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JBL Tour Sound Systems
HLA Series: System Use Guidelines
HLA SYSTEM COMPARISONS
A wide variety of professional loudspeaker systems are
available in today' s market. They rely on different
technologies, and come in many different sizes and
shapes. When any new product iike HLA from JBL
Professional
is introduced,
it is natural to seek
comparisons to existing, familiar units.
JBL Professional' s HlA (Horn Loaded Array) system
represents
an
entirely
new
class
of
sound
reinforcement device. As such it does not readily
compare to many alternative boxed speaker systems
from competitive manufacturers. HlA' s high acoustical
power output
capabilities
and pattern-controlled
coverage characteristics allow fewer units to achieve
superior results. Without the benefit of hands-on
demonstrations and a working knowledge of HLA' s
performance as a system, one may initially draw
misleading conclusions when comparisons are made to
alternative systems.
This document is intended to offer objective technical
data that will assist you in understanding the new
technologies
behind HLA, and to address some
practical field-use applications such as power-amplifier
selection, and packing the system in trucks and
containers.
SYSTEM WEIGHT SAVINGS
The Model 4895 3-way unit and the Model 4897
subwoofer unit weigh significantly less than competitive
L
devices of the same general class, while offering
significantly higher acoustical output power. This chart
compares the weight of HlA units to the following
devices from other respected manufacturers:
Primary 3-Way Unit
JBL HLA 4895
EAW KF-852
EN MT-4
Subwoofer Unit
JBL HlA 4897
EAW BH-852
EN MT-4B
NEW TECHNOLOGIES
Weight
230 Ibs. (104.5 kg)
268 Ibs. (121.8 kg)
354 Ibs. (165 kg)
Weight
240 Ibs. (109 kg)
248 Ibs. (112.7 kg)
263 Ibs. (119 kg)
HlA Series loudspeaker systems use a suite of JBL-
developed technologies that are not just unique within
JBL product lines, but to sound reinforcement systems
from any manufacturer. These include:
1. DGD (Dual Coil Drive) speaker components: New
voice coil and motor assemblies have twice the thermal
surface area of traditional speakers, giving higher peak
output with less power compression,
better heat
dissipation, and a flatter impedance curve at high
frequencies. All this in a package one-third the weight of
a traditional speaker, with 16-ohm impedance ratings
enabling more efficient use of high-powered amplifiers.
2. Composite Magazine: A non-wood speaker
enclosure unit made of space-age material gives
imoroved riaiditv and direct cooling plus liahter overall
system weights.
3. MultiBand Waveguide?
A triple-section horn
combining low, midrange and high frequency devices in
a single package with carefully engineered waveguides
(precision acoustical pattern-control devices) offering
wideband controlled coverage with low distortion
characteristics. The bottom line: controlled dispersion,
less interference with adjacent devices in an array, and
better sound.
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