Marathon Dj-4000 Dj Series Power Amplifier 500@8 Ohms - 1000@4 Ohms - Up To 4000@8ohm Bridge Channel 1 &amp; 2 Level LED Indicator,* Cannon &amp; Input Jack Connector,* Mode Switch, Ground Lift Switch,* Binding Post Outputs,* Power Select 110V-120V or 220V-240V Power Supply, Power Input IEC Power AC,* Fan Grill Two 2 Speed DC Fans.* 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" W x 13" D x 4" H,* Weight: 14 lbs.