Features: ? Do Not Need Output Relay ? Light Weigh , High Power Density. ? High Efficiency And Low Emission , Toroidal Transformer ? High Damping Factor ? 2 Steps Class H Linear Output Circuit ? High Performance DC Fans ? High power density, 3U rack, very high damping factor and the very tighter sound. ? Output power from 800W to 1200W into 8ohm both channels. Specifications: Model Items MFI-800 MFI-1000 MFI-1200 Freq. Response (At 1 Watt) 20Hz~20KHz,+/-0.5dB S/N Ratio, Unweighted 92dB 92dB 92dB THD (At Half Rated Power) 0.06% Damping Factor (8 ohm) 20-400Hz: ?1600 Crosstalk (Below -3dB Rated Power?20-1KHz) 20Hz-1KHz 79dB Gain (at max. Level setting, 0.775V, +/-5%) 42.0dB 41.2dB 40.3dB Slew Rate (Below -3dB Rated Power,1KHz) 20V/uS Power Output 8 ohm Dual (Per Channel) 1200W 1000W 800W 4 ohm Dual (Per Channel) 1800W 1500W 1200W 2 ohm Dual (Per Channel) 2430W 2020W 1620W 8 ohm Bridge 3600W 3000W 2400W 4 ohm Bridge 4860W 4040W 3240W Required AC Mains 110,220,240Vac 50~60Hz Dissipation Power At Idle ?69W Controls Power On-Off, On Front Panel Level -80dB~0dB, On Front Panel Mode Stereo-Parallel-Bridge, On Rear Panel Sensitivity 0.775V, 1.0V, 1.4V, On Rear Panel Low Cut 30Hz, On Rear Panel Low pass NO