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The frequencies below the crossover point will be attenuated at 12dB/octave. Permits adjustment of the crossover frequency ,by rotating the knob to select any frequency between 80Hz to 1.2kHz & 50Hz to 500Hz as the crossover point. 2.Set to the "L.P.F" position when the amplifier is used to drive a subwoofer. The frequencies above the crossover point will be attenuated at 12dB /octave. Permits adjustment of the crossover frequency, by rotating the knob to select any frequency between 50Hz to 250