QSC MHV-1090 User manual

*TD-000246-00*
Cinema Mid-High-Very High Loudspeaker System User Manual
MHV-109010” (254mm) mid, coax high- very high compression driver
Introduction
The MHV-1090 system provides the mid, high, and very high frequency components of
four-way screen channel loudspeaker system for high performance cinema applica-
tions. It was designed to operate with and be directly mounted on QSC’s cinema low
frequency enclosures.
The high frequency horn is a low-distortion waveguide providing highly articulate dia-
logue without the coloration associated with conventional horn loudspeakers. Both
horns feature broad horizontal and vertical coverage to ensure audio integrity is deliv-
ered to every seat in the auditorium. The driver assemblies are mounted on an adjust-
able pan and tilt bracket that has an integral aiming sight, simplifying installation.
The MHV-1090 includes a driver protection and high-very high frequency crossover
network to assure reliable operation. DC blocking capacitors protect against DC or
low-frequency signals that could damage an unprotected driver. A 12 dB per octave
crossover seamlessly blends the high and very high frequency elements when oper-
ated in tri-amp mode. Outboard processing is required to form the crossover between
the low, mid, and high-very high frequency drivers.
Tri-amp or quad-amp operation is possible using a selector switch mounted on the
INPUTS connection panel. The tri-amp setting provides a built-in passive crossover
network between high and very high frequency drivers. Separate amplifiers and active
crossovers are required for the low, mid, high-very high frequency channels. Quad-
amp setting disables the internal high-very high frequency crossover and each driver
is driven independently by its own amplifier and active crossover; one each required
for the low, mid, high, and very high frequency drivers.
The MHV-1090 components come pre-assembled to reduce field assembly time. Three
bolts are all that are required to secure the assembly to the top of a QSC low fre-
quency enclosure.
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, enclosures,
transducers, brackets and associated equipment for damage. Any
missing, corroded, deformed or non-load rated component could sig-
nificantly 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 hard-
ware or equipment. Consult a licensed, professional engineer when
any doubt or questions arise regarding a physical equipment installa-
tion.
TD-000246-00-A
© Copyright 2007, 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
30”
(762mm)
39”
(991mm)
20”
(508mm)

2
Settings and Connections
TRI-AMP / QUAD-AMP Operating Mode Selection
Set the operating mode selector switch to TRI-AMP or QUAD-AMP, depending on your screen chan-
nel signal processing and amplification set-up. The mid frequency driver will require connection to its
rear cover terminals, regardless of mode selection. The low frequency driver will also require its own,
separate connections. The only connection difference between tri-amp and quad-amp modes is in
quad-amp mode, the very high frequency signal will require connection to the terminals labeled VHF.
TRI-AMP-When set to TRI-AMP, the MHV-1090 input panel connections accept high frequency/very
high frequency signals on one set of inputs and uses an internal crossover network between the high
and very high frequency drivers.
QUAD-AMP- When set to QUAD-AMP, the MHV-1090 input panel accepts separate high and very
high frequency signals on two separate sets of inputs. The internal crossover network is bypassed and
only the protective circuitry for the high frequency and very high frequency driver remains. Each of the
driver’s signals must have the appropriate upstream signal processing.
•Do not connect amplifiers directly to the high/very high frequency coaxial driver
inputs!
• Always use the crossover INPUTS terminal strip for high and very high frequency
input(s)
•The mid frequency driver and the low frequency enclosure are connected directly
to their own separate amplifiers regardless of mode selector switch setting.
Mounting
Attaching to Low Frequency Enclosure
The MHV-1090 attaches to the top of QSC low frequency enclosures with three 0.75” long 5/16”-18 TPI bolts. ensure the use of lock washers on all bolts.
The bolts and washers ship installed on the low frequency enclosure. We recommend the use of serviceable thread locking compound when installing the
bolts to prevent loosening due to vibration. Do not fully tighten the mounting hardware before aiming in the horizontal plane (see below).
Aiming
Aim the horn in the horizontal plane (pan) before tightening the three bolts securing the MHV-1090 to the low frequency enclosure. Adjust the vertical tilt
with the vertical adjustment bracket. The mid-high assembly is equipped with an aiming sight to assist in achieving desired coverage quickly and easily.
For typical applications, the aim point should be the center seat in the back row of the auditorium. If the cinema screen has already been installed, a flash-
light placed at the desired aiming point can be seen through the screen perforations in a darkened auditorium.
Where the sight holes are located: How to use the sights: Aim point:
HF/VHF
VHF
HF
Mode selector switch set to
TRI-AMP and the required
HF/VHF connection:
Mode selector switch set to
QUAD-AMP and the required sep-
arate HF and VHF connections:

