Crest audio LQ10 SPECIFICATIONS
Specifications
LQTM10 Loudspeaker
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: 201.909.8700 FAX: 201.909.8744
www.crestaudio.com
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
8/21/01
v.1.5
Architects’ & Engineers’ Specifications:
The loudspeaker system shall have an operating bandwidth of 74 Hz to 18 kHz.The nominal output level shall be 96.0 dB when measured at a
distance of one meter with an input of one Watt.The nominal impedance shall be 8.0 Ohms. The maximum continuous power handling shall
be 250 Watts, maximum program power of 500 Watts and a peak power input of at least 1,000 Watts, with a minimum amplifier headroom of
3 dB.The nominal radiation geometry shall be 90 degrees in the horizontal plane and 40 degrees in the vertical plane.The outside dimensions
shall be 18.75 inches high by 14.00 inches wide by 13.19 inches deep.The weight shall be 31 pounds.The loudspeaker system shall be a Crest
model LQ 10.
frequency response
usable low frequency limit (-10 dB point)
power handling
sound pressure level
maximum sound pressure level (1 meter)
radiation angle measured
transducer complement
box tuning frequency
crossover frequency (internal passive)
time offset
impedance (Z)
input connections
enclosure materials and finish
mounting provisions
dimensions (H x W x D)
net weight
74 Hz to 18 kHz ±3 dB
57 Hz
Full Range 250 W continuous 500 W program
Full Range 96.0 dB SPL, (2.83 V input)
Full Range 120.0 dB SPL continuous 126.0 dB SPL peak
90 degrees horizontal x 40 degrees vertical
Low Freq 1x 10" woofer, vented long throw heavy-duty woofer
High Freq 1x 1" exit/34 mm voice coil compression driver HF™ 1 on a CD horn
Fbox 75 Hz
Low Freq 2,200 Hz
Low Freq 0.00 ms
High Freq Horn spatially aligned
Full Range Nominal 8.0Ω Minimum - 6.7Ω
2x Neutrik
®
Speakon®for full-range inputs
Dark gray high impact polypropylene 1/4" thick finished in textured molded surface
(8) 1/4" threaded mounting points, four each top and bottom
front 18.75" x 14.00" x 13.19" 476 mm x 356 mm x 335 mm
rear 16.69" x 8.00" x 13.19" 424 mm x 203 mm x 335 mm
31 lbs. (14.1 kg)
LQ10 Loudspeaker
Full Range
Other LQ series loudspeakers
SERIES
Features
Description
• Quadratic Throat Geometry horn
• 500 W program, 1000 W peak
• 10" long throw heavy-duty woofer
• Crest HF
TM
1 one and a quarter inch titanium compression driver
• DPS (Dynamic Protection System) tweeter protection
• High power crossover components
• Top and bottom flying point inserts
• Multiple handles and 1-3/8" stand mount
• Available in white
The Crest LQ 10 is an injection-molded two-way speaker system,
engineered in the Crest tradition to provide superior performance
from a compact and durable package.The enclosure is made from
very high impact injection-molded polypropylene in a trapezoidal
shape, with extensive ribbing and bracing.The grille is comprised of
perforated metal protected by a high quality vinyl coating process.
The two-way system is comprised of a 10" long throw heavy-duty
woofer, and a water-resistant treated cone and dust cap for superior
environmental stability. The high frequencies are handled by a Crest
HF
TM
1 one and a quarter inch titanium diaphragm compression driver, coupled to a 1" Quadratic Throat Geometry horn, molded integral
to the cabinet. This horn provides outstanding dispersion coupled
with a well-controlled pattern, and a smooth, even response.Utilizing
Quadratic Throat Horn
TM
technology, under US Patent 6,059,069, the
horn has lower distortion than many popular CD horn geometries.
Input connection to the system is made via two 4-pin Neutrik® jacks
connected in parallel for full-range signal input and daisy chaining
capability
The internal passive crossover features the DPS
TM
(Dynamic
Protection System) tweeter protection circuit, an advanced topology
crossover with high performance components, to provide high power
handling and reliability.The crossover provides driver roll-off and protection, as well as driver EQ for the woofer and horn. High-quality,
reliable crossover components include polypropylene capacitors,
and high current inductors and input connectors. The optimal integration of the crossover with the selected drivers results in a smooth
frequency response from 74 Hz to 18 kHz.
