QSC GX7 User manual

TM

GX POWER AMPLIFIER SERIES

User Manual

GX3 300 watts per channel at 8 ohms
GX5 500 watts per channel at 8 ohms
GX7 725 watts per channel at 8 ohms

EN

TD-000271-00-F

*TD-000271-00*

IMPORTANT SAFETY PRECAUTIONS AND EXPLANATION OF SYMBOLS

1- Read these instructions.
2- Keep these instructions.
3- Heed all warnings.
4- Follow all instructions.
5- WARNING: To prevent fi re or electric shock, do not expose this equipment to rain or moisture. Do not use this apparatus near water.
6- Clean only with a dry cloth.
7- Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifi ers) that produce heat.
9- The appliance coupler is the AC mains disconnect and should remain readily operable after installation.
10- Do not defeat the safety purpose of the grounding-type plug. A grounding plug has two blades and a grounding prong. The wide blade or third

EN

prong are provided for your safety. If the provided plug does not fi t your outlet, consult an electrician for the replacement of the obsolete outlet.
This apparatus should be connected to a receptacle with a protective earthing (or ground) connection.

11- Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the

apparatus.
12- Use only attachments/accessories specifi ed by QSC Audio Products, LLC
13- Use only with hardware, brackets, stands, and components sold with the apparatus or by QSC Audio Products, LLC
14- Unplug the apparatus during lightning storms or when unused for long periods of time.
15- Refer all servicing to qualifi ed service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply

cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture,

does not operate normally, or has been dropped.

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The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance

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FCC INTERFERENCE STATEMENT
NOTE: This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. These
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and if not installed and used in accordance to the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by switching the equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio or TV technician for help.

(servicing) instructions in this manual.

The lightning fl ash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated
“dangerous” voltage within the product’s enclosure that may be of suffi cient magnitude to constitute a risk of electric shock
to humans.

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.

WARNING: To prevent fi re or electric shock, do not expose this equipment to rain or moisture.

© Copyright 2010, QSC Audio Products, LLC

QSC® is a registered trademark of QSC Audio Products, LLC

“QSC” and the QSC logo are registered with the U.S. Patent and Trademark Offi ce

All trademarks are the property of Speakon® and PowerCon® are registered trademarks of Neutrik LLC their respective owners.

WELCOME

Thank you for purchasing a QSC Audio amplifi er. The GX Series is
the latest in a long line of hard-working, low cost amplifi ers, designed
to produce the best possible results for a wide range of users. In
most cases, you can plug and play with no surprises, but for best
results, we recommend you review the enclosed user guide.

3

GX POWER AMPLIFIER SERIES

Professional Power Amplifi ers

UNPACKING

Confi rm that the amplifi er has no visible shipping damage. Confi rm
that amplifi er has the correct AC cord and voltage rating for your
region (See rear panel, Serial Number plate). It is best to keep the
carton in case the amplifi er needs to be returned, at least until it has
been tested.

SUPPORT AND SERVICE

QSC Audio Products maintains a world-wide network of distributors
and service centers. These local agencies will be able to answer your

questions and take care of any problems.

QSC WEBSITE

Our website, www.qscaudio.com, is factory-maintained and
supported in multiple languages. Visit frequently for new
announcements, typical questions, and other user information.

IMPORTANT SAFETY PRECAUTIONS

QSC products are designed for safe operation, and have been
certifi ed by recognized product safety agencies to meet all normal
standards for this type of product. However, dangerous voltages
and power levels exist within the covers of this amplifi er. The user
is requested to study the precautions in this manual. If the product
has been dropped, dented, soaked, or appears to have loose parts
inside, the risk of shock is increased. Unplug the AC cord, and take
the product to qualifi ed service personnel for inspection and repairs.

POWER RATINGS

Watts at 0.1% clipping, both channels driven

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FEATURES

Power levels matched to the most popular speakers used by
entertainers.

Optimized for maximum real-world headroom into 4Ω and 8Ω
speaker systems.

