ART Pro Audio SLA2 - 200W Power Amplifier - Manual (Page 12)

12
GROUND LIFT SWITCH
This switch is used to disconnect the internal ground signal from the
chassis (case) ground. This may be used to reduce 50/60Hz noise
(hum or buzz). Normally you would ground the chassis, for best
shielding. When the SLA-2 is mounted in a grounded rack of
equipment, the ground to the case may be lifted to prevent multiple
ground paths, which may cause a ground loop to occur.
OPERATION
The main application of the SLA-2 is as a studio linear power amplifier
for powering monitors. Connect source material directly into the inputs
and set the output controls to provide an appropriate level into the next
stage of your system (and an excellent choice for this are the ART
SLM-1 Studio Linear Monitors).
NORMAL OPERATION
For a typical stereo setup, connect the source (mixer, eq, etc.) outputs
into channels one and two of the amplifier. Connect your speakers to
the outputs on the rear of the amplifier. Be sure that your front gain
controls are turned down to their lowest level (full counter-clockwise).
Turn the amp on, then slowly turn the input level up. Use the front gain
controls to regulate the output volume. Be sure not to raise the volume
past the clip level; however, an intermittent clip signal is acceptable.