System sounding different on different days?

 

"I have a issue around my system sounding different on different days. I live near a industrial estate and suspect the issue may arise from the estate. My systems nearly always sounds very good sometimes it sounds freaking awesome but betwen once a week to once every two weeks the sound becomes slightly muffled. Ideally I like freaking Awesome every day. I think its RFI but have balanced mains that make a huge difference to everything; cables and everything work well. Its like a itch I cannot scratch."

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