1.Removable front panel, easy to clean and maintain. 2.Adopt Air flow from front to rear cooling Audio amplifier line. Model 50D Power8 ohm stereo* 4*450W4 ohm stereo* 4*800W2 ohm stereo** 8 ohm bridge* 2*1600W4 ohm bridge** Other SpecificationFrequency response 20Hz-20KHz+0/-0.5dBTHD+N <0.05%(1kHz,1/8 output power)S/N rate -100dBDamping factor >200@8 ohmCrosstalk >70dBInput sensitivity 0.775v/1. ...