crest performance LQ15 LOUDSPEAKER Specifications

Specifications
LQ15 Loudspeaker
frequency 64 Hz to 18 kHz (±3 dB)
usable low frequency limit (-10 dB point) 48 Hz
power handling Full range 500 W continuous 1,000 W program
High freq 60 W continuous 120 W program
sound pressure level Full range 100 dB SPL, (2.83 V input)
High freq 110 dB SPL, (2.83 V input)
maximum sound pressure level (1 meter) Full range 126 dB SPL continuous 134 dB SPL peak
High freq 128 dB SPL continuous 134 dB SPL peak
radiation angle measured 90 o horizontal X 45
transducer complement Low freq 1x 15" woofer, vented
High freq 0.875 in. exit/51 mm voice Coil HF™2 compression driver on a CD horn
box tuning frequency Fbox 58 Hz
crossover frequency (internal passive) Low freq High freq 1600 Hz
recommended minimum active crossover Low freq High freq 1600 Hz at 12 dB/octave
time offset Low freq 0.00 ms High freq 0.00 ms horn spatially aligned
Full range nominal 8.0 Ω minimum 6.0 Ω
impedance (Z)
High freq nominal 8.0 Ω minimum 5.4 Ω
input connections 2x 1/4" phone jacks paralleled with
2x Neutrik® NL4 Speakon® for full range inputs.
1x Neutrik NL4S switching Speakon for bi-amp inputs.
enclosure materials and finish Dark gray high-impact polypropylene 1/4" thick finished in molded textured finish
mounting provisions (8) 1/4"-20 threaded mounting points, 4 each top and bottom
dimensions (H x W x D) Front 28.50 in. x 21.25 in. x 17.25 in. 724 mm x 540 mm x 438mm
Rear 26.75 in. x 11.63 in. x 17.25 in. 679 mm x 295 mm x 438 mm
net weight 56 lbs. (25.5 kg)
Architects' & Engineers' Specifications: nominal impedance shall be 8.0 ohms.
The maximum continuous power
The loudspeaker system shall have an handling shall be 500 watts, maximum
operating bandwidth of 64 Hz to 18 kHz. program power of 1,000 watts and a
The nominal output level shall be 100 dB peak power input of at least 2,000 watts,
when measured at a distance of one with a minimum amplifier headroom of 3
meter with an input of one watt. The dB. The nominal radiation geometry shall
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.
8/21/01
v.1.5
LQ TM 15 Loudspeaker
o vertical
be 90 degrees in the horizontal plane
and 45 degrees in the vertical plane.
The outside dimensions shall be 28.50
inches high by 21.25 inches wide by
17.25 inches deep. The weight shall be
56 pounds. The loudspeaker system
shall be a Crest model LQ 15.
Crest Audio Inc.
16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA
TEL: 201.909.8700 FAX: 201.909.8744
www.crestaudio.com
*80304798*
Power Handling
Full Range
LQ15
Other LQ series loudspeakers
LQ10
LQ12
Features
• Quadratic Throat Geometry horn
• 1000 W program, 2000 W peak
• 15" cast frame 4" VC premium woofer
• Crest HF TM 2 two-inch titanium compression driver
• DPS™ (Dynamic Protection System) tweeter protection
• Crossover EQ switch
• High power crossover components
• Top and bottom flying point inserts
• Multiple handles and 1-3/8" stand mount
• Available in White
LQ 15
TM
Loudspeaker
S E R I E S
Continuous
500W 2,000W
1,000W
250W
2,000W
500W
Description
The Crest LQ 15 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 15" cast frame premium
woofer with a 4" voice coil and a water-resistant treated cone and dust
cap for superior environmental stability. Capable of over 500 W of con-
tinuous power handling (AES Std 2-1984). The high frequencies are
handled by a Crest HF TM 2 two-inch titanium diaphragm compression
driver utilizing ferrofluid, coupled to a 1" Quadratic Throat Geometry
horn, integral molded to the cabinet. This horn provides outstanding
dispersion coupled with a well-controlled pattern and a smooth, even
response. Utilizing Quadratic Throat Horn™ technolog (US Patent
6,059,069) the horn has lower distortion than many popular CD horn
geometries. The Crest HF 2 driver utilizes the Radialinear Planar
Phase Correction System (US Patent 6,064,745) which provides
smoother and extended high frequency response.
Input connection to the system is made via two 1/4" phone jacks, and
two 4-pin Neutrik® jacks all connected in parallel are provided for signal
input and daisy chaining capability, while a 4-pin Neutrik switching jack
is provided for bi-amping flexibility while maintaining signal integrity.
The internal passive crossover features the DPS™ (Dynamic
Protection System) tweeter protection circuit, and an advanced topol-
ogy with high performance components, to provide high power han-
dling and reliability. The crossover provides driver roll-off and protec-
tion, as well as driver EQ for the woofer and horn. High-quality, reli-
able crossover components include polypropylene capacitors, and
extremely high current inductors and input connectors. The optimal
integration of the crossover with the selected drivers results in a
smooth frequency response from 64 Hz to 18 kHz. An EQ contour
switch is provided enabling the user to select one of two EQ settings.
One setting will yield a nominally flat frequency response, the other
reduces the upper mid range frequencies which can help in keeping
bright rooms from overloading, or to help achieve a mellower voicing
for those applications that prefer it, such as DJ use.
Peak