QSC Audio SB-5218, SB-7218 User Manual

Features

• SB-5218 features dual 500 W transducers

• SB-7218 features dual 700 W transducers

SB-5218/SB-7218

Cinema Subwoofers

• Frequency range extends to below 25 Hz when used with
the correct B6 filter

• DCM and SF-3 signal processors optionally available

• Enclosures feature vandal-resistant woofer mounting bolts

™ approved for professional cinema applications

• THX

Part of the DCS Digital Cinema Speaker Series, QSC’s
SB-5218 and SB-7218 subwoofers offer a unique
solution that addresses the requirements of digital

Specifications SB-5218 SB-7218

Frequency Range

motion picture soundtracks. Featuring dual 18" low­frequency transducers mounted in ported enclosures,
these systems extend response to the lowest audible
frequency.

The two custom 18" transducers were developed
especially for cinema use. The woofers feature
4" voice coils and vented pole pieces to ensure
cool operation, even at high power levels. Cooler
temperatures increase driver lifespan and decrease
power compression at high drive levels. Undercut pole
pieces provide a symmetrical magnetic gap, reducing
second harmonic distortion.

Enclosures are constructed of high-quality MDF
panels and feature individual woofer chambers. The
separate chamber for each transducer makes the
enclosure stronger, provides rigidity, and prevents
cone overexcursion in the rare event of a driver failure.
Enclosure “loading” is not lost for the remaining
transducer.

Large, fully radiused ports ensure smooth airflow,
especially at higher drive levels. This prevents
potentially audible port turbulence noise. Both internal
and external port openings are flared.

-10 dB half space 19 Hz - 250 Hz 19 Hz - 250 Hz

Maximum Output2

Calculated Peak at Rated Power 135 dB 137 dB

Calculated Continuous 129 dB 130 dB

Impedance 4

Maximum Input Power

100 hours of 6 db crest factor 800 W RMS 1200 W RMS
IEC 268 noise spectrum

2 hours of 6 db crest factor 1000 W RMS 1500 W RMS
pink noise, 50 Hz - 20 kHz,
AES method

Recommended Amplifier Power 1600 W RMS maximum 2600 W RMS maximum

Sensitivity 1 watt /1 meter, 99.5 dB 101 dB
half space

Transducers Two 18" (457 mm) 500 W high Two 18" (457 mm) 700 W high
efficiency subwoofer transducers efficiency subwoofer transducers
featuring 4" (100 mm) copper featuring 4" (100 mm) copper
coils on Kapton formers coils on Kapton formers

Recommended Processing LF boost frequency = 25 Hz, Q = 2.0, Gain = +6 dB provided by QSC,
SF-3 or DCM

Connectors Barrier strip screw terminals accept up to #10 AWG stranded wire

Enclosure B6 alignment, vented enclosure with summetrical port design, tuned to

With symmetrical port loading, the bass ports are
evenly spaced on each side of the transducers, making
internal pressure more uniform across the back
surface of the woofer. This prevents the cone from
being displaced to one side or another by unbalanced

Dimensions (HWD) 30" x 48" x 24"
(762 mm x 1220 mm x 610 mm)

Weight - Net 205 lbs (93 kg) 210 lbs (95 kg)

air pressure, reducing the chance of driving the voice
coil out of the center of the gap at high drive levels.

THX is a trademark of THX Ltd.

1) All frequency ranges specified refer to measured free field response (half space, 2π).

2) Calculated SPL at 1m, (half space, 2π), speaker operating at rated RMS power with pink noise within specified frequency range.

3) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.

1

-6 dB half space 24 Hz - 100 Hz 22 Hz - 100 Hz

Ω nominal 4Ω nominal

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25 Hz, constructed of MDF and heavily braced. Features vandal resistant
woofer mounting bolts

SB-5218/SB-7218

Dimensions

30"

762 mm

Specifications subject to change without notice.

Front

48"

1219.2 mm

Side

4.475"

113.7 mm

11.45"

290.8 mm

24"

609.6 mm

1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone]

SB-5218/SB-7218 Spec Sheet - 03/10/06

qscaudio.com

1675 MacArthur Blvd., Costa Mesa, CA, 92626 USA
Main Number [phone] Sales & Marketing [phone] or toll free (USA only) [phone]
Customer Service(714) 957-7150 or toll free (USA only) [phone]

Cinema Loudspeaker Systems User Manual

SB-5218 and SB-7218 Dual-18” Subwoofers

Introduction

The SB-5218 and SB-7218 are specially designed cinema subwoofers, featuring dual 500
and 700 watt, respectively, 18” (460mm) low-frequency transducers mounted in ported
enclosures. The enclosures are tuned to 25 hertz and use a B6 alignment. These should be
used with the B6 boost filter option provided by the QSC SF-1 or SF-3 Subwoofer Filter mod­ules or the QSC Digital Cinema Monitor to ensure extended response to the lowest audible
frequencies.

