[LAU] Ground lifts, TRS, etc. to PA? USB/other signal crossover to audio?

[Reuben Martin]

On Friday, May 09, 2014 06:05:47 AM Ralf Mardorf wrote:
> On Thu, 2014-05-08 at 18:02 -0500, Reuben Martin wrote:
> > On Friday, May 09, 2014 12:44:00 AM Jörn Nettingsmeier wrote:
> > > On 05/08/2014 09:30 PM, Jonathan E Brickman wrote:
> > > >  AC power ground lifts sometimes have helped, sometimes
> > > 
> > > There is no such thing as an AC power ground lift. The correct term, and
> > > please don't take it personally, is _criminal_ _incompetence_.
> > 
> > It sometimes makes sense to lift the AC ground if you are pulling power
> > from more than one source. (To prevent ground loops) As long everything
> > is grounded to the remaining source correctly.
> 
> Potential difference by getting the power from different main jacks or
> experiencing ground loops, because you don't care about a correct
> grounding are no excuse to give a life-endangering "hint".
> 

I'm not suggesting to cut the ground pin off. When you use an AC ground lift 
they come with a metal ring to re-direct the ground connection so that 
equipment using different power sources can share a common ground.

Like one of these: http://www.parts-express.com/ac-3-prong-ground-lift-grounding-plug-adapter--110-211