Chassis capable of housing up to four power modules of the F2 and F2DC series that allows configuring of 1, 2, 3 or 4 channel power amplifiers, with power per channel from 60 W to 460 W (on 100 V line), perfectly adapted to the needs of the work. The ease of selecting the power modules that best suit the loudspeakers in the installation and the high efficiency of class D minimize electrical energy consumption. Also, in the case of using emergency power supplies (with the F2DC series), the number of batteries required is reduced. As an option, each power module can incorporate a secutity relay for messages and program and priority inputs with automatic switching.