Re: [LAU] ground loop hell

On Sun, 2015-02-08 at 09:06 -0800, Len Ovens wrote:
> Beware old building with additions :P It appears we have power coming
> from two power entrances with two different earth grounds to the panels. I
> had found two power cords with the ground pin pulled which I replaced...
> big ground loop noise. I tried (as read from a number of sources) making
> unballanced cables with a small resitor in the ground path but this made
> things worse not better. I will be running a power cord from the stage
> back to the mixer next.

I've been doing that for the last 5 or 6 years as well. It also keeps
you from getting the crap shocked out of you when you're playing guitar
and singing ;-)

> All of our signal in paths are already isolated.
> It is only the two monitor mixes to powered monitors that are unballanced
> and causing problems. The outputs from the mixer are ballanced, but the
> lines to the stage are not... I may make cables to allow me to use two of
> the input ballanced lines instead and two more isolation boxes as a longer
> term fix. There will be a new stage going in and I have already been
> asking that power and grounding be corrected for the whole signal flow.
>
> --
> Len Ovens
> www.ovenwerks.net
>
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Received on Mon Feb 9 00:15:02 2015