Inputs: XLR, 1/4” TRS and phono input connectors for
compatibility with any source.

Outputs: Speakon® combo accepts 1/4” (TS) plugs or Speakon
2-pole and 4-pole plugs (connects 2 poles only). Binding posts
support all other speaker wiring systems.

Minimum depth chassis (only 10.1” / 257 mm) fi ts in compact,
inexpensive effects racks.

Light weight – less than 26 lbs (12.5 kg).

Detented gain controls for precise setting and matching of
sensitivity.

GuardRail automatically protects the amplifi er and loudspeakers
from damage due to temperature rise or overdrive without
shutting down the show.

Front panel LEDs monitor Power, Signal and Clipping.

Model
GX3 300 425 200
GX5 500 700 350
GX7 725 1000 600

*NOTE: 2-ohm loading is not recommended for high power use.
To avoid protective limiting, use only at low levels.

8 ohms 4 ohms 2 ohms*

Subwoofer / Satellite crossover built-in.

FRONT PANEL FEATURES

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ON-OFF SWITCH

Move the rocker switch up to turn on the amplifi er.
The blue PWR LED will turn on immediately.
The red CLIP LEDs may trigger for 1-2 seconds until the amp
has completed its turn-on cycle. If no lights come on, check the
power cord and the AC reset on the rear panel.

COOLING VENTS

The internal fan moves air through the chassis to
reduce temperature rise. Keep vents clear. The fan
speeds up in response to heavy use.

4

MODEL NUMBER

The GX3, GX5, and GX7
power ratings are shown on
the Specifi cations page.

inches (cm)

GAIN CONTROLS, CH1, CH2

The markings show attenuation in dB. For normal

use, keep the control in the upper half of its range

(less than 10 dB of attenuation). If set below half,

the source may overload before the amplifi er

reaches full power.

5

RACK MOUNTING

Fits standard 19-inch rack, 2RU.
Accepts #10 or 6 mm screws,
as determined by the rack rails.
Add rear support to prevent
damage in portable rigs.

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RED CLIP LEDS

Red fl ashing indicates the amp is being overdriven. Heavy overdrive triggers internal gain
reduction, to reduce overload distortion. Normal gain will resume after the signal level returns to
normal. See Troubleshooting if the red LED remains on continuously.

GREEN SIGNAL LEDS

The green LED starts fl ashing on soft signals (-35 dB), and changes to steady green as the
signal level increases.

BLUE POWER LED

The blue PWR (POWER) LED indicates that the AC switch is on, and the amp is receiving
power. Within two seconds, it is ready to use.

ALTERNATE GAIN MARKING

When the CROSSOVER switch is active (see rear panel),
LF (CH 1) controls low frequencies (subwoofer),
HF (CH 2) controls the high frequencies (mid-high box).

REAR PANEL FEATURES

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CROSSOVER SWITCH

CROSSOVER POSITION

Splits a full-range signal to drive a subwoofer and top box.
CH 1 receives the lows, from 20-100Hz, for the subwoofer.
CH 2 receives 100Hz to 20kHz, to power a full range speaker.
When using CROSSOVER mode, connect signal to CH 1 only.
Use the two Gain controls to balance the LF and HF signals
(see Front Panel).

FULL RANGE POSITION

For normal, 2-channel use with all inputs active.
The crossover is bypassed.

EXHAUST VENT

Keep vent clear. Install in
open-back rack.

REAR EAR MOUNTING

Rear ears designed for protecting the
rear connector wire dressing and
supporting the amplifi er in a rack. A rear
rack support mounting kit (model FG­000031-00 pack of two) is available from
QSC Technical Services Group.

INPUT CONNECTIONS

BALANCED XLR INPUTS

Pin 2 Positive, Pin 3 Negative, Pin 1 Shield (Ground).
Recommended for long or short runs, either fi xed or
frequently changed. Each channel’s XLR and TRS jacks
are connected internally, and provide feed thru
to the other connector.

