Power device with 2 separated and independent 160W amplifiers, each having 2 audio inputs, of which one with priority function through a closing contact. It designed for the transmission of announcements and musical programmes. Both the audio inputs are at line level, for pre-amplified signals or music sources. The amplifier output is available either for low impedance loudspeakers or 100 to70V constant voltage line. The amplifier is class D with switching power supply, the overall weight is extremely reduced plus it offers a wide audio bandwidth quality.