operation modes 4
stereo
For stereo (dual channel) operation, turn the amplifier off and set the mode select switch to the stereo position. In this mode, both channels operate independently of each other, with their input attenuators controlling their respective levels. Thus, 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 output.
parallel
For parallel
bridged mono
Both amplifier channels can be bridged together to make a very powerful
Unlike the stereo and parallel modes, in which one side of each output is at ground, in the bridged mode both sides are hot. Channel A’s side is the same polarity as the input.The minimum nominal load impedance in the bridged mode is 4 ohms which is equivalent to driving both channels at 2 ohms. Driving bridged loads of less than 4 ohms will activate the ACL circuitry resulting in a loss of power, and may also cause a thermal overload.
When operating in the bridged mode, both attenuators must be in the same position so the speaker load will be equally shared between the channels.
a
p.9