The LSR2310SP Powered Studio Subwoofer is based on a 10" long excursion woofer and a 180 watt power amplifier. Added to a stereo system, it extends the low frequency response of the system below 30Hz. In a surround sound system the sub provides stunning reproduction of the LFE (low frequency effects) channel. The LSR2310SP is packed with professional features including two sets of balanced XLR, 1/4" and unbalanced RCA input connectors, selectable crossover settings and two sets of balanced outputs to allow connection of Left and Right main speakers. A detented level control allows independent adjustment of the subwoofer output to balance the subwoofer in the system.