LQTM10
Loudspeaker
LQ10
LQ12
LQ15
250W
500W
500W
1,000W
2,000W
2,000W
Power Handling Continuous Peak
*80304799*
Specifications
LQTM10 Loudspeaker
Power Handling
There are many different approaches to
power handling ratings. Crest rates this
loudspeaker system’s power handling
using a full-range form of the AES
Standard 2-1984. Using audio band 20
Hz to 20 kHz pink noise with peaks of four
times the RMS level, this strenuous test
signal assures the user that every portion
of this system can withstand today’s high
technology music.This rating is contingent
upon having a minimum of 3 dB of amplifier headroom available.
Frequency Response
This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency
response of the Crest LQ 10 is measured
at a distance of 1-meter using a 1-Watt
(into the nominal impedance) swept-sine
input signal. As shown in figure 1, the
selected drivers in the Crest LQ 10 combine to give a smooth frequency response
from 74 Hz to 18 kHz.
Directivity
Beamwidth is derived from the -6 dB
points from the polar plots (see figure 3)
which are measured in a whole space
anechoic environment. Q and Directivity
Index are plotted for the on-axis measurement position. These are specifications
that provide a reference to the coverage
characteristics of the unit. These parameters provide insight for proper placement
and installation in the chosen environment. The blending of the components of
the Crest LQ 10 exhibit a desirable
beamwidth and directivity (figure 3 and 4)
suitable for sound reinforcement applications.
Specifications
LQTM10 Loudspeaker
125 Hertz
250 Hertz
500 Hertz
1000 Hertz
2000 Hertz
4000 Hertz
8000 Hertz
16000 Hertz
125 Hertz
250 Hertz
500 Hertz
1000 Hertz
2000 Hertz
4000 Hertz
8000 Hertz
16000 Hertz
Horizontal Polars
Vertical Polars
Amplitude R esponse (1W 1m O n-Axis)
110
100
90
80
dB SPL (re20 Pa)
70
60
20 50 100 200 500 1k 2k 5k 10k 20k
Figure1
Frequency (Hz)
Im pedance
100
50
30
20
Z
(
)
10
5
3
2
1
20 50 100 200 500 1k 2k 5k 10k 20k
Figure2
Frequency (Hz)
B eam w idth
360
300
180
140
100
80
60
40
B eam w idth(Degrees)
30
Horizontal
Vertical
20 50 100 200 500 1k 2k 5k 10k 20k
Figure3
Frequency (Hz)
Q&DirectivityIndex
100
Q
10
10
20
Di
o
0
o
30
o
60
o
90
o
-30
o
0
o
30
o
60
o
90
o
-30
o
90
-90
90
o
60
o
-60
o
o
o
60
o
0
o
30
o
o
-60
60
o
o
90
-90
o
-30
o
-60
o
-90
30
o
60
o
90
o
0
o
30
o
o
-60
60
o
o
90
-90
o
-30
o
-60
o
-90
30
o
60
o
90
o
90
o
30
o
0
o
-30
-90
o
60
o
30
o
0
o
-30
o
-60
o
o
90
o
30
o
0
o
60
o
30
o
0
o
0
o
o
0
o
o
90
o
-90
o
90
o
0
o
-30
o
-60
o
90
-90
o
30
o
60
o
o
-30
o
-60
o
-90
o
0
o
-30
o
-60
o
90
-90
o
30
o
60
o
o
-30
o
-60
o
-90
o
o
60
o
30
o
0
o
-30
o
-60
90
-90
o
60
o
30
o
0
o
-30
o
-60
o
o
o
60
o
30
o
0
90
o
60
o
30
o
0
1
20 50 100 200 500 1k 2k 5k 10k 20k
Figure4
Frequency (Hz)
o
-30
o
-60
o
0
-90
o
-90
o
-30
o
-60
o
-90
o
-30
o
-60
o
-90
o
-30
o
-60
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