BOSS Audio BX35 3 way Pre-Amp Car Electronic Crossover Front / Rear / Sub Input, Front / Rear / Sub Outputs Front High Pass Filter 65 Hz to 4.5 kHz, Rear High Pass Filter 45 Hz to 1.6 kHz Variable Subwoofer Filter 40 Hz  250 Hz, Variable High Pass Filter 45 Hz  5 kHz Crossover Slope 12 dB / Octave, Variable Subwoofer Phase 0  180 Degrees Variable Bass Boost 0  18 dB, Variable Bass Boost Frequency 25 Hz  250 Hz Maximum Input Voltage 4.5 Volts, Maximum Output Voltage 9 Volts, S / N Ratio 95 dB, THD 0.010 Dimensions: Depth 8 x Width 7.4 x Height 1.5 1 Year Warranty