My setup is as follows: Audio Technica LP5/Qed Audio 40 rca cables to Rega fono mm mk3 riaa/Kimber silver streak rca cables to Cambridge Audio CXA60 integrated amp. This setup works well with no noise. Although if I switch the Rca cables, Turntable/Kimber rca/riaa/qed rca/amp It produces a loud humming noise. I have tried to use other cables. Same result. Yesterday I tried with two sets of Audioquest Golden gate Rca´s. Same result. How can that be?