BALANCED 1/4-INCH TRS INPUTS

Tip positive, Ring Negative, Sleeve Shield (Ground).
Recommended for long or short runs that are frequently
changed.

UNBALANCED 1/4-INCH TS INPUTS

Accepts unbalanced 1/4-inch plugs for short runs.
Tip positive, Sleeve Shield (Ground).

UNBALANCED PHONO INPUTS

Tip Positive, Barrel Shield (Ground). Recommended
for semi-permanent connections to nearby sources,
within the same rack. NOTE: when using these
inputs, the TRS or XLR inputs should not be used.

AC BREAKER RESET

If the amplifi er shuts off after a long burst of power,
turn off the AC switch and check the circuit breaker.
The button can be pressed back in after a 30 second
cool-down period. If the breaker trips repeatedly,
the amplifi er may need servicing.

SERIAL NUMBER AND RATINGS

The rated AC voltage and output power
is shown on the serial number plate.
Record the serial number in a safe place.

7

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SPEAKER CONNECTIONS

BINDING POSTS

Accepts banana plugs
(not permitted in CE regions).
Bare wires or terminals may be
inserted into the side holes.

1/4-INCH CONNECTORS

Insert plug into the center of
the Speakon-Combo jack.
Use only heavy duty speaker cables.

SPEAKON CABLES (2 wire type):

Insert and turn until the connector clicks.
Use the thumb latch or locking ring
to release the plug.

AC INLET

SYSTEM HOOKUP EXAMPLES

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SYSTEM HOOKUP EXAMPLES

9

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TRS

TROUBLESHOOTING

TROUBLESHOOTING

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NO POWER, NO LIGHTS, NO FAN

Confi rm that the AC cord is fully seated and connected to a
live outlet. Check the AC source by trying another device
such as a lamp. Check the BREAKER on the back of the
amplifi er by pushing in the button. If the breaker trips off
quickly, the amplifi er needs servicing.

AMPLIFIER LOSES VOLUME

If the amplifi er is worked too hard, GuardRail™ will
reduce volume to prevent thermal muting. The fan should be
running at full speed. Reduce input signal somewhat and the
amp should return to normal gain within 1-2 minutes. If the
amp feels hot and the fan is not running, it needs to be
serviced.

EN

CHANNEL 1 PRODUCES DEEP BASS ONLY.

Check the position of the CROSSOVER switch on the rear
panel. Set on FULL RANGE for normal, independent use of
each channel.

CHANNEL 2 INPUT SEEMS DEAD.

Check the position of the CROSSOVER switch on the rear
panel. Set on FULL RANGE for normal, independent use of
each channel.

AMPLIFIER SOUNDS DISTORTED.

If the red CLIP LED is fl ashing, the amplifi er is being played
beyond its normal rated power. GuardRail™ circuitry will reduce
volume somewhat to prevent severe overdrive, but if the input
signal is further increased, the limiter can be overridden, with
increased distortion.

If the speakers or speaker cables are shorted or defective,
the amplifi er may distort at lower-than-normal levels, with
increased fl ashing of the red CLIP LED. This should be
checked by trying an alternate speaker and cable.

NO SOUND, WITH BLUE LED ONLY, NO GREEN OR
RED LED

Confi rm that the Gain controls are turned up. Confi rm that
the input cables are correctly installed at both ends. If using
1/4-inch speaker cables, do not confuse with input cables.
Confi rm that the source is active. If necessary, try another
source, or connect another amplifi er to the existing source.

NO SOUND, BUT THE GREEN LED IS RESPONDING

The green LED indicates the amp is producing a signal, so
sound should be heard if the speaker is connected. Check
the speaker connections at both ends, and try a different
speaker.

NO SOUND, RED LED ON

The amp mutes briefl y when turned on and off to prevent
thumps. If the amp overheats severely, it will mute until it cools off.
The fan will be running at full speed, and sound should
resume in less than a minute. If the amp feels hot and the fan
is not running, it needs to be serviced.

