Power Acoustik PWM-16 Pre-Amp Equalizer 2 selectable balanced inputs & front panel aux input 4 bands 18Db parametric equalizer Independent volume & fader control 1 Db/Octave Pre-Amp Isolated Pwm Power Supply Maximum Output: 8V Subwoofer Crossover Variable: 30-20 Hz S/N Ratio: 10 Db @ 1 (A Weighted)