You know the AI story. Super reliable, clean uncolored sound, high power output, lightweight, great features and exceptional customer service This two channel 500 watt (at 4 ohm) model has reverb and effects for both channels and also Hpf. Dependable power in a lightweight class D amp. Inputs for each channel accept both XLR and 1/4 inch. Output DI features are very useful. Full range frequency response: 20 hz to 20 Khz. All features work. A few minor scratches but no damaged knobs or connections. 500 watts of clean power at 4 ohms. Handles 2 ohm loads very well and for hours. All four original feet are there and in great condition. Includes AI amp bag with strap. And power cord. $449 shipped conus. PayPal ok.