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Old 15th September 2012, 01:48 AM   #11
woof is offline woof  United States
diyAudio Member
Join Date: Feb 2007
Location: Irving, TX
I had the same problem. A clip-on ferrite magnet placed on the amp power cord eliminated the noise.
Ferrite Core 3/8" Cord Noise Suppressor 110-452
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Old 19th September 2012, 07:11 PM   #12
dtproff is offline dtproff  United States
diyAudio Member
Join Date: Oct 2008
Location: Plano, TX, USA
Got it fixed... It was two different offenders. First there was a coating on the sheet metal preventing a good RF ground for the antenna (biggest contributor). Then We had to reroute the output cables in some channels (Cu tape foil over bare sheetmetal for a good ground).

Before we did this I tried most everything EMI filters on the input, put a battery on it to remove power supply noise, grounded the audio inpt and turned the gain up (still heard the noise), CM and differential chokes on the output (LC PI low pass filter with a 10MHz corner) at the speaker and then tried moving it to the output of the audio amp.

None of these worked... That's when we noticed the powder coat issue on the antenna mount.

I would like to thank everyone here for taking the time to respond. It was deeply appreciated.

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