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Without a safety ground on the power cable, any fault could be dangerous or even lethal. Lifting the safety ground should NEVER be done. Ever. (exception, if the amp was plugged into a listed ground fault circuit interrupter, a ground fault would open the circuit shutting off the power... BUT, if the ground loop was big enough (>6mA) it would cause the GFCI to trip anyway so it's not a practical solution for most.

 

The way it's done on the bigger shows (where folks aren't counting their last pennies) is a buffered isolation transformer with the ground paths broken on the signal side. Radial makes several safe options.

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