1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA
Main Number (714) 754-6175 Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079 Customer Service (714) 957-7150 or toll free (USA only) (800) 772-2834
Cinema Loudspeaker Systems User Manual
LF-4315 Low Frequency Loudspeaker
Introduction
The LF-4315 15” (381mm) low frequency enclosure is designed specifically for cinema applications. Meeting cinema requirements for extended low frequency response differentiates the LF-4315 from more conventional “rock-and-roll” woofer systems. The LF-4315 covers the frequency range from 30 Hertz to 500 Hertz, depending upon the high frequency system requirements.
The three custom 400 watt, 15” transducers were developed specifically for cinema use. They feature 4” (100mm) voice coils, 120 oz.(3.4kg) ceramic magnets, and multi-vented pole pieces to ensure cool operation. Cooler temperatures increase transducer lifespan and decrease power compression at high power levels. Undercut pole pieces ensure the voice coils operate in symmetrical magnetic gaps, reducing second order harmonic distortion. The suspension and voice coils of the transducers have been designed to provide low distortion and high impact bass at high power.
The enclosure is constructed of high quality medium density fiberboard panels with stiffening braces on all panels. Both internal and external port openings are fully radiused ensuring smooth air flow at higher power levels, preventing audible port turbulence.
Bass ports are symmetrically spaced on each side of the transducers, making internal pressure more uniform across the back surface of the transducers. This prevents the cones from being displaced to one side or another by unbalanced forces, reducing the chance of driving the voice coils out of the center of the gaps at high power.
Three T-nuts in the top of the enclosure provide easy mounting of QSC’s HF-75 high frequency system, or MH-1075 mid-high system.
Enclosure is not designed to be suspended, flown, or rigged. Do not suspend, fly, or rig this enclosure.
This product is capable of producing sound pressure levels that can permanently damage human hearing. Always keep sound pressure levels in the listening area below levels that can damage human hearing.
Install in accordance with QSC Audio Product’s instructions and a licensed, professional engineer. Only use attachments, mounts, accessories, or brackets specified by QSC Audio Products, Inc. Refer all servicing to qualified personnel. Servicing is required when the apparatus has been damaged in any way.
WARNING! Before placing, installing, rigging, or suspending any speaker product, inspect all hardware, suspension, cabinets, transducers, brackets and associated equipment for damage. Any missing, corroded, deformed or non-load rated component could significantly reduce the strength of the installation, placement, or array. Any such condition severely reduces the safety of the installation and should be immediately corrected. Use only hardware which is rated for the loading conditions of the installation and any possible short-term unexpected overloading. Never exceed the rating of the hardware or equipment. Consult a licensed, professional engineer when any doubt or questions arise regarding a physical equipment installation.
Mounting points for high or mid-high system
*TD-000177-00*
TD-000177-00 rev.C © Copyright 2004, QSC Audio Products, Inc.
QSC® is a registered trademark of QSC Audio Products, Inc. “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office
Connections
Normal Connection
The LF-4315 has barrier strip screw terminals for connection. The terminals accept up to #10 AWG (5.3mm2) stranded loudspeaker wiring. Use the largest wire size and shortest wire length possible for a given installation. Observe the polarity markings and keep polarity consistent throughout the system for best performance.
Parallel Connection of Second LF-4315
The terminals marked OUTPUT may be used to connect another LF-4315 in parallel. Connect the wires as shown in the illustration, at right.