Meeting cinema requirements for the extended low frequency response differentiates the
SB-5218 and SB-7218 from more conventional “rock-and-roll” subwoofer systems. Their fre­quency range extends to below 25 hertz when used with the correct B6 filter.

The two custom 500 watt (700 watt, SB-7218), 18” transducers were developed especially
for cinema use. The woofers feature 4” (100mm) voice coils and vented pole pieces to
ensure cool operation, even at high power levels. Cooler temperatures increase driver
lifespan and decrease problematic power compression at high drive levels. Undercut pole
pieces provides a Symmetrical Magnetic Gap (SMG), reducing second harmonic distortion.

Enclosures are constructed of high quality MDF panels and feature Single Woofer Chambers
(SWC). The separate chamber for each transducer makes the enclosure stronger, provides
rigidity, and prevents cone over-excursion in the rare event of a driver failure (enclosure
“loading” is not lost for the remaining transducer).

Large, Fully Radiused Ports (FRP) ensure smooth air flow through the ports, especially at
higher drive levels. This prevents potentially audible port turbulence noise. Both internal and
external port openings are fully radiused.

With Symmetrical Port Loading (SPL) bass ports are evenly spaced on each side of the trans­ducers, making internal pressure more uniform across the back surface of the transducer.
This prevents the cone from being displaced to one side or another by unbalanced air pres­sure, reducing the chance of driving the voice coil out of the center of the gap at high drive
levels.

Enclosure is not designed to be suspended, flown, or rigged. Do not sus­pend, fly, or rig this enclosure.

EN

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.

*TD-000150-00*

© Copyright 2003, 2004, QSC Audio Products, Inc.

“QSC” and the QSC logo are registered with the U.S. Pa tent and Trademark Office

QSC® is a registered trademark of QSC Audio Products, Inc.

TD-000150-00 rev.B

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Connections

EN

Normal Connection

The SB-5218/7218 has barrier strip screw ter­minals for connection. The terminals accept up
to #10 AWG 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 SB-5218/7218

The terminals marker SPK2 may be used to con­nect another SB-5218/7218 in parallel. Connect
the wires as shown in the illustration, at right.
Note: If the SB-5218/7218’s internal wiring has
been modified in any way, this may not func­tion. If this is the case, remove the terminal cup
and verify the presence of the factory yellow
jumper and blue jumper wires; remedy as
required or have the loudspeaker serviced.

Normal Connection Example:

Parallel Connection Example:

Individual Transducer Connection (requires
modification)

The transducers are wired in parallel inside the
enclosure. If individual transducer connection is
required, remove the terminal cup and remove
the yellow and the blue jumper wires that are
connected between the SPK1 and SPK2 termi­nals. Replace the terminal cup and mark the
enclosure with a note of the modification.

2

Individual Transducer
Connection Example:

Specifications (subject to change without notice)

Frequency Range: 24 - 100 Hz (±3 dB) 22 - 100 Hertz (±3 dB)

SB-5218 SB-7218

19 - 250 Hz useable range (-10 dB) 19 - 250 Hertz useable range (-10 dB)

Maximum Output:

135 dB SPL calculated peak 137 dB SPL calculated peak

1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 25 - 250 Hertz.

129 dBA SPL calculated maximum continuous 130.5 dBA SPL calculated maximum continuous

1 meter. The dBA scale is typically used to identify sound sources which can cause permanent hearing loss.

Impedance: 4 ohms, nom. (3.2 @ 25 Hz., 62 @ 50 Hz.) 4 ohms, nom. (3.2 @ 27 Hz., 28 @ 48 Hz.)

Maximum Input Power:

100 hours of 6 dB crest factor 800 watts rms 1200 watts rms
pink noise, 25 - 250 Hertz

2 hours of 6 dB crest factor
pink noise, 25 - 250 Hertz, AES method

1000 watts rms 1500 watts rms

Recommended Amp Power: 1600 watts rms maximum 2600 watts rms maximum

Sensitivity: 99.5 dB half space 101.0 dB half space

(25 - 100 Hz, 1 watt, 1 m.) 93.5 dB full space 95.0 dB full space

Weight: 225 lbs. shipping, 205 lbs. net (102/93 kg.) 230 lbs. shipping, 210 lbs. net (104/95 kg.)

Both Models­Nominal Coverage: Omnidirectional (80 Hz)

Recommended Processing: LF boost- freq.= 25 Hz, Q=2.0, gain= +6 dB. QSC DSP configurations are available at www.qscaudio.com. Parameters for

alternative processing hardware are available upon request.

