Hello there, I was looking for some advice on our school system’s PA system. We have a constant buzz coming from the speakers and I can’t pinpoint what is causing this. The buzzing is independent from the volume of the system. I’ve removed all inputs (one by one), checked every cable for a loose connection, the one way I have gotten the buzz to stop is by removing the output from the power amplifier that goes into the matrix processor. I don’t think it is a ground looping issue, but I could be wrong. I’ve included pictures of our system in the post.
We have four Shure microphones, UHF Antenna/Power Distribution, A Power Center, Disc Player (unplugged and no in use), Crown 28M Preamp/mixer, Ashly 24.24 Matrix Processor, 3 pa-9324 power amplifiers feeding to separate rooms), and lastly Crown CDi 2000 power amplifier which is sent to 6 Electro Voice PA speakers.
Let me know if a video of the buzzing/system wiring/rack components would help! Thank you very much for your time!
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