaker should be 8ohm.

Personnaly if my alarm was in such a mess I would get a proffesional in to give it the once over and make sure it meets current standards.

Dale

Thanks for the reply dale.

Turns out the panel's own speaker was already 16 ohms, so it looks like i'll have to get something with a lower impedance. Maybe an 8 ohm? Any idea where i could get such a speaker? The one in the panel is quite small (about 3.5" estimated)

you could try gardiner security or possibly an electrical wholesaler may be able to help you. It`s a long time since i had much to do with intruder installations as i now work on fire alarms so i`m a bit rusty, but am sure if you tried one of the above they would be able to help

Wire another 16 ohm speaker in parallel and it will drop the load to 8 ohms.

(Ohms law 1/R=1/r1+1/r2)

Glenn

Extension Speakers may be connected to the Veritas as follows:

Total load must not be less than 4 ohms, e.g. 2 x 8 ohm speakers in parallel or 4 x 16 ohm speakers in parallel, or 2 2 ohm speakers in series etc.

Polarity of speakers is not important, despite the + & - markings on the terminals!

Internal speaker fitted to the Veritas range as standard is a 50mm diameter 16 ohm speaker.

I hope this clarifies the position for you!

Steve

Edited March 31, 200422 yr by Steve K

You didnt copy that directly out of the manual now did you Steve!

And its not 22 ohm, its 2 x 2 ohm in series

Dale

The lower the impedance of the speakers determins the current drawn when the speakers are being driven.. so that an 8ohm impedance draws more current than 16ohm impedance>......Could be why the fuse Blew.. When connecting speakers in parallel, you must observe the final impedance as many other engineers suggest. Many panel manufacturers suggest connecting speakers in series to avoid too low an impedance...

Thanks for the help guys! I'll give it a try this weekend

Dale, you know me better than that