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for the subwoofer channel, sot that the subwoofer(s) can run on a separate amplifier or separate channels Fader Action: 3. Use this rotary knob to blend more of a multi-channel amplifier. action into either the Front or Rear channels of yoursystem. The crossover is adjustable from 35Hz to 100Hz. Depending on the subwoofer frequency response 4-Band Rotary Controls: 4. Gives you control of the adjust this knob to the most desired setting. higher musical frequency ranges that most head units cannot