3 modes of operation: Stereo (4-ohm) Dual Mono (4-ohm) or 70V Mono 3 mono power levels: 600W 900W or 1200W for 70V speaker systems 3 stereo power levels: 300W 450W or 600W per channel @ 4 ohms2 x 1 mixer function in mono modes 2 Module input bays for flexible modular input capability