3
INPUTS Terminals
The MHV-1090 has barrier strip screw terminals that accept up to #10 AWG (5.3mm2) stranded loudspeaker wire. Observe proper polarity. Use the
largest wire size and shortest wire length for the application.
OUTPUTS Terminals
The OUTPUT terminals are factory-connected to the high and very high frequency drivers. These terminals should ONLY be connected to their respec-
tive driver. Do not connect signals to these terminals as all protection and equalization circuitry will be bypassed. They are not for daisy chaining the
signals to other drivers.
NOTE! Maintain proper loudspeaker connection polarity throughout the entire system for maximum performance. Do not apply
full range signal to the MHV-1090! There is a high/very high frequency passive crossover for tri-amp mode only. There is no
crossover connected when operating in quad-amp mode. All required signal processing must be done before the signal is
applied to the loudspeaker. Do not connect any signal to the upper sets of OUTPUT terminals.
TRI-AMP mode connections- Ensure the mode selector switch is set to TRI-AMP, connect the low frequency signal to the low frequency enclosure;
connect the mid frequency signal to the mid frequency driver; connect the high/very high frequency signal to the VHF/HF terminals on the INPUTS ter-
minal strip.
LF
MF
HF/VHF
HF/VHF MF LF
Signal Processing
Amplification
Amplification
Low Frequency Enclosure
MHV-1090

4
QUAD-AMP mode connections- Ensure the mode selector switch is set to QUAD-AMP, connect the low frequency signal to the low
frequency enclosure; connect the mid frequency signal to the mid frequency driver; connect the high frequency signal to the HF termi-
nals on the INPUTS terminal strip; connect the very high frequency signal to the VHF terminals on the INPUTS terminal strip.
LF
MF
VHF MF LF
Signal Processing
Amplification
Low Frequency Enclosure
MHV-1090 HF
Amplification
VHF
HF

5
MHV-1090 Specifications (subject to change without notice)
Freq. Range 180 - 20k Hz (-6dB, full space)
Nominal Coverage 90° horizontal X +20 to -30° vertical (50° total, adjustable mount provides for vertical plane adjustments. The horizontal
plane can be adjusted by altering mounting position on the low frequency enclosure before tightening bolts.
DI: 9 dB (400 to 16k Hz average)
Q: 8 (400 to 16k Hz average)
Max. Output:, calculated Mid frequency 135.5 dB SPL
(1 meter, full space) Tri-amp mode: high frequency/very high frequency 138 dB SPL
Quad-amp mode: high frequency 138 dB SPL, very high frequency 135 dB SPL
Impedance: Tri-amp mode: 8 ohms nominal, mid frequency and high/very high frequency
Quad-amp mode:8 ohms nominal, mid, high, and very high frequency
Maximum Input Power Mid frequency: 275 W
(AES method, 2 hours) Tri-amp mode: high/very high frequency 155 W (calculated, sum of high and very high frequency individual ratings)
Quad-amp mode:high frequency 85 W, very high frequency 70 W
Sensitivity Mid frequency: 105 dB SPL
(1 Watt, 1 meter) Tri-amp mode: high/very high frequency 110 dB SPL
Quad-amp mode:high frequency 110 dB SPL
very high frequency 110 dB SPL
Crossover Frequencies Tri-amp mode: mid frequency 250 Hz or higher, high/very frequency 1.7 kHz, both 24 dB/octave
Quad-amp mode: mid frequency 250 Hz or higher, high frequency 1.7 kHz, very high frequency 6.0 kHz, all 24 dB/octave
Crossover Network High frequency to very high frequency crossover at 7 kHz, 12 dB per octave, only in tri-amp mode. Quad-amp mode
switch setting removes crossover circuit from signal path, but leaves DC blocking capacitors in circuit.
Connectors Mid frequency driver: barrier strip screw terminals on mid frequency driver accept up to #10 AWG stranded wire.
High frequency, very high frequency drivers: barrier strip screw terminals accept up to #10 AWG stranded wire
Tri-amp mode connect high frequency/very high frequency program only to VHF/HF INPUTS terminals
Quad-amp mode connect high frequency program to HF INPUTS terminals and connect very high frequency
program to VHF INPUTS terminals.
Transducers Mid frequency: 10" high efficiency mid-range, phase-ring loaded
High frequency: 1.5" exit, 3.5" voice coil polyester diaphragm coaxial compression driver
Very High frequency: 1.5" exit, 1.75" voice coil polyester diaphragm coaxial compression driver
Mounting Hardware: Attaches to top of QSC’s low frequency cinema enclosures using three 5/16”-18 x 3/4” long bolts (supplied on low fre-
quency enclosure)
Size 39” high x 30” wide x 20” deep (991 x 762 x 508mm)
Weight 73.5 lb. (33 kg) net

