Lehmann Audio Black Cube crackling in the acoustics

Are both circuits on the same side of the breaker panel? If so have one moved to the other side and see if that cures the problem!

Thanks, I'll do a test. But it’s strange, I bought a Chinese 18W fan with a control panel, plugged it into the wall and everything is fine, no crackling in the speakers. In all likelihood, it has a “soft start”. But the problem is that it starts only from the control panel.

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.