On 06/03/17 10:11, Ralf Mardorf wrote:
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.
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Not strictly Linux Audio: I've had problems with ground loops in our
church PA system.
We have a mixture of speakers, two powered Mackies, which use XLR cables
direct from
the mixer (Soundcraft Ui16), and four passive speakers which are driven
by a cheap
100+100W amp. The latter has a nasty cooling fan which makes enough
noise to be distracting
so we put it in an adjacent room, and fed both channels via a single
unbalanced audio cable.
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.
Bill
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