QSC SC-412 Manual
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Developed specifically for the unique requirements
of professional motion picture playback, the SC-412
extends QSC’s commitment to the cinema market. As
a member of the DCS Digital Cinema Speaker Series,
the SC-412 is a two-way, bi-amplified screen channel
loudspeaker system comprised of two main units—the
HF-75 high-frequency system and the LF-4115 low-
frequency system.
The HF-75 high-frequency system features a 3 large "
format (75mm) titanium diaphragm compression
driver mounted on a custom designed high-frequency
cinema horn with an adjustable pan and tilt bracket.
The HF-75 includes a driver protection and equalization
network. DC blocking capacitors protect against DC or
low-frequency signals that would likely destroy an
unprotected driver. Power limiter circuitry protects the
driver from overpowering and a response correction
filter smoothes the frequency response of the horn/
driver combination. The driver and equalization
network provides for more reliable operation, ensuring
the show will go on.
The LF-4115 15 (381mm) low-frequency enclosure "
is designed specifically to address the extended low-
frequency response required for cinema applications.
The LF-4115 covers the frequency range from
35 Hz to 1000 Hz, depending upon the high-
frequency system requirements.
The SC-412 is designed for ease of installation.
The HF-75 components come pre-assembled to
reduce field assembly time. Three bolts are all that
are required to secure the HF-75 to the top of the
LF-4115 enclosure.
SC-412
Cinema Loudspeaker System
Specifications SC-412
Nominal Coverage 90° horizontal x +20 to -30° vertical
Frequency Range 33 Hz - 16 kHz (-6 dB)
Crossover Frequency 700 Hz, 24 dB per octave
LF-4115 HF-75
Impedance 4 8Ω Ω
Sensitivity 1 watt /1 meter, 93.5 dB 107.5 dB
half space
Maximum Input Power1
8 hours of 6 db crest factor 400 W RMS 60 W RMS
IEC 268 noise spectrum
2 hours of 6 db crest factor 500 W RMS 80 W RMS
pink noise, 50 Hz - 20 kHz,
AES method
Recommended Amplifier Power 800 W RMS maximum 100 W RMS maximum
Recommended Processing Subsonic filter below 30 Hz, 4th order LR crossover at 700 Hz
> 18 dB per octave
Connectors Barrier strip screw terminals Barrier strip screw terminals
accept up to #10 AWG stranded accept up to #10 AWG stranded
wire, four terminals; two inputs wire, four terminals; two inputs
and two parallel outputs and two parallel outputs
Transducers One 15" (381mm) high efficiency, 1.5" (38mm) exit, 3" titanium
extended bass woofer featuring a diaphragm compression driver
4" copper voice coil
Enclosure Quasi B4 alignment, ported Tilt/Pan Bracket
enclosure with fully flared ports, ±10° vertical tilt
symmetrical port design, tuned to ±10° horizontal pan
36 Hz, constructed of MDF and
heavily braced. Features vandal
resistant woofer mounting bolts
Dimensions (HWD) 18.5" x 30" x 20.3" 16" x 30" x 20"
(470 mm x 762 mm x 516 mm) (406 mm x 762 mm x 508 mm)
Weight - Net 83 lbs (38 kg) 40 lbs (18.4 kg)
System Weight 123 lbs (56.4 kg)
Baffle Cut-Out 35.5" x 32"
1) Maximum input power tested in accordance with IEC 268-5 recommendations, 50 Hz - 20 kHz band limiting, 6 dB signal crest factor.
Features
• Two-way, bi-amplified screen channel system
• SC-412 provides 90° horizontal by +20° to -30° vertical coverage
• Low-distortion waveguides provide highly articulate dialogue
• Shallow depth (20") facilitates installation
SC-412
Dimensions
qscaudio.com
Specifications subject to change without notice.
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
SC-412 Spec Sheet - 02/22/06
Top
Side
21.53"
546.9 mm
20.25"
514.4 mm
30"
762 mm
Front
33.83"
859.3 mm
15.46"
392.6 mm
18.38"
466.8 mm
9.7"
246.4 mm
4"
101.6 mm
20.25"
514.4 mm
HF-75 Specifications (subject to change without notice)
Frequency Range: 600 - 16k Hz (-6 dB, full space)
Nominal Coverage: 90° horizontal X +15° to -35° vertical (50° total, adjustable mount provides for vertical plane adjustments. The
horizontal plane can be adjusted by altering mounting position on the LF-4215 enclosure before tightening bolts.
DI: 9.0 dB (600 to 16,000 Hertz average)
Q: 8.0 (600 to 16,000 Hertz average)
Maximum Output: 133 dB SPL calculated peak, 1 meter, half space.
