Description Bosch LBB 1990/00 Plena Voice Alarm Controller Engineered as the central core for public address and emergency voice evacuation systems, the Bosch LBB 1990/00 Plena Voice Alarm Controller provides full system control, audio management, and output routing for commercial and industrial setups. Fully certified to EN 54-16 and compliant with IEC 60849 emergency standards, it features a built-in 240 W power amplifier, 6-zone 100V speaker distribution, an integrated digital message manager, and a front-panel supervised handheld emergency microphone. Designed for critical life-safety infrastructure across shopping complexes, airport terminals, educational institutes, corporate towers, and industrial hubs in Dhaka, Chittagong, and Sylhet, the unit provides 16 priority levels, 12 trigger inputs, continuous line/fault monitoring, a ...