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Noise is undesired sound. Please use as a general tag for questions about noise, then also use more specific tags, e. g. "noise-reduction".
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How to keep audio-fequency noise from my refrigerator out of my audio gear?
The noise seems to be coming over the power line, since it's still present even when nothing is plugged in to the amp, and the input volume controls don't affect the noise volume. … Does anyone have an idea on how to filter this noise out? …