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CH3/CH4 Crossover Mode Selector:
when used with normal, full range systems, set this switch to "FULL." If you wish to use the internal crossover to power a driver of specific frequency range, use the "LOWPASS" or "HIGHPASS" settings.
CH5/CH6 Low Pass Frequency Control:
when the crossover selector switch is in "low pass" mode, this control sets the upper frequency limit for audio program sent to the speakers.