Legacy LXR1 Electronic Subwoofer Crossover Network Adjustable Crossover Frequencies of 50,90 & 180Hz Let You Fine Tune Your System Crossover Slope: 12dB/Octave Selectable 45/80120Hz Subwoofer Bass Boost 1 Pair of RCA Output Jacks 1 Pair of RCA Input Jacks & 2 Pair of Aux Inputs