10
Operation Modes
For stereo (dual channel) operation, turn the amplifier off and set the mode select switches on the back panel to
the OUT (e
xtended) position. In this mode, both channels operate independently of each other with their input
attenuators controlling their respective levels. For example, a signal at channel A’s input produces an amplified
signal at channel A’s output, while a signal at channel B’s input produces an amplified signal at channel B’s out-
put.
Stereo Operation
Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use
e
xtreme caution when operating in bridged mode; potentially lethal voltage may be present at the output termi-
nals. To bridge the amplifier, depress the rear panel Bridge Mode switch (17) to the IN position. Direct the signal to
channel A’s input and connect the speakers across pin +1 and pin +2 of the channel A Speakon® output connector.
Only channel A’s input attenuator is active while in Bridged Mono mode.
Bridged Operation
Unlike the Stereo Mode, in which one side of each output is at ground, in the Bridged Mode
both sides ar
e hot. Pin +1 is Channel A’s side, which is the same polarity as the input. The
minimum nominal load impedance in the Bridge Mode is 4 Ohms, which is equivalent to
driving both channels at 2 Ohms. Driving bridged loads of less than 4 Ohms will activate
GCL circuitry, resulting in a loss of power and potential thermal overload.
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