Impedance: 8 ohms nominal
8.0 ohms minimum at 3,000 Hertz
104 ohms maximum at 475 Hertz
Maximum Input Power: 60 watts rms (100 hours of 6 dB crest factor pink noise, 500 to 20,000 Hertz, IEC method)
80 watts rms (2 hours of 6 dB crest factor pink noise, 60 - 6,000 Hertz, AES method)
Sensitivity: 108 dB half space, 1 watt, 1 meter
Crossover Frequency: 700 Hertz or higher, 24 dB per octave
Connectors: Barrier strip screw terminals accept up to #10 AWG stranded wire. Four terminals: (two HF INPUT and two post
compensation HF OUTPUT). HF OUTPUT factory wired to compression driver.
Transducers: 1.5” (38mm) exit, 3.0” (76mm) titanium diaphragm compression driver.
Mounting Hardware: Attaches to top of low frequency cabinet using three 5/16”-18 x 3/4” long bolts.
Size: 30” wide X 16” high X 20” deep (762mm X 406mm X 508mm)
Weight: 50 lbs. (shipping), 40 lbs. (net), 22.7/18.4 kilograms
SPL and Impedance vs. Frequency
SPL (dB)
Frequency (Hertz)
Impedance (Ohms)
Impedance
SPL
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 lim-
ited 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 war-
ranty 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
©2003, 2004 “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.
*TD-000171-00*
Cinema Loudspeaker Systems User Manual
LF-4115 Low Frequency Loudspeaker
Introduction
The LF-4115 15” (381mm) low frequency enclosure is designed specifically for cinema appli-
cations. Meeting cinema requirements for extended low frequency response differentiates
the LF-4115 from more conventional “rock-and-roll” woofer systems. The LF-4115 covers the
frequency range from 33 Hertz to 1200 Hertz, depending upon the high frequency system
requirements.
The custom 400 watt, 15” transducer was developed specifically for cinema use. It features
a 4” (100mm) voice coil, 120 oz.(3.4kg) ceramic magnet, and a multi-vented pole piece to
ensure cool operation. Cooler temperatures increase transducer lifespan and decrease the
problem of power compression at high power levels. An undercut pole piece ensures the
voice coil operates in a symmetrical magnetic gap, reducing second order harmonic distor-
tion. The suspension and voice coil of the transducer have been designed to provide low dis-
tortion and high impact bass at high power.
The enclosure is constructed of high quality medium density fiberboard panels with stiffen-
ing braces on all six 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 transducer, making internal pres-
sure more uniform across the back surface of the transducer. This prevents the cone from
being displaced to one side or another by unbalanced forces, reducing the chance of driving
the voice coil out of the center of the gap at high power.
Three T-nuts in the top of the enclosure provide easy mounting of QSC’s HF-75 high fre-
quency system, or MH-1063 mid-high system.
Enclosure is not designed to be suspended, flown, or rigged. Do not sus-
pend, fly, or rig this enclosure.
This product is capable of producing sound pressure levels that can perma-
nently 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, accesso-
ries, 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 installa-
tion.
TD-000171-00 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
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
Mounting points for high or
mid-high frequency system
LF-4115 Specifications (subject to change without notice)
Frequency Range: 33 - 1200 Hertz (-6dB)
29 - 3000 Hertz useable range (-10dB)
Nominal Coverage: 100° horizontal X 100° vertical at 1000 Hertz
Maximum Output:
127.0dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 35 - 1000 Hertz.
121.0dBA 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 nominal
4.3 ohms minimum, 160 Hertz
40 ohms maximum, 22 Hertz
Maximum Input Power: 400 watts rms (8 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
600 watts rms (2 hours of 6dB crest factor pink noise, 40 - 400 Hertz)
recommended amplifier power capability- 1100 watts rms maximum into 4 ohms (per LF-4115)
Sensitivity: 93.5dB half space, 92.0dB full space, 35 - 1000 Hertz, 1 watt, 1 meter
Recommended Processing: Subsonic filter below 30 Hertz, >18 dB per octave, maximum recommended crossover frequency is 1000 Hertz. QSC
DSP configurations are available at www.qscaudio.com. Parameters for alternative processing hardware are available
upon request.
Connectors: Barrier strip screw terminals accept up to #10 AWG (5.3mm 2) stranded wire. Four terminals: (two and two par-INPUT
allel OUTPUT).
Transducers: 15” (381mm) high efficiency low frequency transducer featuring vented 4” (100mm) copper voice coil on Kapton®
formers. High excursion/low distortion design, with extremely high power handling, and low thermal and port com-
pression.
Enclosure: Quasi B4 alignment, ported enclosure with fully flared ports, low turbulence symmetrical port design, tuned to 36
Hertz, constructed of medium density fibreboard and heavily braced. Features vandal resistant woofer mounting bolts.
