atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Security, Alarms and Paging Speaker Noise

OK so do you hear the noise on zone 2 and 3 but not zone 1?

Yes. I have removed all but 1 zone and move it to the other zones. Ceiling speakers make the noise on any of the zones. Bull horns do not.

Fun huh? If I had longer hair I would be pulling it out.

If I got this correct you have removed the audio pair from the speaker, replaced the power cable, the 2003 controller, the power supply and connected it to another AC source but you still get the noise.

Double check all the wiring and make sure something didn't get crossed up in all the changes.
Connect a horn to the same circuit as the ceiling speakers and see if it makes the noise. Does noise volume change with the speaker volume control?

I just finished grounding the extra pairs of wires in the cat 5 cables as Bill suggested. Going to give it a day or so to see if this has helped.

Volume does change the noise level.

At one time I have connected all the speakers to the same zone. Ceiling speakers made the noise but the bull horns did not.

Could it be RF that the ceiling speaker amps are sensitive to but horn amps not?

Dirty potentiometers?

Merritt, if the building is 'Red Iron' construction and poorly grounded,that would certainly explain it.

Suga Ray Jay, try turning all the speakers down 10 degrees on their potentiometers. Hardly any drop in perceived audio level, but that last 10 degrees REALLY opens up the gain and input sensitivity.

Grounding the cat 5 cables did not work. Seems everything I'm doing is helping, but just not fixing it.

Lightninghorse, Are you referring to the master volume on the 2003A or each individual speaker? Again this system has been working well since 2001 with out any problems so I'm not sure red iron is a factor. But I'm willing to try anything.

you've replaced a bunch of stuff ($$$) spent a lot of time and are getting nowhere . why not call in a pro ?

I would

We used to run shielded single pair to the ceiling speakers because you never knew how close they would come to who knows what type of electrical devices or circuitry. We would terminate them on a 66 block equipped with a ground strap terminated at building ground. We then would take the shields and terminate them only on the 66 block ground strap.