BACKGROUND HUM

Balanced XLR or TRS cables are better for long runs. Hum can be a
problem when connecting to TV-cable rigs, since the TV cable often
creates a ground confl ict. Request or install a TV-cable isolator to
reduce this problem.

Hum can also occur earlier in the signal chain, depending on the
types of connections. It often helps to plug everything into the same
AC strip, if the total power consumption is not excessive.

As a last resort, mild hum can sometimes be reduced by
lowering the amp gain, and increasing the source gain to
compensate, but you must ensure that the source can deliver
the extra volume without overload distortion. If this does not
reduce hum, it is coming from the source.

If too many speakers are connected to each channel
(impedance below 4 ohms), the amp will overload more
easily and will probably run hot.

If the sound is distorted or garbled without fl ashing the red
CLIP LED, the distortion is not occurring inside the amplifi er.
Either the speaker is bad or the input signal is distorted.

• Confi rm that the speaker is OK by trying a different unit.

• Input overload can occur if the amplifi er Gain controls are set too
low, and the input source is overdriven to compensate Reduce the
source volume until the distortion clears up, and increase amp Gain
to reach the desired level. It is generally desireable to keep the
amp gains at or near their full, clockwise, position.

• Check all input connections. Do not plug two different sources into
the same channel. Use a mixer to blend sources.

AMPLIFIER NEEDS SERVICING

The following conditions indicate possible unsafe conditions
that require service before using. If observed, unplug the AC
cord from the wall and when safe, remove the amp for
servicing.

• If the amplifi er emits smoke or burning smells

• If the case is severely dented or deformed

• If the amplifi er is soaked with any fl uid

• If internal parts sound loose

• If the AC breaker trips when power is applied

• If the amplifi er is dropped, carefully inspect for damage or
loose parts before attempting to use.

SPECIFICATIONS

SPECIFICATIONS

GX3 GX5 GX7

SPECIFICATION SUBJECT TO CHANGE WITHOUT NOTICE.

OUTPUT POWER, 1 kHz, 0.1 % clipping

8Ω, both channels driven 300 W 500 W 725W

8Ω, single channel driven 350 W 600 W 800W

4Ω, both channels driven 425 W 700 W 1000W

4Ω, single channel driven 500 W 850 W 1200W

2Ω, both channels driven, 1% clipping 200 W 350 W 600W

SIGNAL TO NOISE (20 Hz – 20 kHz) 100 dB

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INPUT SENSITIVITY 1.2 Vrms

VOLTAGE GAIN AT 8Ω 32.2 dB 34.4 dB 36.1 dB

OUTPUT CIRCUITRY Class B 2-tier Class H 2-tier Class H

POWER REQUIREMENTS (1/8 power, pink noise 6.3 A 6 A 10.1 A
at 4Ω 120 V AC)

DISTORTION (1 dB below rated power, 1 kHz) 8Ω, less than 0.02%
4Ω, less than 0.05%

FREQUENCY RESPONSE 20 – 20kHz, +0, -1dB

DYNAMIC HEADROOM, 4Ω 2dB

INPUT IMPEDANCE Greater than 20K ohms (balanced or unbalanced)

MAXIMUM INPUT LEVEL +24 dB (16 Vrms)

INPUT CONNECTORS, each channel 3-pin XLR and 1/4” TRS, balanced, parallel
Phono, unbalanced

OUTPUT CONNECTORS, each channel Speakon®, 1/4”, Binding Posts

AMPLIFIER AND LOAD PROTECTION Short circuit, open circuit, thermal, RF protection
Load protected against DC faults

CONTROLS AND INDICATORS, FRONT PANEL Gain controls, 21 detents
Red Clip LEDs, proportional, 0.1% THD threshold.
Green Signal LEDs, threshold -35 dB
Blue Power LED, AC-on.

CONTROLS, REAR PANEL Full Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top).

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DIMENSIONS (HWD) 3.5” (2RU) x 19” x 10.1” (89 mm x 483 mm x 257 mm)

WEIGHT – Shipping / Net 31 / 27 lbs (14.1 / 12.1 kg) 32 / 28 lbs (14.6 / 12.6 kg) 22 / 17 lbs (10 / 7.7 kg)

AGENCY APPROVALS UL, CE, RoHS / WEEE compliant. Meets FCC Class B EMI limits.

