16 GROUND/LIFT switch
In normal operation signal source and power amplifier should share the same
ground potential. In some constellations this admittedly leads to ground loops and
thus to humming. If this happens vary the toggle switch setting for ground poten‐
tial on the rear panel of the unit. This switch connects in one setting the shield/
ground of the input signal with the housing of the power amp and thus with mains
earthing. In the other setting there is no electrical connection between the shield/
ground of the input signal and the power amp housing.
17 STE / PAR / BR
Use this switch to select the operating mode of the power amp: stereo (STE), par‐
allel (PAR) or bridged (BR).
18 CH-2
Connect the line-level signals to be amplified to the 1/4" balanced TRS phone jack
input of Channel 2 using a 1/4" phone jack cable.
19 CH-2
Connect the line-level signals to be amplified to the XLR input of Channel 2 using a
XLR cable.
Connections and controls
S-75 • S-100 • S-150
19
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