4.
Spaceframe?
A rigid aluminum outer structure
that distributes lifting stress along the entire sides,
enabling pull tests of up to 25,000 Ibs. with no failure or
structural deformation...impossible with traditional
wooden enclosures.
5. Linear Dynamics Aperture?
Contoured
subwoofer ports that virtually eliminate high-level
turbulence found in traditional subwoofers...giving an
8dB improvement at full output over standard ports. The
overall subwoofer system provides 3dB areater outout
than conventional subwoofers. meaning only one half
the number are required for equivalent acoustical
output when compared to conventional units.
ANY ONE OF THESE TECHNICAL ADVANTAGES
WOULD GIVE A SOUND SYSTEM A
_ _COMPETlTlVE EDGE. HLA COMBINES THEM
ALL.
POWER RECblMENDATIONS: HIGH
OUTPUT = FEWER AMPLIFIERS
Due to its high electrical-to-acoustical power conversion
efficiencies, HLA’s reduced amplifier power needs
further lighten the overall system weight of an HLA-
loaded truck. In fact, a small system of 8 (eight) 4895 3-
way units and 4 (four) 4897 subwoofers can be
powered by as few as 5 (five) high-powered
professional dual-channel power amplifiers. This is
nearly one-half the number of amplifiers required by
some competitive, traditional loudspeaker systems to
achieve the same acoustical output.
The result? Fewer speaker units and fewer amplifier
racks required for a given SPL (Sound Pressure Level),
resulting in a lower overall truck axle weight. For
example:
astern Weight 8~ Amplifier Reauirements,
Ecal
Total # of enclosures- (8) 4895 3-way, (4) 4897 subs
Total power amplifiers-
(5 dual-channel
power amplifiers)
Total speaker weight- (2,880 Ibs.)
*Suggested power levels: HF (High Frequency), 150-200 watts
MF (Mid Frequency), 300-500 watts
LF (Low Frequency), 500-700 watts
Subwoofer, 600-l ,000 watts
4
SPEAKER UNIT SIZE
The HLA enclosures are engineered for the highest
possible audio performance and maximum acoustical
advantage. To provide this, the high-output waveguides
require specific path lengths and horn mouth areas.
This includes a design goal of true, controlled-coverage
response to 100H.z in the Model 4897 3-way system.
This characteristic eliminates the traditional “hole” in the
frequency response between the mid/high box and the
subwoofer found in many other systems. The
subwoofer requires the same shape and size so that it
can be suspended together as part of the array if
desired, and to provide the required internal working
volume and port area for high output levels.
Clearance is provided within the Spaceframe to
accomodate directional tilting of this aimable
waveguide in the Model 4895 3-way unit. It has an
engineered tilt angle of 15 degrees. This can be used to
direct sound
up
or down depending on the cabinet’s
orientation. This provides optimum coverage with
minimum overlap, dramatically improving speaker
system intelligibility. It also sets the physical size of the
frame.
..J
POWER AMPLIFIER SUGGESTIONS, TYPICAL
The 4895 3-way unit uses 16-ohm transducers, allowing four transducers in each bandpass to be driven in parallel.
The 4897 Subwoofer uses two 8-ohm transducers.
Figure 1
Bandpass
JBL
crest Crown
QSC
HF
600: 150W/ch., S 7001:
2OOW/ch., S 2400:
2OOW/ch., S 1.8: lGOW/ch.,
S
MF
1200: 300W/ch., S 9001:
500W/ch., S 3600:
4OOW/ch., S 4.0: 400W/ch.,
S
LF
1200: 8OOW/ch., B 9001:
500W/ch., S 5000:
5OOW/ch., S 3.4: 850W/ch.,
B
/-
SUB
750: lOOOW/ch., B 9001:
llOOW/ch., S 3600:
800W/ch., S 4.0: 800W/ch.,
S
Notes: ‘s’ = stereo mode. ‘B’ = bridged mode.
&
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