AC POWER CONSUMPTION 1/8 power, ohms (AC Current and Heating, 120Vac)

GX3 GX5 GX7
Operating Condition AC amps BTU / hr AC amps BTU / hr AC amps BTU / hr
Idle 0.2 44 0.3 60
8 + 8 ohms, 1/8 power (1) 4.1 904 3.3 734 7.6 1183
8 + 8 ohms, 1/3 power (2) 6.1 1160 8.5 1456 13.4 1807
8 + 8 ohms, full power (3) 9.75 1109 16.2 1891 26.5 2167
4 + 4 ohms, 1/8 power (1) 6.3 1515 5.8 1160 11.5 1908
4 + 4 ohms, 1/3 power (2) 9.4 2105 11.2 2162 18.5 2612
4 + 4 ohms, full power (3) 15.0 2297 24.5 3754 39.4 4478

(1) 1/8 power represents typical operating conditions.
(3) Full power is breaker limited to short periods.

(2) 1/3 power represents peak program levels.
(4) For 230V, multiply AC current by 0.5. For 100V, multiply AC current by 1.25.

0.6 82

WARRANTY

(USA only; other countries, see your dealer or distributor)

Disclaimer
QSC Audio Products, LLC is not liable for any damage to amplifi ers 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, LLC ( 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 prepaid 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.

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QSC shall not be liable for incidental and/or consequential damages. This warranty gives you specifi c 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.

How to Contact QSC Audio Products

Mailing address:
QSC Audio Products, LLC
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 [phone] 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]

TM

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

©2007 “QSC” and the QSC logo are registered with the U.S. Patent and Trademark Offi ce.

TM

SERIE DE AMPLIFICADORES DE POTENCIA GX

Manual del usuario

GX3 300 vatios por canal a 8 ohmios
GX5 500 vatios por canal a 8 ohmios
GX7 725 vatios por canal a 8 ohmios

SP

TD-000271-00-F

*TD-000271-00*

IMPORTANTES PRECAUCIONES DE SEGURIDAD Y EXPLICACIÓN DE LOS SÍMBOLOS

1- Lea estas instrucciones.
2- Conserve estas instrucciones.
3- Observe todas las advertencias.
4- Siga todas las instrucciones.
5- ADVERTENCIA: Para prevenir incendios o descargas eléctricas, no exponga este equipo a la lluvia ni a la humedad.
No use este aparato cerca del agua.
6- Límpielo sólo con un paño seco.
7- No obstruya ninguna abertura de ventilación. Instale de acuerdo con las instrucciones del fabricante.
8- No lo instale cerca de fuentes de calor tales como radiadores, registros térmicos, estufas ni otros aparatos (inclusive amplifi cadores) que

produzcan calor.

9- El acoplador del equipo es la desconexión de la línea principal de CA y debe permanecer fácilmente operable después de la instalación.

SP

10- No anule la característica de seguridad del enchufe con conexión a tierra. Un enchufe con conexión a tierra tiene dos hojas y una patilla de

conexión a tierra. La hoja ancha o el tercer terminal se proporcionan para su seguridad. Si el enchufe que se le proporciona no cabe en su
tomacorriente, consulte con un electricista para reemplazar el tomacorriente obsoleto. Este aparato debe estar conectado a un receptáculo con
una conexión de protección a masa (o tierra).

11- Proteja el cable de alimentación para que no se camine sobre él ni se le comprima, particularmente en los enchufes, los receptáculos y el punto

en donde éstos salen del aparato.
12- Use sólo piezas/accesorios especifi cados por QSC Audio Products, LLC
13- Use sólo con herraje, soportes, estantes y componentes vendidos con el aparato o por QSC Audio Products, LLC
14- Desenchufe el aparato durante tormentas eléctricas o cuando no lo vaya a usar durante periodos prolongados de tiempo.
15- Refi era todo el servicio a personal califi cado. Es necesario dar servicio al aparato cuando sufra algún daño, como cuando se daña el cable de

alimentación eléctrica o el enchufe, cuando se derraman líquidos o caen objetos sobre el aparato, cuando éste ha estado expuesto a la lluvia o
humedad, cuando no opere normalmente o cuando se haya caído.

