American Audio PXW 18P powered subwoofer This 18" powered subwoofer from American DJ provides plenty of bass without too much vibration. It offers balanced full ranged XLR input, High Pass XLR output, as well as a thru full range output to reduce external noise. A gain control knob regulates the output level of the subwoofer to set a balance between the speakers and subwoofer. LED indicators signal when power is on, when the built-in limiter is active, or when the subwoofer is in protect mode to prevent overheating and loss of output. A signal LED indicator also lights up when a signal is received to full range input. The PXW 18 P 18 inch powered subwoofer also rounds out its features with a phase switch for reversing polarity. Combine these features with 800 watts of maximum power, level controls, heavy duty caster wheels, a cooling fan, and the benefit of using the American DJ PXW 18 P as a portable unit or permanent installation, and the value of this subwoofer speaks for itself.