Normal Connection Example:
Amplifier capable of driving 5.5 ohm loads
Parallel Connection Example:
Amplifier capable of driving 2.75 ohm loads
LF-4315 Specifications (subject to change without notice)
Frequency Range: |
32 - 1200 Hertz (-6dB) |
28 - 2800 Hertz useable range (-10dB)
Nominal Coverage: |
125° horizontal X 60° vertical at 315 Hertz |
Maximum Output: |
136.0dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz. |
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130.0dBA SPL calculated maximum continuous, 1 meter. The dBA scale is typically used to identify sound sources |
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which can cause permanent hearing loss. |
Impedance: |
5.5 ohms nominal |
4.5 ohms minimum, 150 Hertz
30 ohms maximum, 22 Hertz
Maximum Input Power: 1200 watts rms (8 hours of 6dB crest factor pink noise, 40 - 400 Hertz) 1500 watts rms (2 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
recommended amplifier power capability2400 watts rms maximum into 4 ohms (per LF-4315)
Sensitivity: |
99.0dB half space, 98.0dB full space, 35 - 1000 Hertz, 1 watt, 1 meter |
Recommended Processing: |
Subsonic filter below 25 Hertz, >18 dB per octave, maximum recommended crossover frequency is 500 Hertz. QSC DSP |
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configurations are available at www.qscaudio.com. Parameters for alternative processing hardware are available upon |
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request. |
Connectors: |
Barrier strip screw terminals accept up to #10 AWG (5.3mm2) stranded wire. Four terminals: (two INPUT and two par- |
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allel OUTPUT). |
Transducers: |
Three 15” (381mm) high efficiency low frequency transducer featuring vented 4” (100mm) copper voice coil on Kap- |
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ton® formers. High excursion/low distortion design, with extremely high power handling, and low thermal compres- |
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sion. |
Enclosure: |
Quasi B4 alignment, ported enclosure with fully flared ports, low turbulence symmetrical port design, tuned to 34 |
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Hertz, constructed of medium density fiberboard and heavily braced. Features vandal resistant woofer mounting bolts. |
Size: |
30” wide X 53” high X 20” deep (762mm X 1321mm X 508mm) |
Weight: |
290 lbs. shipping, 260 lbs. net (132/118 kg.) |
SPL and Impedance vs. Frequency
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SPL 2pi |
Impedance (ohms) |
SPL (dB) |
SPL 4pi |
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Impedance |
Frequency (Hertz)
Warranty (USA only; other countries, see your dealer or distributor)
Disclaimer
QSC Audio Products, Inc. is not liable for any damage to amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of this loudspeaker product.
QSC Audio Products 3 Year Limited Warranty
QSC Audio Products, Inc. (“QSC”) guarantees its products to be free from defective material and / or workmanship for a period of three (3) years from date of sale, and will replace defective parts and repair malfunctioning products under this warranty when the defect occurs under normal installation and use - provided the unit is returned to our factory or one of our authorized service stations via pre-paid transportation with a copy of proof of purchase (i.e., sales receipt). This warranty provides that the examination of the return product must indicate, in our judgment, a manufacturing defect. This warranty does not extend to any product which has been subjected to misuse, neglect, accident, improper installation, or where the date code has been removed or defaced. QSC shall not be liable for incidental and/or consequential damages. This warranty gives you specific legal rights. This limited warranty is freely transferable during the term of the warranty period.
Customer may have additional rights, which vary from state to state.
In the event that this product was manufactured for export and sale outside of the United States or its territories, then this limited warranty shall not apply. Removal of the serial number on this product, or purchase of this product from an unauthorized dealer, will void this limited warranty. Periodically, this warranty is updated. To obtain the most recent version of QSC’s warranty statement, please visit www.qscaudio.com. Contact us at 800-854-4079 or visit our website at www.qscaudio.com.
Contacting QSC Audio Products
Mailing address:QSC Audio Products, Inc. 1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 USA
Telephone Numbers:
Main Number (714) 754-6175
Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079
Customer Service(714) 957-7150 or toll free (USA only) (800) 772-2834
Facsimile Numbers:
Sales & Marketing Fax(714) 754-6174
Customer Service Fax(714) 754-6173
World Wide Web:www.qscaudio.com E-mail:info@qscaudio.com service@qscaudio.com
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA ©2004 “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.
Kapton® is a registered trademark of E.I. du Pont de Nemours and Company.
1675 MacArthur Blvd., Costa Mesa, CA, 92626 EE.UU.
Número principal +1 (714) 754-6175 Ventas y Comercialización +1 (714) 957-7100 o línea sin costo (sólo para EE.UU.) +1 (800) 854-4079
Servicio al cliente +1 (714) 957-7150 o gratis (sólo EE.UU.) +1 (800) 772-2834
Manual del usuario de los sistemas de altavoces para salas de cine Altavoz de baja frecuencia LF-4315
Introducción
La caja de baja frecuencia de 15” (381 mm) del altavoz LF-4315 está diseñada específicamente para aplicaciones cinematográficas. El cumplimiento de los requisitos de las aplicaciones cinematográficas referentes a una respuesta extendida de baja frecuencia, es lo que distingue al altavoz LF-4315 de otros sistemas woofer tipo “rock-and-roll” más convencionales. El altavoz LF-4315 cubre un intervalo de frecuencia de 30 Hertzios a 500 Hertzios, dependiendo de los requisitos del sistema de alta frecuencia.