6
MHV-1090 SPL vs. Frequency, Tri-amp, No Screen
SPL (dB, normalized)
Frequency (Hz)
high/very high
mid
SPL (dB, normalized)
Frequency (Hz)
MHV-1090 SPL vs. Frequency, Quad-amp, No Screen
high
mid
very high

7
MHV-1090 SPL vs. Frequency, X-curve, Tri-amp, With and Without Screen
SPL (dB, normalized)
without screen
with screen
SPL (dB, normalized)
MHV-1090 SPL vs. Frequency, X-curve, Quad-amp, With and Without Screen
Frequency (Hz)
Frequency (Hz)
X-curve +3 dB
X-curve -3 dB
without screen
with screen
X-curve +3 dB
X-curve -3 dB

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:[email protected]
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA
©2007 “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Office.

*TD-000173-00*
Cinema Loudspeaker Systems User Manual
LF-3215 Low Frequency Loudspeaker
Introduction
The LF-3215 dual 15” (381mm) low frequency enclosure is designed specifically for cinema
applications. Meeting cinema requirements for extended low frequency response differenti-
ates the LF-3215 from more conventional “rock-and-roll” woofer systems. The LF-3215 cov-
ers the frequency range from 32 Hertz to 1500 Hertz, depending upon the high frequency
system requirements. With its tight spacing between woofers, the LF-3215 offers improved
coupling and keeps coverage angles wide over a greater frequency range than more widely
spaced designs.
The 300 watt, 15” transducers are well suited for cinema use. They feature 3” (76mm) voice
coils, 120 oz.(3.4kg) ceramic magnets, and vented pole pieces to ensure cool operation.
Cooler temperatures increase transducer lifespan and decrease the problem of power com-
pression at high power levels. The suspension and voice coil of each transducer have been
designed to provide low distortion and high impact bass at high power levels.
The enclosure is constructed of high quality medium density fiberboard panels with stiffen-
ing braces on all panels and features separate woofer chambers. This prevents over-excur-
sion of a transducer caused by improper box loading in the rare event of a transducer failure.
The eight stiffening braces reduce panel resonance.
Both internal and external port openings are fully radiused ensuring smooth air flow at high
power. This prevents audible port turbulence noise.
With symmetrical port loading, bass ports are evenly spaced on each side of the transduc-
ers, 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 forces, reduc-
ing the chance of driving the voice coil out of the center of the gap at high power levels.
Three T-nuts in the top of the enclosure provide easy mounting of QSC’s HF-63 high fre-
quency system, or MH-1063 mid-high frequency 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-000173-00 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 mid-
high or high frequency
system

Connections
Normal Connection
The LF-3215 has barrier strip screw termi-
nals for connection. The terminals accept
up to #10 AWG (5.3mm2) stranded loud-
speaker wiring. Use the largest wire size
and shortest wire length possible for the
application. Observe the polarity markings
and keep polarity consistent throughout
the system for best performance.
Parallel Connection of Second LF-3215
The terminals marker SPK2 may be used to
connect another LF-3215 in parallel. Con-
nect the wires as shown in the illustration,
at right. Note: If the LF-3215’s internal wir-
ing 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.
Individual Transducer Connection
(requires modification)
The transducers are wired in parallel
inside the enclosure. If individual trans-
ducer 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.
Normal Connection Example:
Parallel Connection Example:
Individual Transducer
Connection Example:
Amplifier capable of
driving 4 ohm loads
Amplifier capable of
driving 2 ohm loads
CAUTION! Requires
removal of terminal
cup and removing
both the yellow and
the blue jumper
wires that connect
the SPK1 and SPK2
terminals.

LF-3215 Specifications (subject to change without notice)
Frequency Range: 32 - 1500 Hertz (-6dB)
28 - 3300 Hertz useable range (-10dB)
Nominal Coverage: 100° horizontal X 55° vertical at 600 Hertz
Maximum Output:
132.5 dB SPL calculated peak, 1 meter, half space, at rated rms power with 6 dB crest factor pink noise input, 25 - 250 Hertz.
126.5 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 nominal
4.1 ohms minimum, 180 Hertz
55 ohms maximum, 21 Hertz
Maximum Input Power: 600 watts rms (8 hours of 6 dB crest factor pink noise, 40 - 400 Hertz)
750 watts rms (2 hours of 6 dB crest factor pink noise, 40 - 400 Hertz)
Recommended amplifier power capability- 1200 watts rms maximum into 4 ohms (per LF-3215)
Sensitivity: 98.5 dB half space, 97.5 dB 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 stranded wire. Four terminals: (two INPUT and two PARALLEL
OUT). Transducers 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 15” (381mm) high efficiency low frequency transducers featuring vented 3” (76mm) copper voice coils 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 35” high X 20” deep (762 mm X 889 mm X 508 mm)
Weight: 195 lbs. shipping, 172 lbs. net (88/78 kg.)
SPL and Impedance vs. Frequency
Frequency (Hertz)
SPL (dB)
Impedance (ohms)
SPL 2pi
Impedance
SPL 4pi

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:[email protected]
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.

