Marathon Dj-1000 Dj Series Power Amplifier 150w@8 Ohms - 300w@4 Ohms - Up To 1000w@8ohm Bridge Input Impedance Balance: 20K ohms Non-Balance 10K ohms Frequency Response: +0, -0.2 dB, 20Hz to 20KHz / Frequency: 50/60 Hz Input Level +4dB / Input Voltage: 115/230V AC Dimensions: 19 x 13 x 4 Inch / W: 14 lbs.