I had connected it from the phono stage to the amplifier to pass the signal from the pickup. It allowed the 50hz to pass to a deafening point with a risk for the speakers. I connected it to the grounding as well, but still the same. I changed power strips, etc. In the end, I replaced it with another cable and everything is fine. I would not recommend it. It's a shame because the sound in the moments when it played without the noise was very sweet and full. Much better than the introductory realcable it replaced.