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"LPF": Slide switch to this position if the amplifier is used as a subwoofer amplifier. 2. HIGH-PASS/LOW-PASS FREQUENCY SELECTOR KNOB (FREQ) Adjust high/low-pass crossover frequency between 30 to 300Hz. 3. BASS BOOST CONTROL (BOOST) Select a boost level between 0dB and +18dB to enhance the bass performance of your sound system. 4. INPUT SENSITIVITY LEVEL CONTROL (SENS) The input sensitivity level can be varied from 5.0 volts to 100 mV depending on the output voltage of the source unit (refer to