Marathon DJ-5000 DJ Series Amplifier 700@8 Ohms - 1400@4 Ohms - Up To 5000@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 15 x 4.25 Inch / W: 16 lbs.