iA4X125 is four channel 4x125 W power installation amplifier for 100V, 70V and 4 Ω sound systems. Switching power supply, phoenix output connector, input gain control, dual or single input mode, output configuration selector, HP filter. iA4X125 is designed without output transformer. Fan powered cooling system, rack mount. iA amplifiers are ready to work under hard conditions and required minimum maintenance after installation. Used in a medium and large public address or voice evacuation systems.