... 2,Multiple wise protection 3,Excellent timbre 4,Two dual-speed fans switch Professional Power AmplifierDetails:CharacteristicE-2130E-2150 E-2180Out Power ... the speaker system. This function have control by on switch, you can switch on/off to use it or not. It let ... ×1000W, can matching any sound box.5,The two dual-speed fans switch automatically to maintain the proper internal operating temperature The ...