Features: ? The power is soft to start ? Bridge/Stereo transfer output ? Can switch 150Hz low frequency output, ? Protection functions: Over-flow, over-heat, over-load, and short-circuit ? High Performance DC Fans ? High Efficiency And Low Emission , Toroidal Transformer Specifications: Model CA2 CA4 CA6 CA9 CA12 CA18 8? Stereo Power 150W 250W 400W 520W 800W 1200W 4? Stereo Power 225W 375W 600W 780W 1200W 1800W 8?Bridge Power 450W 750W 1200W 1560W 2400W 3600W Freq.Resp(+0/0.31W/8? 20Hz-20KHz, -z-20KHz(+0/0.5dB) THD+N <0.03% <0.03% <0.03% <0.03% <0.03% <0.03% Slew Ratio 20V/us 20V/us 30V/us 30V/us 40V/us 44V/us Damping Factor 400 400 400 400 300 300 S/N Ratio >90dB >90dB >95dB >95dB >95dB >95dB Input Sensitivity 0.775V,1V,1.4V Input Imped.(bal./unbal.) 20K?/10K? Protection: Overheat, Short circuit, DC, limit and soft-start, Output Rely Zero Current Switch, Intellectual Clip Limiter Crosstalk >70dB >70dB >70dB >70dB >70dB >70dB Gross Weight 21.25KG 23.75KG 25KG 27KG 44KG 47KG Dimensions(CM) L59*w57*h15 L65*W58.5*H22