... amplifiers are class D amplifier of digital signal transmission. With four separate amplifier in a single chassis ... circuit , high temp and overload.Indications for power, signal, peak, and protectionExcellent device of radiator cooling fanner ... 1/3 rated powerControlsPower switch, volume controlIndicatorsPower, clip , signal, protectProtectionAC fuse, short-circuit, clip and high tempPower Supply ...