EN

Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals: (two INPUT and two PARALLEL OUT).

Drivers are internally wired in parallel. For independent transducer connection, remove blue jumper wire and yellow
jumper wire on internal-side of terminal cup and mark enclosure accordingly.

Transducers: Two 18” (457mm) high efficiency subwoofer transducers featuring vented 4” (100mm) copper voice coils on Kapton®

formers. High excursion/low distortion design, with extremely high power handling, and low thermal and port com­pression.

Enclosure: B6 alignment, vented enclosure with symmetrical port design, tuned to 25 Hz, constructed of medium density fibre-

board and heavily braced. Features vandal resistant woofer mounting bolts.

Size: 30” wide X 48” high X 24” deep (762 mm X 1220 mm X 610 mm)

3

EN

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 [phone]
Sales & Marketing [phone] or toll free (USA only) [phone]
Customer Service(714) 957-7150 or toll free (USA only) [phone]

Facsimile Numbers:
Sales & Marketing Fax[phone]
Customer Service Fax[phone]

World Wide Web:www.qscaudio.com
E-mail:[e-mail]
[e-mail]

QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA

©2003, 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.

4

1675 MacArthur Blvd., Costa Mesa, CA, 92626 EE.UU.
Número principal [phone] Ventas y Comercialización [phone] o línea sin costo (sólo
para EE.UU.) [phone]
Servicio al cliente [phone] o línea sin costo (sólo en EE.UU.) [phone]

Manual del usuario de los sistemas de altavoces para salas de cine

Subwoofers dobles de 18" SB-5218 y SB-7218

Introducción

Los subwoofers SB-5218 y SB-7218 están especialmente diseñados para salas de cine, cuentan
con dos transductores de baja frecuencia de 18” (460mm), de 500 y de 700 vatios,
respectivamente, montados en cajas con puertos. Las cajas están afinadas a 25 hertz y usan una
alineación B6. Deben usarse con la opción de filtro intensificador B6 proporcionada por los
módulos de filtro de subwoofer QSC SF-1 o SF-3 o por el monitor de cine digital QSC para
asegurar la respuesta extendida a las frecuencias audibles más bajas.

El cumplimiento de los requisitos de salas de cine respecto a la respuesta extendida de baja
frecuencia distingue a los subwoofers SB-5218 y SB-7218 de los sistemas de subwoofers tipo
“rock-and-roll” más convencionales. Su intervalo de frecuencia se extiende por debajo de los 25
hertz cuando se usan con el filtro B6 correcto.

Los dos transductores de 18", de 500 vatios (700 vatios para el SB-7218) se desarrollaron
específicamente para su uso en salas de cine. Los woofers tienen bobinas de voz de 4” (100 mm)
y polos ventilados para asegurar una operación fría, incluso a niveles de alta potencia. Las
temperaturas más frías aumentan la vida útil del excitador y reducen la problemática compresión
de la potencia a niveles altos de excitación. El polo proyectado proporciona un campo magnético
simétrico (Symmetrical Magnetic Gap, SMG), reduciendo la segunda deformación armónica.

ES

Las cajas están construidas con paneles MDF (cartón duro de densidad media) y tienen cámaras
de woofer sencillo (Woofer Chambers, SWC). La cámara separada para cada transductor
proporciona a la caja resistencia, rigidez, y evita la excursión excesiva del cono en el raro evento
de una falla del excitador (la "carga" de la caja no se pierde para el transductor restante).

Los grandes puertos totalmente redondeados (Fully Radiused Ports, FRP) aseguran un flujo de aire
uniforme a su través, especialmente a niveles mayores de excitación. Esto evita ruido de
turbulencia en el puerto potencialmente audible. Ambas aberturas del puerto, la interna y la
externa, están totalmente redondeadas.

Con la carga simétrica de los puertos (Symmetrical Port Loading, SPL), los puertos de bajos están
igualmente separados a cada lado de los transductores, haciendo que la presión interna sea más
uniforme a través de la superficie posterior del transductor. Esto evita que el cono sea desplazado
de un lado a otro por la presión no equilibrada del aire, reduciendo la probabilidad de impulsar la
bobina de voz fuera del centro del espacio a altos niveles de excitación.

La caja no está 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 herraje, 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 carga excesiva a corto plazo inesperada posible.
Nunca exceda el valor nominal del herraje ni del dispositivo. Consulte a un
ingeniero profesional con la debida licencia cuando surjan dudas o preguntas
referentes a la instalación física del equipo.

*TD-000150-00*

© Derechos de autor 2003, 2004, QSC Audio Pro ducts, 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

TD-000150-00 rev.B

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