Svinov is a family, and even expensive models. Effect disgusting primitive scheme which amps manage to restore the background with anything. The first week on the disabled speakers was listening to a local radio station until tired. Brought the background to a minimum by doing the following:
1. wrapped the whole micronuclei connecting cable adhesive foil (do not know as correctly is called, metalized tape is). Background has not disappeared but was at 20-30 percent quieter
2. Bought a normal audio cable to speakers, just bought at the record store, there's a plug I soldered on it, and the guys were surprised when I'm on the thick cable was asked to unsolder the small stereo Jack. Von has disappeared to almost zero.