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Hi H4nco
When you have a cable plugged in and get the noise, is there anything on the other end of the cable (mixer, monitor controller or whatever) or just an 'open' cable?
If it is simply an open cable then it is acting as an aerial as mentioned previously.
Are you close to the received radio station's transmitting aerial?
I would have a go with ferrite rings or RF filters on the cables as close to the monitor amp/speaker as possible.
More experimentation needed I am afraid.
Matt S
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