EMB Pro PA8400 Rack Mount Professional DJ Power Amplifier 4200W PA Band Club For HOME DJ KARAOKE ENTERTAINMENT Max Peak power: 4200 Watts Unit size: 18.9x3.54x11.42 inches Output Circuitry: Class A/B Input: XLR,  (6.35mm), Output: Speak on, Banana binding post Front Controls: AC switch, Ch.1 and Ch.2 Gain Knobs