Bosch extends EVAC horn loudspeaker range with new 50-W,
high-level sound pressure model
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
loudspeaker bosch uk 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 355 mm/25 W) are robustly constructed in
corrosion-proof aluminium with a PVC edge profile for
protection against impact damage. With a maximum power
output of 75 W, the LBC 3484/00 employs a
high-efficiency driver that provides excellent sound
reproduction. The loudspeaker is also available as
separate horn and driver to allow a choice of
combinations when installing.
The new loudspeaker has provision for incorporating
circuit boards for Bosch’s Plena loudspeaker bosch uks
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 as a fault
output to the appropriate system control unit. The
Praesideo Multiple Line and Loudspeaker feature enhances
the safety and security of the public address and
emergency sound system by monitoring the correct
functioning of individual loudspeakers and loudspeaker
line branches. Both the Plena and Praesideo features
allow security and emergency staff to immediately
identify malfunctioning loudspeakers or line breaks.
This permits fast corrective action and ensures
increased safety.
Other key features of the LBC 3484/00 include built-in
protection against fire to ensure system integrity by
incorporating a ceramic terminal block with thermal fuse
and heat-resistant wiring. 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).
Maximum quality is maintained through compliance with
IEC 60268-5 Power Handling Capacity (PHC) standards that
require the loudspeaker to operate continuously at rated
power for 100 hours. Moreover, Bosch’s Simulated
Acoustical Feedback Exposure (SAFE) test demonstrates
that the loudspeaker can withstand operation at twice
the rated power for short durations. This ensures
reliability in extreme conditions, extended product life
and reduced incidence of failure or performance
deterioration.
Email:
imcintyre@aga.co.uk
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