Lehmann Audio Black Cube crackling in the acoustics

Yes, the system is connected to the same home network, I just used a MM cartridge before. I upgraded and this problem appeared . But the air conditioner and kitchen hood cannot be heard to start

Ah, I meant the power circuit, not the network. If there is a noise when the fans in the bathroom turn on it might be transmitted via the power supply. Some people go as far as to use a separate circuit from the panel to the sockets supplying the audio gear to avoid that.

It is currently not possible to create a dedicated power line. We need some new solution. I replaced the fans with lower power ones, but the problem remained. A crackling sound, like a shot, at the start and when the fan is turned off. The air conditioner filter distributor is most likely not a solution to the problem.

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.