The IA-250 is a family of two input pre-amplifier/mixer or amplifier/mixers designed for mounting into a 4-gang deep masonary box, such as the RACO 698, the BOWERS 4-MB, or equivalent. The two inputs are both switchable between balanced Lo-Z microphone level and compact size balanced line level, allowing for simultaneous connection of up to four input sources. Their in-wall chassis’ are made of rugged .063” aluminum coated with an off-white epoxy based paint, and their faceplates consist of a tough polycarbonate overlay.