Manual del usuario de los sistemas de altavoces para salas de cine
Altavoz de baja frecuencia LF-3215
Introducción
La caja doble de baja frecuencia de 15” (381 mm) del altavoz LF-3215 está diseñada especí-
ficamente para aplicaciones cinematográficas. El cumplimiento de los requisitos de las apli-
caciones cinematográficas referentes a una respuesta extendida de baja frecuencia, es lo
que distingue al altavoz LF-3215 de otros sistemas woofer tipo “rock-and-roll” más conven-
cionales. El altavoz LF-3215 cubre un intervalo de frecuencia de 32 Hertzios a 1500 Hertzios,
dependiendo de los requisitos del sistema de alta frecuencia. Con su espacio estrecho entre
los woofers, el LF-3215 ofrece un mejora en el acoplamiento y mantiene la amplitud de los
ángulos de cobertura sobre un mayor intervalo de frecuencia en comparación con diseños de
espacio más grande.
Los transductores de 300 vatios y 15” son apropiados para uso en salas de cine. Cuentan
con bobinas de voz de 3” (76 mm), imanes cerámicos de 120 onzas (3.4 kg) y polos multiven-
tilados para asegurar una operación fría. Las temperaturas más frías aumentan la vida útil
del transductor y disminuyen el problema de compresión de la potencia a niveles altos de
potencia. La suspensión y la bobina de voz de cada transductor se han diseñado para brindar
una baja distorsión y graves de alto impacto a altos niveles de potencia.
La caja está construida de paneles de cartón duro mediano de alta calidad con soportes de
refuerzo en todos los paneles, y cuenta con cámaras separadas para los woofers. Esto previ-
ene la excursión excesiva de un transductor causada por la carga inadecuada de la caja, en
el raro evento de falla del transductor. Los ocho soportes de refuerzo reducen la resonancia
en el panel.
Ambas aberturas del puerto, la interna y la externa, están totalmente redondeadas, asegu-
rando un flujo de aire uniforme a alta potencia. Esto evita ruido de turbulencia audible en el
puerto.
Con la carga simétrica de los puertos, los puertos de graves 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 fuerzas no equilibradas, reduciendo la probabilidad de impulsar la bobina de voz
fuera del centro del espacio 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-63 o del sistema de frecuencia media alta MH-1063, 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 sopo-
rtes 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 trans-
ductores, 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 con-
figuración. 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 sur-
jan dudas o preguntas referentes a la instalación física del equipo.
TD-000173-00 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
Puntos de montaje para el
sistema de alta frecuencia o el
sistema de frecuencia media
alta

Conexiones
Conexión normal
El altavoz LF-3215 tiene terminales de tor-
nillo de barra protectora para su conexión.
Los terminales aceptan cableado trenzado
de hasta #10 AWG (5.3 mm2) para altav-
oces. Use el alambre de calibre más
grande y de longitud más corta posible
para la aplicación. Observe las marcas de
polaridad y mantenga la polaridad uni-
forme en todo el sistema para permitir el
mejor rendimiento.
Conexión en paralelo de un segundo LF-
3215
Los terminales marcados SPK2 se pueden
usar para conectar en paralelo otro altavoz
LF-3215. Conecte los cables como se
muestra en la ilustración, a la derecha.
Nota: si el cableado interno de LF-3215 se
ha modificado de alguna manera, es
posible que no funcione. En este caso,
quite la cúpula del terminal y verifique la
presencia de alambres amarillos y azules
de puentes instalados en fábrica; corrija el
problema según se requiera, o solicite que
den servicio al altavoz.
Conexión del transductor individual
(requiere modificación)
Los transductores están conectados en
paralelo dentro de la caja. Si se requiere la
conexión del transductor individual, quite
la cúpula del terminal y quite los alambres
amarillo y azul del puente que están
conectados entre los terminales SPK1 y
SPK2. Vuelva a colocar la cúpula del termi-
nal y marque la caja con una nota que
indique la modificación.
Ejemplo de una conexión normal:
Ejemplo de conexión en paralelo:
Ejemplo de la conexión
de un transductor individual:
Amplificador con capacidad de accio-
namiento de cargas de 4 ohmios
Amplificador con capacidad de
accionamiento de cargas de 2 ohmios
¡PRECAUCIÓN!
Requiere desmontar
la cúpula del termi-
nal y los alambres
amarillo y azul que
conectan los termi-
nales SPK1 y SPK2.