14

!

DECLARACIÓN DE LA FCC RESPECTO A LA INTERFERENCIA
NOTA: Este equipo ha sido probado y se ha determinado que cumple con los límites de un dispositivo digital Clase B, en virtud de la parte 15 de las

reglas de la FCC. Estos límites están diseñados para proporcionar protección razonable contra interferencia dañina en una instalación residencial. Este
equipo genera, usa y puede irradiar energía de radiofrecuencia, y si no se instala y usa de acuerdo con las instrucciones, puede causar interferencia
dañina a las comunicaciones de radio. Sin embargo, no hay garantía que no ocurrirá interferencia en una instalación en particular. Si este equipo causa
interferencia dañina a la recepción de radio o televisión, lo cual se puede determinar al apagar y encender el equipo, se recomienda al usuario que trate
de corregir la interferencia en una o más de las siguientes maneras:
Reoriente o reubique la antena receptora.
Aumente la separación entre el equipo y el receptor.
Conecte el equipo en un tomacorriente de un circuito diferente al cual está conectado el receptor.
Consulte al distribuidor o a un técnico experimentado de radio o TV para solicitar ayuda.

El signo de exclamación dentro de un triángulo equilátero tiene la intención de alertar al usuario de la presencia de importantes instrucciones de
operación y mantenimiento (servicio) en este manual.

El símbolo del rayo con una punta de fl echa dentro de un triángulo equilátero tiene la intención de alertar al usuario de la presencia de voltaje
“peligroso” no aislado dentro de la caja del producto, que puede ser de magnitud sufi ciente para constituir un riesgo de descarga eléctrica
para los seres humanos.

PRECAUCIÓN: PARA REDUCIR EL RIESGO DE DESCARGA ELÉCTRICA, NO QUITE LA CUBIERTA. EL INTERIOR NO CONTIENE PIEZAS A
LAS
QUE EL USUARIO PUEDA DAR SERVICIO. REFIERA EL SERVICIO A PERSONAL CALIFICADO.

ADVERTENCIA: Para prevenir incendios o descargas eléctricas, no exponga este equipo a la lluvia ni a la humedad.

© Copyright 2010, QSC Audio Products, LLC

QSC® es una marca comercial registrada de QSC Audio Products, LLC

“QSC” y el logotipo de QSC están registrados con la Ofi cina de Patentes y Marcas Comerciales de los Estados Unidos

Speakon® y PowerCon® son marcas registradas de Neutrik LLC y sus respectivos propietarios. Todas las marcas comerciales

registradas son propiedad de sus respectivos dueños.

SERIE DE AMPLIFICADORES DE POTENCIA GX

BIENVENIDO

Gracias por adquirir un amplifi cador de QSC Audio. La serie GX es
la última de una larga línea de amplifi cadores resistentes y de bajo
costo, diseñados para producir los mejores resultados a una gran
variedad de usuarios. En la mayoría de los casos, puede enchufar
y reproducir sin sorpresas, pero para obtener resultados óptimos,
recomendamos que revise la guía del usuario adjunta.

DESEMBALAJE

Confi rme que el amplifi cador no haya sufrido daños visibles durante
el envío. Confi rme que el amplifi cador tenga el cable de CA y la
clasifi cación de voltaje correctos para su región (consulte la placa
con el número de serie en el panel posterior). Es buena idea guardar
la caja en el caso de que sea necesario devolver el amplifi cador, al
menos hasta el momento de haberlo probado.

ASISTENCIA Y SERVICIO TÉCNICO

QSC Audio Products mantiene una red internacional de
distribuidores y centros de servicio. Estas agencias locales podrán

responder sus preguntas y solucionar cualquier problema.

