On Mon, 6 Mar 2017 09:58:41 +0100, Dominique Michel wrote: >You must have 1 connection to the ground, and all the equipments must >be connected to it. Instead of following you wiring hints, the OP should follow my hint to connect the computer and amp to the same main socket by a multiple socket, ensuring that the main cables and audio cables are 100% ok. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user