Especificaciones del sistema LF-3215 (sujetas a cambio sin previo aviso)
Intervalo de frecuencias: 32 -1500 Hertzios (-6dB)
Intervalo utilizable de 28 -3300 Hertzios (-10 dB)
Cobertura nominal: 100° horizontal X 55° vertical a 600 Hertzios
Salida máxima:
Pico calculado de SPL: 132.5 dB, 1 metro, medio espacio, a una potencia rms nominal con entrada de ruido rosa con factor de
cresta de 6 dB, 25 - 250 Hertzios.
Máximo calculado continuo de SPL: 126.5 dBA, 1 metro. La escala de dBA típicamente se usa para identificar
fuentes de sonido que pueden causar pérdida auditiva permanente.
Impedancia: 4 ohmios, nominal
4.1 ohmios mínimo, 180 Hertzios
55 ohmios máximo, 21 Hertzios
Potencia máxima 600 vatios rms (8 horas de ruido rosa con factor de cresta de 6 dB, 40 -400 Hertzios)
de entrada: 750 vatios rms (2 horas de ruido rosa con factor de cresta de 6 dB, 40 -400 Hertzios)
Capacidad recomendada de potencia del amplificador: 1200 vatios rms como máximo en 4 ohmios (por LF-3215)
Sensibilidad: 98.5 dB medio espacio, 97.5 dB espacio completo, 35 - 1000 Hertzios, 1 vatio, 1 metro
Procesamiento Filtro subsónico menor de 30 Hertzios, >18 dB por octava, la frecuencia máxima de cruce recomendada es de
recomendado: 1000 Hertzios. Las configuraciones DSP de QSC están disponibles en www.qscaudio.com. Los parámetros para el
herraje de procesamiento alternativo están disponibles si así se solicitan.
Conectores: Los terminales de tornillo de barra protectora aceptan alambre trenzado de hasta #10 AWG . Cuatro terminales:
(dos de ENTRADA y dos de SALIDA PARALELA). Los transductores están cableados internamente en paralelo.
Para la conexión de un transductor independiente, quite los alambres azul y amarillo de los puentes que se
encuentran en el lado interno de la cúpula del terminal y marque la caja de acuerdo con esto.
Transductores: Dos transductores de baja frecuencia de alta eficiencia, de 15” (381 mm), con bobinas de voz de cobre de 3”
(76mm) ventiladas, en soportes de Kapton®. Diseño de alta excursión/baja deformación, con un manejo de
potencia extremadamente alta, y baja compresión térmica y de puerto.
Caja: Alineación Quasi B4, caja con puertos totalmente abocinados, diseño de puerto simétrico de baja turbulencia,
afinado a 36 Hertzios, construido de cartón duro de media densidad y fuertemente soportado. Tiene pernos de
montaje del woofer resistentes al vandalismo.
Tamaño: 30” de ancho X 35” de alto X 20” de profundidad (762 mm X 889 mm X 508 mm)
Peso: 195 libras envío, 172 libras neto (88/78 kg.)
SPL e impedancia en función de la frecuencia
Frecuencia (hertzios)
SPL (dB)
Impedancia (ohmios)
SPL 2pi
Impedancia
SPL 4pi