15

Amplifi cadores profesionales de potencia

SP

CARACTERÍSTICAS

Niveles de potencia equiparados a los altavoces más populares
usados por los artistas.

Optimizado para un máximo espacio libre del mundo real en
sistemas de altavoces de 4Ω y 8Ω.

do

SITIO WEB DE QSC

Nuestro sitio web, www.qscaudio.com, se mantiene en la fábrica y
está disponible en varios idiomas. Visítelo frecuentemente para leer
los anuncios nuevos, ver las preguntas típicas y enterarse de otra
información para el usuario.

PRECAUCIONES IMPORTANTES DE
SEGURIDAD

Los productos de QSC están diseñados para su operación segura, y
agencias reconocidas de seguridad de los productos certifi can que
cumplen con todas normas habituales para este tipo de producto.
Sin embargo, dentro de este amplifi cador existen voltajes peligrosos
y niveles de potencia. Se solicita al usuario leer las precauciones en
este manual. Si el producto se ha caído, abollado, mojado o parece
tener piezas sueltas en su interior, se aumentará el riesgo de sufrir
descargas eléctricas. Desenchufe el cable de CA y lleve el producto
al personal de servicio califi cado para su inspección y reparaciones.

CLASIFICACIONES DE POTENCIA

Vatios a un recorte del 0.1%, ambos canales excitados

Modelo 8 ohmios 4 ohmios 2 ohmios*
GX3 300 425 200
GX5 500 700 350
GX7 725 1000 600

Entradas: Conectores XLR, TRS de 1/4” y de entrada de sonido
compatibles con cualquier fuente.

Salidas: La combinación Speakon® acepta enchufes de 1/4”
(TS) o enchufes Speakon de 2 polos y de 4 polos (sólo conecta
2 polos). Los bornes de conexión aceptan todos los demás
sistemas de cableado de altavoces.

El chasis de profundidad mínima (sólo 10.1” / 257 mm) cabe
en bastidores para equipo de efectos, que son compactos y
económicos.

Liviano – menos de 26 lbs (12.5 kg).

Controles de ganancia con retenes para ajustar y equiparar la
sensibilidad.

GuardRail automáticamente protege el amplifi cador y los
altavoces contra daños debido al aumento de la temperatura o a
la sobreexcitación sin interrumpir el espectáculo.

Los indicadores LED del panel frontal supervisan la potencia, la
señal y el recorte.

Cruce de subwoofer / satelital incorporado.

*NOTA: No se recomienda una carga de 2 ohmios para uso a alta potencia.
Para evitar la limitación de protección, utilícelo sólo a niveles bajos.

CARACTERÍSTICAS DEL PANEL FRONTAL

CONMUTADOR DE ENCENDIDO-APAGADO

Mueva el conmutador basculante hacia arriba para encender el amplifi cador.
El indicador LED azul PWR se encenderá inmediatamente.
Los indicadores LED rojos CLIP pueden activarse durante 1-2 segundos hasta que el amplifi cador
haya completado su ciclo de encendido. Si no vuelven a encenderse las luces, verifi que el cable de
alimentación y el restablecimiento de CA en el panel posterior.

SP

16

NÚMERO DE MODELO

Las clasifi caciones de potencia
GX3 y GX5 se muestran en la
página de especifi caciones.

ABERTURAS DE VENTILACIÓN

El ventilador interno mueve el aire a través del chasis para
reducir el aumento de temperatura. Mantenga las aberturas
libres de obstrucciones. El ventilador se acelera como
respuesta al uso pesado.

CONTROLES DE LA GANANCIA, CH1, CH2

Las marcas muestran la atenuación en dB. Para uso

normal, mantenga el control en la mitad superior de

su intervalo (menos de 10 dB de atenuación). Si se

ajusta por debajo de la mitad, la fuente de la señal

puede sobrecargarse antes de que el amplifi cador

llegue a la máxima potencia.

