Crest audio LQ15 SPECIFICATIONS

Specifications	LQTM15 Loudspeaker
	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	90o horizontal X 45o vertical
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
impedance (Z)	Full range nominal 8.0 Ω minimum 6.0 Ω
	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.	be 90 degrees in the horizontal plane
	The maximum continuous power	and 45 degrees in the vertical plane.
The loudspeaker system shall have an	handling shall be 500 watts, maximum	The outside dimensions shall be 28.50
operating bandwidth of 64 Hz to 18 kHz.	program power of 1,000 watts and a	inches high by 21.25 inches wide by
The nominal output level shall be 100 dB	peak power input of at least 2,000 watts,	17.25 inches deep. The weight shall be
when measured at a distance of one	with a minimum amplifier headroom of 3	56 pounds. The loudspeaker system
meter with an input of one watt. The	dB. The nominal radiation geometry shall	shall be a Crest model LQ 15.

Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.

Crest Audio Inc.

8/21/01

16-00 Pollitt Dr. Fair Lawn, NJ 07410 USA

TEL: [phone] FAX: [phone]

v.1.5

www.crestaudio.com

*80304798*

LQTM15

Loudspeaker S E R I E S

Power Handling	Continuous	Peak
Full Range
LQ15	500W	2,000W
Other LQ series loudspeakers
LQ10	250W	1,000W
LQ12	500W	2,000W

Features

•Quadratic Throat Geometry horn

•1000 W program, 2000 W peak

•15" cast frame 4" VC premium woofer

•Crest HFTM2 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

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 continuous power handling (AES Std 2-1984). The high frequencies are handled by a Crest HFTM2 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 topology 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 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.