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