17

MONTAJE EN BASTIDOR

Cabe en un bastidor estándar de 19
pulgadas, 2RU.
Acepta tornillos número 10 o de 6 mm,
dependiendo de los rieles del bastidor.
Añada un soporte posterior para evitar
daños en el equipo portátil.

SP

INDICADORES LED ROJOS DE RECORTE

Si parpadean de color rojo, signifi ca que el amplifi cador está siendo sobreexcitado. Una
sobreexcitación signifi cativa activa una reducción interna de la ganancia, para reducir la
distorsión de la sobrecarga. Cuando el nivel de la señal regrese a su nivel normal, se reanudará
la ganancia normal . Consulte la sección sobre resolución de problemas si el indicador LED rojo
permanece encendido de manera continua.

INDICADORES LED VERDES DE SEÑAL

El indicador LED verde comienza a parpadear al haber señales tenues (-35 dB), y cambia
hasta ponerse verde permanente a medida que aumenta el nivel de la señal.

INDICADOR LED DE ENCENDIDO

El indicador LED azul PWR (encendido) indica que el conmutador de CA está encendido, y que
el amplifi cador está recibiendo alimentación. Al cabo de dos segundos, está listo para usar.

MARCA DE GANANCIA ALTERNATIVA

Cuando el conmutador CROSSOVER (cruce) está activo (consulte el panel posterior),
LF (CH 1) controla las bajas frecuencias (subwoofer),
HF (CH 2) controla las altas frecuencias (caja media-alta).

CARACTERÍSTICAS DEL PANEL POSTERIOR

18

SP

CONMUTADOR DE CRUCE

POSICIÓN DE CRUCE

Divide una señal de intervalo completo para excitar un subwoofer y caja superior.
El canal CH 1 recibe los bajos, de 20 a 100Hz, para el subwoofer.
El canal CH 2 recibe 100Hz a 20kHz, para alimentar un altavoz de intervalo
completo.
Al usar el modo CROSSOVER, conecte la señal únicamente a CH 1.
Utilice los dos controles de ganancia para equilibrar las señales LF y HF
(consulte el panel frontal).

POSICIÓN DE INTERVALO COMPLETO

Para un uso normal con 2 canales, utilice con todas las entradas
activas. El cruce se elude.

ABERTURA DE
DESCARGA

Mantenga la abertura libre
de obstrucciones. Instale en
un bastidor de fondo abierto.

MONTAJE EN LAS OREJAS
POSTERIORES

Hay orejas posteriores diseñadas para proteger
el aislamiento de los hilos del conector posterior
y soportar el amplifi cador en un bastidor. Está
disponible un juego de montaje de apoyo en el
bastidor posterior (modelo FG-000031-00, paquete de
dos unidades) en el Grupo de Servicios Técnicos de
QSC.

CONEXIONES DE ENTRADA

ENTRADAS XLR EQUILIBRADAS

Patilla 2 Positivo, Patilla 3 Negativo, Patilla 1 Blindaje
(Tierra). Recomendadas para tramos largos o cortos,
fi jos o que se cambian frecuentemente. Los enchufes
XLR y TRS de cada canal se conectan internamente, y
proporcionan un pasaje al otro conector.

ENTRADAS EQUILIBRADA Y TRS DE 1/4 DE PULGADA

Punta Positivo, Anillo Negativo, Funda Blindaje (Tierra).
Recomendadas para tramos largos o cortos que se
cambian con frecuencia.

ENTRADAS DESEQUILIBRADA Y TS DE 1/4 DE PULGADA

Acepta enchufes desequilibrados de 1/4 de pulgada
para tramos cortos. Punta Positivo, Funda Blindaje
(Tierra).

ENTRADAS DESEQUILIBRADAS DE SONIDO

Punta Positivo, Cilindro Blindaje (Tierra). Recomendadas
para conexiones semipermanentes a fuentes cercanas,
dentro del mismo bastidor. NOTA: al usar estas entradas,
no deben usarse las entradas TRS o XLR.