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

[Reuben Martin]

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.