Pre-Amp Control Frequency 150Hz, 400Hz, 2.5KHz, 15KHz - Sub-Woofer Crossover Frequency 30Hz ~ 250Hz - DC to DC Switching Power Supply - Sub-Woofer Output Level Control - Input Selector For Radio/CD - With Individual Input Level Control - Fader Control - 2 Gold Plated RCA for Sub-Woofer Pre-Amp Output - 4 Gold Plated RCA for Radio & CD Input - Front & Rear Pre-Amp Output - 7V Preamp Line Out - S/N Ratio: 110dB - Dimension: 178x27.5x11.5 mm - Frequency Phase Control 0?~180? - Blue Color Illuminated Controls