450 Watt Dual-Channel Amplifier 3 mono power levels: 1200W, 900W, or 600W for 70V speaker systems 3 stereo power levels: 600W, 450W, or 300 W per channel at 4 ohms 3 modes of operation to choose from: Stereo, Dual Mono, or 70V Mono Low noise, low distortion, and high slew rate Flexible modular input capability 2 modules capacity Professional, dual-channel balanced or unbalanced, high-impedance input module with gain seletion included 3 selectable low-frequency, roll-off choices 2×1 mixer function when in mono modes Insert connections for outboard equipment in mono modes Post- and Pre-EQ Output Feeds summed mono out in stereo mode DC, overload, short circuit, and thermal protection circuits Clip limiting circuits for speaker protection Power-saving Sleep Mode for intermittent use applications Status, Signal, and Clip/Limit indications Back-Slope AC voltage stabilization for dependable performance over varying AC line voltages Heavy-gauge steel chassis with cast aluminum front panel Recessed volume control knobs with snap-on protective cover Mounts in 2 rack spaces 3-1/2In. directly stackable without need for extra space above or below 2 independent, continuously variable, cooling fans for dependable and quiet operation Easily removable front fan grilles with filters Stable into 2-ohm loads Listed UL Standard 60065 for US and Canada