Class I four-channel PA power amplifier with an integrated switch-mode power supply. It provides 2,500 W RMS per channel at 2 ohms, 2,100 W at 4 ohms, and 1,300 W at 8 ohms. Stereo, parallel, and bridged operation are selectable. The amplifier has balanced XLR inputs, XLR feed-through outputs, speaker outputs, channel level controls, LED metering, protective circuits, front-to-rear cooling, and a 19-inch 2 U rack chassis.