Bogen's M-Class delivers on what professional sound installers need most Flexibility, Power, and Reliability. Flexibility 3 modes of operation: Stereo, 70V Mono, or Dual Mono; and 2 modular input bays for a variety of prioritized input types. Power up to 600W/ch stereo or 1200W of 70V mono power. Reliability Massive power toroid and heat sinks; heavy 14-gauge chassis; patented Back-Slope AC voltage stabilization; Clip limiters, DC voltage, over-current, and thermal protection circuits. 1200W mono power level for 70V speaker systems 600W stereo power level per channel @ 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 module capacity) Professional, dual-channel (balanced or unbalanced), high-impedance input module with gain selection included 3 selectable low-frequency, roll-off choices 2x1 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 indicators 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 (3-1/2") 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 to UL Standard 60065 for US and Canada