Lehmann Audio Black Cube crackling in the acoustics


Hi, I am happy to use lehmann black cube statement + original PWX. I recently discovered an unpleasant problem. My audio system consists of: technics sl-1500c MC cartridge AT33EV, and amp Musical Fidelity M6si. I can hear the fans in the WC and bathroom turning on through the speakers. I also hear the refrigerator motor turning on. However, I don’t hear the air conditioning motor or hood in the kitchen turning on, and that’s good. The power wiring in the house is new. Please tell me this could be a problem with my lehmann black cube.  Alex

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I tested all the wall outlets in the house, they are connected to different terminals in the main distribution panel. Result: crackling everywhere. I asked a neighbor to participate in my test; in the next apartment I also heard a crash, but a little quieter. But it does happen! The drawn line from the main shield is also doubtful. I'm at a dead end. Connect wires from a pole on the street? I don’t know what to do, sell the MC cartridge and Black Cube? But I like this sound and I'm already used to the wonderful sound of the audio-technica MC AT33EV.

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Maybe this will be useful to someone.
I connected an EMI filter in front of the fan and the problem completely disappeared. The photo shows a draft version.