Garantía (sólo para EE.UU.; para otros países, consulte con su vendedor o distribuidor)
Renuncia de responsabilidad
QSC Audio Products, Inc. no es responsable por ningún daño a los amplificadores, ni a ningún otro equipo que sea causado por
negligencia o instalación y/o uso inadecuado de este altavoz.
Garantía limitada de 3 años de QSC Audio Products
QSC Audio Products, Inc. (“QSC”) garantiza que sus productos estarán libres de materiales y/o mano de obra defectuosos por
un periodo de tres (3) años a partir de la fecha de la venta, y reemplazará las piezas defectuosas y reparará los productos que
funcionen mal bajo esta garantía cuando el defecto ocurra bajo condiciones normales de instalación y uso, siempre y cuando
la unidad se devuelva a nuestra fábrica o a una de nuestras estaciones autorizadas de servicio mediante transportación prep-
agada con una copia del comprobante de compra (por ejemplo, el recibo de la compra). Esta garantía requiere que el examen
del producto devuelto indique, en nuestra opinión, un defecto de fabricación. Esta garantía no se extiende a ningún producto
que hubiera estado sometido a uso indebido, negligencia, accidente, instalación incorrecta, o en el que se hubiera quitado o
modificado el código de la fecha. QSC tampoco será responsable por daños incidentales y/o emergentes. Esta garantía le
otorga derechos legales específicos. Esta garantía limitada es libremente transferible durante el período de la misma.
El cliente podría gozar de derechos adicionales, que podrían variar de un estado a otro.
En caso de que este producto fuera fabricado para exportación y venta fuera de los Estados Unidos o sus territorios, entonces
no será aplicable esta garantía limitada. La eliminación del número de serie en este producto, o la compra de este producto de
un distribuidor no autorizado, anularán esta garantía limitada. Esta garantía se actualiza periódicamente. Para obtener la ver-
sión más reciente de la declaración de la garantía de QSC, por favor visite www.qscaudio.com. Comuníquese con nosotros al
800-854-4079 o visite nuestro sitio en Internet en www.qscaudio.com.
Cómo comunicarse con QSC Audio Products
Dirección postal:QSC Audio Products, Inc.
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 EE.UU.
Números de teléfono:
Número principal +1 (714) 754-6175
Ventas y comercialización +1 (714) 957-7100 o gratis (sólo EE.UU.) +1 (800) 854-4079
Servicio al cliente +1 (714) 957-7150 o gratis (sólo EE.UU.) +1 (800) 772-2834
Números de fax:
Fax de ventas y comercialización +1 (714) 754-6174
Fax de servicio al cliente +1 (714) 754-6173
World Wide Web:www.qscaudio.com
Correo electrónico:[email protected]
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 EE.UU.
©2004, “QSC” y el logo QSC están registrados con la Oficina de Patentes y Marcas Comerciales de EE.UU.
Kapton® es una marca comercial registrada de E.I. du Pont de Nemours and Company.

Manuel d'utilisation de systèmes de haut-parleurs de cinéma
Haut-parleur basse fréquence LF-3215
Introduction
L'enceinte basse fréquence double de 381 mm LF-3215 a été tout spécialement conçue pour
les applications en salle de cinéma. Les exigences des cinémas en matière de réponse
longue durée basse fréquence différencient le LF-3215 des systèmes de haut-parleurs de
graves « rock-and-roll » plus conventionnels. Le LF-3215 couvre la plage de fréquence de
32 à 1500 Hz, selon les exigences de haute fréquence du système. Avec peu d'espace entre
les haut-parleurs de graves, le LF-3215 améliore le couplage et permet des angles de
couverture larges sur une plus grande plage de fréquences que les modèles plus espacés.
Les transducteurs de 300 W et 38 cm sont bien adaptés à une utilisation dans les salles de
cinéma. Ils ont des bobines mobiles de 76 mm, des aimants en céramique de 3,4 kg et des
pôles à évents pour empêcher la surchauffe. Les températures inférieures augmentent la
durée de vie des transducteurs et diminuent le problème de compression de puissance à de
hauts niveaux de puissance. La suspension et la bobine mobile de chaque transducteur
visent à produire une faible distorsion et des graves à fort impact à haute puissance.
L'enceinte est faite de panneaux de fibres de densité moyenne et de haute qualité avec des
renforts sur tous les panneaux et elle a des caissons de graves distincts. Ce principe
empêche le dépassement de course d'un transducteur qui serait causé par le chargement
inadapté du boîtier dans l'éventualité rare d'une panne de transducteur. Les huit renforts
réduisent la résonance des panneaux.
Les ouvertures internes et externes des ports sont entièrement arrondies, garantissant la
circulation d'air uniforme à haute puissance, ce qui empêche les interférences sonores.
Grâce au chargement symétrique des ports (SPL), les ports à basses sont équidistants de
part et d'autre des transducteurs, ce qui répartit uniformément la pression interne à travers
la surface arrière du transducteur. Ceci empêche le déplacement du cône d'un côté ou de
l'autre par des forces déséquilibrées, ce qui réduit le risque d'excentrage de la bobine
mobile à haute puissance.
Trois écrous en T sur le dessus de l'enceinte facilitent la fixation du système haute
fréquence HF-63 ou du système sonore de hauteur moyenne MH-1063 de QSC.
L'enceinte n'a pas été conçue pour être suspendue, balancée ou montée. La
suspension, le balancement ou le montage de l'enceinte sont interdits.
Ce produit est capable de produire des niveaux de pression sonore
susceptibles d'endommager l'ouïe de manière irréversible. Toujours maintenir
les niveaux de pression sonore dans la zone d'écoute en deçà de niveaux
susceptibles de compromettre l'ouïe.
Installer conformément aux instructions de QSC Audio Products et d'un
technicien professionnel diplômé. Utiliser uniquement des fixations, supports,
accessoires ou équerres spécifiés par QSC Audio Products. Confier toutes les
réparations à un personnel qualifié. Une réparation ou maintenance est requise
lorsque l'appareil a été endommagé d'une manière quelconque.
AVERTISSEMENT ! Avant de placer, installer, monter ou suspendre un haut-
parleur, inspecter l'état de toute la visserie, du matériel de suspension, des
armoires, des transducteurs, des supports et du matériel associé. Tout
composant manquant, corrodé, déformé ou non adapté à la charge risque de
réduire sensiblement la solidité de l'installation, sa mise en place ou sa portée.
Une telle condition réduit sensiblement la sécurité de l'installation et doit être
immédiatement corrigée. Utiliser uniquement du matériel de montage prévu
pour les conditions de charge de l'installation et toute surcharge éventuelle à
court terme imprévue. Ne jamais dépasser les spécifications nominales du
matériel de montage ou de l'équipement. Consulter un technicien
professionnel diplômé en cas de doute ou de question concernant l'installation
physique de l'équipement.
TD-000173-00 rév. C
© Copyright 2004, QSC Audio Products, Inc.
QSC® est une marque déposée de QSC Audio Products, Inc.
QSC et le logo QSC sont des marques déposées auprès de l'U.S. Patent and
Trademark Office.
1675 MacArthur Blvd., Costa Mesa, CA 92626
Téléphone (standard) +1 (714) 754-6175 Ventes et Marketing +1 (714) 957-7100
ou +1 (800) 854-4079 (numéro vert valable aux États-Unis seulement)
Service clientèle +1 (714) 957-7150 ou numéro vert (États-Unis seulement) +1 (800) 772-2834
Points de fixation d'un système
haute fréquence ou de hauteur
moyenne

