High pass variable crossover (40Hz~240Hz at 12dB/OCT -1,2,3,4CH)   Low pass variable crossover (40Hz~240Hz at 12dB/OCT -1,2,3,4CH)   Full range switch for 1,2,3,4CH   Bass boost control 0-18dB at 45Hz   Power on led   Protection indicator led   Sub sonic filter 15~30Hz   Sub sonic functions ON - OFF   Gain volume Min - Max   Protection circuit for thermal, overload, DC reverse, DC offset   Remocon for subwoofer       Frequency Response 5Hz~45KHz RMS power at 4 OHM Stereo 60W x 4CH RMS power at 4 OHM Mono 170W x 2CH RMS power at 2 OHM Stereo 90W x 4CH Max Power 600W T.H.D 0.05% Input Sensitivity 200mV~4V Input Impedance 10K ohms Damping Factor >200 S/N Ratio 100dB Channel Separation 60dB