iA480X 480W installation amplifiers for 100V, 70V and 4 Ω sound systems. Phoenix output connectors, Phoenix input in parallel to stereo RCA and link output connectors, ground lift. 24V DC power supply makes these amplifiers suitable for most demanding and critical applications. Power switch is hided with cover to prevent illegal or incidental use. Fan powered cooling system, rack mount. iA amplifiers are designed to work under hard conditions and required minimum maintenance after installation. Used in a medium and large public address or voice evacuation systems.