AE Techron LVC2016, Technical Manual

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Pre-Installation 1-14
1.3 Ground Loop Removal
Hum and noise problems caused by ground loops are one of the most common
problems that plague power amplifier systems.
Theoretically, ground loops will never occur if one and only one ground path is
allowed between the LVC 608/623/2016, the signal source and the load. The
input and output grounds of the amplifier should not be externally joined since
this external ground path will form a loop with the internal ground path. The
output ground is connected to the chassis on the rear connector panel, allowing
the chassis mounting to be a possible source of ground loops. If other devices
attached to the amplifier inputs and outputs are mounted in an electrically
common rack and are likewise internally chassis-ground joined, ground loops may
be formed. When this occurs, isolate the most appropriate units from the rack so a
loop is not formed.
Another source of ground loop trouble is the third wire of the AC main connector.
Only one piece of equipment in a system should connect this terminal to the
system's signal ground.
Unintentional feedback of output signals into input signal lines can result in
system oscillations, or gain errors.
Input signals should never be supplied to the amplifier via the current carrying
output common lead. Supply the input signal to the amplifier via its own
independent ground lead, one not connected to the output signal ground.