Hi everyone!! I have problem with my audio set - beosound 9000, beolab 1 and beolab 2. After replacing the cables with mk3, the sound that appeared when changing the volume or track disappeared. But there is a high-pitched squeak. It doesn't change its volume and stays the same all the time from tweeters. After changing the cables, settings and type of connections between all components, I came to some observations. The squeak appears only when I connect the subwoofer (beolab2) to the system via powerlink. Even if I turn off the power but leave the powerlink, it squeaks. After unplugging the powerlink there is silence in the speakers of beolab1. I have new mk3 cables. Beolab1 works perfect. I checked te AC power cables. Thanks for Your suggestions and support Piotr.