Filter
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3 Filter Selector
This switch allows selection of the frequency filters that permit the amplifier to be used to reproduce the entire
audio range, just the bass, or all frequencies above the bass range.
In the "OFF" position of the switch, the response is flat and unaffected so the entire audio frequency range is
reproduced by the amplifier. Use this setting if the amplifier is being used to power a full range speaker system.
In the "LOW PASS" setting, only the bass frequencies
below the frequency set by the Crossover Frequency
Control will be amplified and fed to the speakers. Use this setting if the amplifier is being used to power
a sub-woofer speaker system.
In the "HI-PASS" setting, only the frequencies
above the frequency set by the Crossover Frequency Control
will be amplified and fed to the speakers. Use this setting if the amplifier is being used to power the full-range
speakers in a system that also has separate sub-woofer(s).
4 Crossover Frequency Control
This Control selects the crossover frequency when the Filter Selector is in the "LOW-PASS" or "HI-PASS"
settings. Adjust it to the appropriate position for the characteristics and crossover frequency requirements of
the speaker system with which the amplifier is being used.
5 Bass Boost Switch
This switch is used to accentuate the bass frequencies by adding +12 dB or +18 dB of boost to the signal
(at 45 Hz.).