Adjustable input gain volume   Low input / High input push switch   Protection circuit for thermal, SP short, DC reverse, DC offset   Power on led   Protection led   Magnetics core ( Made in USA )   1CH, 2CH, 3CH, 4CH - High pass variable crossover (40Hz~240Hz) 12dB/OCT   5CH, 6CH - Low pass variable crossover (40Hz~240Hz) 12dB/OCT - Sub sonic variable crossover (15Hz~30Hz) 12dB/OCT - Bass boost volume at 45Hz ( 0~18dB ) - Remocon       Frequency Response 5Hz~45KHz RMS power at 4 OHM Stereo 70W x 4CH + 110W x 2CH RMS power at 2 OHM Stereo 100W x 4CH + 170W x 2CH Max Power 1250W T.H.D 0.05% Input Sensitivity 200mV~4V Input Impedance 10K ohms Damping Factor >200 S/N Ratio 100dB Channel Separation 60dB