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Joined: Oct 2010
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"Heating and cooling Zone controller ( Damper motors") Could it be possible that one of these motors is going bad electrically and either inducing noise that is being picked up by the breakroom speaker and transmitted to the rest or the noise is traveling along the power conductors of the motor back to the power source and breaker panel and finding its way to the speakers along its power leads?
Forty six years and still fascinated with Telecommunications!
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Mr Valcom,
What is the difference between the bull horn and the ceiling speaker amps?
Jason
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Joined: Feb 2005
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Nothing. With the ceiling speakers you see it mounted to the speaker frame, it has the power and audio inputs on it's board. With the horn it's inside the driver housing at the back of the speaker. Whatever you are thinking that ain't it.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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I ask to try to figure out why the noise is over the ceiling speakers but never the bull horns. Swapping power supplies or zone outputs, never changes. Just don't here the noise on bull horns. Therefor beside the obvious cosmetic look, whats different?
Jason
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Therefor beside the obvious cosmetic look, whats different?
The difference is that the horns are on a different power supply than the ceiling speakers! Read what I said above in my first post about noise on the power wiring generated by a noisy speaker amp and investigate that!
If you can't get anywhere with this and the problem is causing problems instead of just being annoying, consider removing the speakers and replacing them with standard 70 volt ceiling speakers and horns. You will need to use three PA amps or a single multi-channel unit, each channel input or amp input can supplied by the zone audio outputs of the Valcom 2003A maintaining your zone paging functionality.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Oct 2010
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"ceiling speakers mounted to the speaker frame, power and audio inputs on it's board. Horn it's inside the driver housing at the back of the speaker"
Your ceiling speakers amps are external and stray voltage could be influenced onto them possibly by a difference in ground potential. The bull horn amps are protected by the housing which is at ground potenial.
Forty six years and still fascinated with Telecommunications!
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Joined: Feb 2005
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The bull horn amps are protected by the housing which is at ground potenial.
The horns are PLASTIC.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Oct 2010
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Check grounding and make sure there are no poor loose or corroded connections. With an ohm meter check for a difference in ground potential between the speaker grounds and building ground.
Forty six years and still fascinated with Telecommunications!
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Joined: Feb 2005
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There are no speaker grounds!
Come on guys!
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: May 2012
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hbiss, please my first post. Power supplies have been changed reconfigured and ALL speakers have been powered off of just 1 power supply. Bull horns still do not make the noise while ceiling speakers do from the same power supply. Power supply is not a issue. If I cant find the source, I would like to isolate it if possible. Therefor comparing a noisy speaker to a quite one, I'm attempting to find the differences.
Jason
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