Size: 30” wide X 18” high X 20” deep (762mm X 457mm X 508mm)
Weight: 96 lbs. shipping, 83 lbs. net (44/38 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SPL (dB)
Impedance (ohms)
SPL 2pi
Impedance
SPL 4pi
Manual del usuario de los sistemas de altavoces para salas
de cine
Componente de alta frecuencia HF-75
Introducción
El HF-75 es el componente de alta frecuencia de los altavoces bidireccionales
SC-412 y SC-422 de canal de pantalla biamplificada, para aplicaciones cine-
matográficas de alto rendimiento. El sistema se envía como dos componentes
separados: el sistema de alta frecuencia HF-75 y el sistema de woofer LF-4115 o
LF-4215.
El sistema HF-75 de alta frecuencia tiene un formato grande, un excitador de
compresión con diafragma de titanio de 3” (75 mm) montado en un cuerno cine-
matográfico de alta frecuencia de diseño bajo especificaciones con un soporte
de movimiento horizontal y vertical ajustable. El cuerno tiene amplios ángulos
de cobertura horizontal y vertical para asegurar la cobertura de cada asiento del
auditorio. El cuerno es una guiaonda de baja deformación que proporciona un
diálogo altamente articulado sin la coloración de "bocina" asociada con los
altavoces de cuerno convencionales.
El HF-75 incluye protección del excitador y una red de ecualización. Los capaci-
tores de bloqueo de CC protegen contra señales de CC o de baja frecuencia que
probablemente destruirían un excitador no protegido. El circuito limitador de
potencia protege al excitador contra las sobrecargas, y un filtro de corrección de
respuesta suaviza la respuesta de frecuencia de la combinación cuerno/excita-
dor. El excitador y la red de ecualización proporcionan una operación más confi-
able, asegurando la continuación del espectáculo.
Los componentes del sistema HF-75 vienen ya montados para reducir el tiempo
de montaje en el campo. Tres pernos es todo lo que se requiere para fijar el HF-
75 en la parte superior de la caja del sistema de baja frecuencia.
Montaje
Vea la información sobre el montaje en la ilustración. El HF-75 se conecta en la parte
superior del LF-4115 o LF-4215 con tres pernos de 5/16-18, de 0.75” de largo, con
arandelas de fijación. Recomendamos el uso de un compuesto duradero para fijación
de roscas al instalar los pernos para evitar que se aflojen debido a la vibración. Ori-
ente el cuerno en el plano horizontal antes de apretarlo. Ajuste la posición vertical
con el soporte de ajuste.
Instale de acuerdo con las instrucciones de QSC Audio Products y
de un ingeniero profesional con la debida licencia. Sólo use piezas,
montajes, accesorios o 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 pro-
porcionarle 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 condi-
ciones de carga de la instalación y cualquier posible carga exce-
siva 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 pregun
t as referentes
a la instalación física del equipo.
TD-000149-00 rev.D
© Derechos de autor 2003, 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
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
Conexiones
El HF-75 tiene terminales de tornillo de barra protectora que aceptan alambre trenzado de calibre de hasta #10 AWG para altavoces.
Terminales de ENTRADA de HF
Conecte la señal de salida del amplificador en los terminales de ENTRADA de HF del altavoz. Observe la polaridad adecuada; ampli-
ficador + señal al altavoz + ENTRADA de HF, amplificador - señal al altavoz - ENTRADA de HF. Use el alambre de calibre más grande
y de longitud más corta para la aplicación.
¡NOTA! Mantenga la polaridad adecuada en la conexión del altavoz en todo el sistema para obtener el máx-
imo rendimiento. ¡No aplique una señal de intervalo total al HF-75! No hay cruce en el HF-75, sólo una red de
compensación/demora. Todo el procesamiento de señales requerido debe hacerse antes del HF-75.
Terminales de SALIDA de HF
Los terminales de SALIDA de HF se conectan en fábrica al excitador de compresión. Estos terminales SÓLO se deben conectar al
excitador de compresión del HF-75.
DCM de QSC u otro cruce activo
Excitador de compresión del HF-75
Amplificador
Señal procesada del pro-
grama de alta frecuencia
Terminales de con-
exión del HF-75 Nota: ¡La caja de conexión del HF-75 no
contiene una red de cruce! Asegúrese
que sólo se aplique la señal de alta fre-
cuencia a los terminales de ENTRADA de
HF, porque de lo contrario, pueden ocurrir
daños al excitador de compresión.
Produkt Specifikationer
| Mærke: | QSC |
| Kategori: | Højttaler |
| Model: | SC-412 |
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