On Mon, 6 Mar 2017 11:52:11 +0100, Dominique Michel wrote: >Le Mon, 6 Mar 2017 11:11:09 +0100, >Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx> a écrit : > >> 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. > >If it work so, you are right. But when it doesn't work so, and that can >be happening in practice, you will have to improvise and for that, you >must be systematic by using only one ground connected nearest the audio >inputs. If we warn users to remove ground, we also should warn users to do any special wiring, let alone forbidden wiring. Using the same multiple socket for computer and amp is a single point ground, period. If this shouldn't work, your wiring won't improve anything. On Mon, 6 Mar 2017 10:52:24 +0000, Bill Purvis wrote: >That amp is powered by from a mains socket in the adjacent room and we >had very significant mains hum with it until I interposed an audio >transformer. Thus no direct ground connection between the amp and the >rest of the kit. This is a workaround that should work, but might not be worth the effort. The OP would need 6 DI boxes for the galvanic isolation, one for each channel. Instead the OP could spend the money to get a good pro-sumer audio interface, to get rid of the crappy mobo audio device. Regards, Ralf _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