Branchements
Branchement normal
Le branchement du LF-3215 se fait à partir
de bornes vissables de bornier à cloisons.
Les bornes acceptent des câbles de haut-
parleurs toronnés pouvant atteindre
#10 AWG (5,3 mm2). Utiliser des
conducteurs de calibre maximal et de
longueur minimale pour l'application.
Observer les repères de polarité et
maintenir une polarité constante à travers
le système pour une meilleure
performance.
Branchement en parallèle d'un second
LF-3215
Le marqueur de bornes SPK2 peut servir au
branchement d'un autre LF-3215 en
parallèle. Brancher les conducteurs
comme indiqué sur l'illustration, à droite.
Remarque : Si le câblage interne du
LF-3215 a été modifié d'une manière
quelconque, il est possible que ce
branchement ne donne aucun résultat.
Dans ce cas, retirer la cupule de la borne
et vérifier la présence des connexions
temporaires jaune et bleue ; corriger le
problème ou faire réparer le haut-parleur.
Branchement individuel des
transducteurs (modificationobligatoire)
Les transducteurs sont câblés en parallèle
à l'intérieur de l'enceinte. Si un
branchement individuel est requis, retirer
la cupule de la borne et retirer les
connexions temporaires jaune et bleue
entre les bornes SPK1 et SPK2. Remettre
la cupule sur la borne et apposer sur
l'enceinte une note indiquant la
modification.
Exemple de branchement
Exemple de branchement en
Transducteur individuel
Exemple de branchement :
Amplificateur capable
de piloter des charges
de 4 ohms
Amplificateur capable de
piloter des charges de 2 ohms
ATTENTION ! Exige
le retrait de la cupule
sur la borne et la
coupe des
connexions
temporaires jaune et
bleu entre les bornes
SPK1 et SPK2.
normal :
parallèle :

