Marathon Dj-3000 Dj Series Power Amplifier 350@W8 Ohms - 700w@4 Oohms - Up To 3000w@8ohm Bridge Input Impedance Balance: 20K ohms Non-Balance 10K ohms Frequency Response: +0, -0.2 dB, 20Hz to 20KHz / Frequency: 60/60 Hz Input Level +4dB / Input Voltage: 115/230V AC Dimensions: 19 x 13 x 4 Inch / W: 14 lbs.