Bosch Security Systems has added a 50 W rated power model to its range of high-efficiency, EVAC-compliant horn loudspeakers. The new model, the LBC 3484/00, is specially designed for use in public address and voice alarm system applications that require a high level of sound pressure, such as industrial sites and sports grounds.
All three speakers in the range (490 mm/50 W, 490 mm/35 W and 355mm/25 W) are constructed in corrosion-resistant aluminium with a PVC edge profile for protection against impact damage. With a maximum power output of 75 W, the speaker employs a high-efficiency driver said to provide excellent sound reproduction. It is also available as a separate horn and driver to allow a choice of combinations when installing.
The unit is able to incorporate circuit boards for the company’s Plena voice alarm systems and Praesideo public address and emergency sound systems. The Plena End of Line (PLN-1EOL) supervision board detects the 20 kHz pilot tone on the loudspeaker lines. If a fault occurs, a signal is sent to the appropriate system control unit. The Praesideo Multiple Line and Loudspeaker feature monitors the correct functioning of individual loudspeakers and loudspeaker line branches.
Other key features include built-in protection against fire, via a ceramic terminal block with thermal fuse and heat-resistant wiring, while a provision for loop-through cabling makes easy and quick connection of multiple speakers possible. The matching transformer has three primary taps that allow selection of power radiation in three dB steps (12.5, 25 and 50 W).