Caractéristiques techniques du LF-3215 (sujettes à modification sans préavis)
Plage de fréquence : 32 à 1 500 Hz (-6 dB)
28 à 3 300 Hz (plage utile) (-10 dB)
Couverture nominale : 100° horizontal x 55° vertical à 600 Hz
Sortie maximale :
Niveau de pression sonore maximal calculé de 132,5 dB, à 1 m, demi-espacement, à la puissance nominale efficace avec 6 dB entrée de
bruit rose de facteur de crête, 25 à 250 Hz.
Niveau de pression sonore maximal calculé continu de 126,5 dBA, à 1 m. L'échelle de dBA sert généralement à identifier les
sources sonores susceptibles de causer une surdité permanente.
Impédance : 4 ohms, nominale
4,1 ohms minimale, 160 Hz
55 ohms maximale, 21 Hz
Puissance d'entrée maximale : 600 W (efficace) (8 heures de bruit rose de facteur de crête 6 dB, 40 à 400 Hz)
750 W (efficace) (2 heures de bruit rose de facteur de crête 6 dB, 40 à 400 Hz)
Capacité de puissance d'amplificateur recommandée - 1 200 W (efficace) maximum dans 4 ohms (conformément au modèle
LF-3215)
Sensibilité : 98,5 dB demi-espacement, 97,5 dB espacement total, 35 à 1000 Hz, 1 W, 1 m
Traitement recommandé : Filtre subsonique inférieur à 30 Hz, >18 dB par octave ; fréquence de filtre passif maximale recommandée : 1 000 Hz. Les
configurations des processeurs de champs sonores numériques QSC sont disponibles sur le site www.qscaudio.com. Les
paramètres concernant d'autres matériels de traitement sont disponibles sur demande.
Connecteurs : Les bornes acceptent des câbles de haut-parleurs toronnés pouvant atteindre #10 AWG. Quatre bornes : (deux d'entrée et
deux de sortie parallèle). Les transducteurs sont câblés à l'intérieur en parallèle. Pour le branchement indépendant d'un
transducteur, retirer la connexion temporaire bleue et la connexion temporaire jaune de l'intérieur de la cupule de borne et
laisser une note sur l'enceinte signalant cette modification.
Transducteurs : Deux transducteurs basse fréquence ultra-efficaces de 381 mm avec bobines mobiles en cuivre de 76 mm à évents sur
formes Kapton®. Conception du type excursion élevée/faible distorsion, qui permet le traitement d'une puissance
extrêmement élevée, et réduit la chauffe et la compression des ports.
Enceinte : Enceinte résonnante à alignement quasi B4 avec ports entièrement arrondis ; conception symétrique des ports à faible
turbulence ; réglée à 36 Hz, en panneaux de fibres de densité moyenne et fortement renforcé. Possède des boulons de
fixation sur les haut-parleurs de graves résistants aux vandales.
Dimensions : 762 mm (largeur) x 889 mm (hauteur) x 508 mm (épaisseur)
Poids brut : 88 kg Poids net : 78 kg
SPL et impédance par rapport à la fréquence
Fréquence (Hz)
SPL (dB)
Impédance (ohms)
SPL 2pi
Impédance
SPL 4pi

Garantie (États-Unis seulement ; dans les autres pays, consulter le revendeur ou le distributeur)
Avis de non-responsabilité
QSC Audio Products, Inc. n'est pas responsable des dommages subis par les amplificateurs ou tout autre équipement causé
par un acte de négligence ou une installation impropre et/ou l'utilisation de ce haut-parleur.
QSC Audio Products - Garantie limitée de 3 ans
QSC Audio Products, Inc. (« QSC ») garantit que ses produits sont dépourvus de tout vice de fabrication et/ou de matériel
pendant une période de trois (3) ans à partir de la date de vente et remplacera les pièces défectueuses et réparera les produits
qui fonctionnent mal dans le cadre de cette garantie si le défaut survient dans des conditions normales d'installation et
d'utilisation - à condition que l'appareil soit retourné à l'usine ou à l'un de nos centres de réparation agréés en port prépayé,
accompagné d'un justificatif d'achat (facture, par ex.). Cette garantie prévoit que l'examen du produit retourné doit indiquer,
selon notre jugement, un défaut de fabrication. Cette garantie ne s'étend à aucun produit qui a été soumis à une utilisation
abusive, un acte de négligence, un accident, une installation incorrecte ou un produit dont le code-date a été retiré ou effacé.
QSC ne pourra être tenue pour responsable de dommages accessoires et/ou indirects. Cette garantie vous accorde des droits
spécifiques. Cette garantie limitée est librement cessible durant sa période de validité.
Le client pourra bénéficier d'autres droits, variables d'une juridiction à l'autre.
Si ce produit a été fabriqué pour une exportation et une vente en dehors des États-Unis ou de ses territoires, cette garantie
limitée ne s'appliquera pas. Le retrait du numéro de série sur ce produit ou l'achat de ce produit auprès d'un revendeur non
agréé annulera cette garantie limitée. Cette garantie est régulièrement mise à jour. Pour obtenir la toute dernière version de la
garantie de QSC, rendez-vous sur le site www.qscaudio.com. Contactez-nous au 800-854-4079 ou visitez notre site Web
www.qscaudio.com.
Pour contacter QSC Audio Products
Adresse postale :QSC Audio Products, Inc.
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468, États-Unis
Téléphone :
Standard +1 (714) 754-6175
Ventes & Marketing +1 (714) 957-7100 ou numéro vert (États-Unis seulement) +1 (800) 854-4079
Service clientèle +1 (714) 957-7150 ou numéro vert (États-Unis seulement) +1 (800) 772-2834
Télécopieur :
Ventes & Marketing Télécopieur +1 (714) 754-6174
Service clientèle Télécopieur +1 (714) 754-6173
Site Web :www.qscaudio.com
E-mail :[email protected]
QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, California 92626 USA
©2004 QSC et le logo QSC sont des marques déposées auprès de l'U.S. Patent and Trademark Office.
Kapton® est une marque déposée de E.I. du Pont de Nemours and Company.
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