Operating Manual - SRA-120 Power Amplifier
8.2Stereo Playback Monitoring System
Here the SRA-120 is fed from a low line-level (-10dBu) stereo tape machine or CD player. Only the sensitiv- ity switch should be depressed.
8.3Mono Operation in High Level Bi-Amped System
Here the SRA-120 is fed from the high frequency output of a professional two-way crossover. The stereo/ mono and normal/bridged switches are both depressed to obtain the maximum amount of power when amplifying a mono signal. In this mode, the channel 1 input feeds both sides of the amp, but the phase of channel 1 is inverted so the voltage difference between the channel 2 and channel 1 red binding posts is twice as great as either would be relative to the black binding posts. The (+) in-phase speaker connection is then made to the channel 2 red binding post and the (-) out of phase speaker connection is made to the channel 1 red binding post. (Warning: the output power available to the horn or loudspeaker is doubled when in bridged/mono mode. Some horn drivers may be damaged by excessive power.)
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