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Joined: Sep 2005
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Joined: Sep 2005
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It's hard to believe that RF may be the cause of this but still possible. Even though the horns are plastic it is possible that they have some shielding around the amp. It also possible that there is a cap or resistor difference in the amplifiers that could make one react to a RF frequency while the other works fine. If a ceiling speaker and horn have both the audio and power connected in parallel and it only effects the speaker then that eliminates many components. Have you tried to shield the ceiling speaker amp?
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Joined: Feb 2005
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If I understand correctly the noise affects all the ceiling speakers not just one. The only practical way to shield these speakers is to install them in a back can connected to a proper ground. If it were me and it came down to that I would rather rip it all out and do it the right way. Self powered speakers all over the place with power and line level audio wiring (especially home run from each speaker) is not the way to go. You're only asking for trouble.
-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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Suga Ray Jay,
Just wanted to know if you tracked down the source of the problem and corrected it ?
Thanks,
Forty six years and still fascinated with Telecommunications!
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Joined: May 2012
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Have not found the problem yet. This issue is more or less on the back burner now. I am looking into replacing the ceiling speakers though.
Jason
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Joined: Jul 2012
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I'm pulling my hair out with a somewhat similar problem... all my ceiling speakers have a low hum on them while they are idle, but none of the horns (using same power supplies) have any hum on them. I'm stumped.
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Joined: Jan 2013
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This thread is from 2012. Try starting a new one
Patrick T. Caezza
Santa Paula, CA 93060
C-7 - Low Voltage System Contractor - Lic# 992448
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