The EPAK2500 is a four-way, active control and amplification unit specifically designed for the ES Series modular loudspeaker system. It not only houses all signal processing and four individual amplifiers but also controls the allocation of power depending on the number of bass modules employed. The EPAK2500 is enclosed in a road-rugged case with side handles and a built in cable storage compartment. Easily transported on a trolley this unique amplification system has its electronics mounted on an independent suspension system that isolates it from the shocks and impacts typically encountered on the road. A large aluminum heat sink provides passive cooling along with two demand-sensitive fans for added reliability.