Bogen Power Vector modular input amplifier series consists of five models,ranging from 35 to 250 watts of power. Each model accepts up to 8 plug-in modules with 4 levels of priority between modules.Two module bays also accept signal-processing output modules. Each input has its own independent volume control and a signal/clip indicator. An 11-segment LED meter indicates output level, while a motorized master volume control allows smooth and accurate operation of the unit's volume control from remote control panels (sold separately).