Taking care of the low end is the Resolv120a powered subwoofer. A powerful 120 watt low frequency amplifier drives a heavy-duty 10″ transducer, reproducing tones between 40-180 Hz. The unit has a built-in active crossover, a phase switch, an auto sleep mode and a convenient mute switch jack allowing the user to easily switch on and off the subwoofer on the fly.