Los tres transductores adaptados de 400 vatios y 15” se desarrollaron específicamente para su uso en salas de cine. Cuentan con bobinas de voz de 4” (100 mm), imanes cerámicos de 120 onzas (3.4 kg) y polos multiventilados para asegurar una operación fría. Las temperaturas más frías aumentan la vida útil del transductor y reducen la compresión de la potencia a niveles altos de potencia. Los polos proyectados aseguran que las bobinas de voz operen en campos magnéticos simétricos, reduciendo la deformación armónica de segundo orden. La suspensión y las bobinas de voz de los transductores se han diseñado para brindar una baja distorsión y graves de alto impacto a alta potencia.
La caja está construida de paneles de cartón duro mediano de alta calidad con soportes de refuerzo en todos los paneles. Ambas aberturas del puerto, la interna y la externa, están totalmente redondeadas, lo cual asegura un flujo de aire uniforme a mayores niveles de potencia, evitando turbulencia audible en el puerto.
Los puertos de graves están separados simétricamente a cada lado de los transductores, haciendo que la presión interna sea más uniforme a través de la superficie posterior de los transductores. Esto evita que los conos sean desplazados de un lado a otro por fuerzas no equilibradas, reduciendo la probabilidad de impulsar las bobinas de voz fuera del centro de los espacios a altos niveles de potencia.
Tres tuercas en T en la parte superior de la caja permiten el montaje fácil del sistema de alta frecuencia HF-75 o del sistema de frecuencia media alta MH-1075, ambos de QSC.
La caja no esta diseñada para montarse suspendida, en voladizo ni sobre arneses. No suspenda esta caja, no la monte en voladizo ni sobre arneses.
Este producto es capaz de producir niveles de presión del sonido que pueden causar daños permanentes al oído humano. Siempre mantenga los niveles de presión del sonido en un área de audición con un nivel menor que el que provoca daños al oído humano.
Instale de acuerdo con las instrucciones de QSC Audio Products y de un ingeniero profesional con la debida licencia. Sólo use piezas, montajes, accesorios y soportes especificados por QSC Audio Products, Inc. Refiera todo el servicio a personal calificado. Cuando el aparato haya sido dañado de alguna manera, es necesario proporcionarle servicio.
¡ADVERTENCIA! Antes de colocar, instalar, montar o suspender cualquier producto de altavoz, inspeccione todo el equipo físico, la suspensión, los armarios, los transductores, los soportes y el equipo asociado para detectar la existencia de daños. Cualquier componente faltante, corroído, deformado, o sin carga nominal podría reducir significativamente la resistencia de la instalación, la colocación o la configuración. Cualquier condición de este tipo reduce gravemente la seguridad de la instalación y debe corregirse de inmediato. Use sólo herraje que esté clasificado para las condiciones de carga de la instalación y cualquier posible carga excesiva a corto plazo inesperada. Nunca exceda el valor nominal del equipo físico ni del dispositivo. Consulte a un ingeniero profesional con la debida licencia cuando surjan dudas o preguntas referentes a la instalación física del equipo.
Puntos de montaje para el sistema de alta frecuencia o el sistema de frecuencia media alta
TD-000177-00 rev. C © Derechos de autor 2004, QSC Audio Products, Inc.
QSC® es una marca comercial registrada de QSC Audio Products, Inc. “QSC” y el logotipo de QSC están registrados con la Oficina de Patentes y Marcas Comerciales de los Estados Unidos
Conexiones
Conexión normal
El altavoz LF-4315 tiene terminales de tornillo de barra protectora para su conexión. Los terminales aceptan cableado trenzado de hasta #10 AWG (5.3 mm2) para altavoces. Use el alambre del calibre más grande y de la longitud más corta posible en cualquier instalación. Observe las marcas de polaridad y mantenga la polaridad uniforme en todo el sistema para permitir el mejor rendimiento.
Conexión en paralelo de un segundo LF4315
Los terminales marcados SALIDA se pueden usar para conectar en paralelo otro altavoz LF-4315. Conecte los cables como se muestra en la ilustración, a la derecha.
Ejemplo de una conexión normal:
Ejemplo de conexión en paralelo:
Amplificador con capacidad de accionamiento de cargas de 5.5 ohmios
Amplificador con capacidad de accionamiento de cargas de 2.75 ohmios
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