QSC GX3 Manuale utente
EN
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
GX POWER AMPLIFIER SERIES
*TD-000271-00*
TD-000271-00 REV. D
TM
2
EN
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 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 ampliers) 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 prong are provided for your safety. If the provided plug does not 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 specied 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 qualied 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.
!The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance
(servicing) instructions in this manual.
The lightning 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 sufcient 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 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 Ofce
All trademarks are the property of Speakon® and PowerCon® are registered trademarks of Neutrik LLC their respective owners.
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.
3
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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
(servicing) instructions in this manual.
The lightning 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 sufcient 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 re or electric shock, do not expose this equipment to rain or moisture.
WELCOME
Thank you for purchasing a QSC Audio amplier. The GX Series
is the latest in a long line of hard-working, low cost ampliers,
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.
UNPACKING
Conrm that the amplier has no visible shipping damage.
Conrm that amplier 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 amplier 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
certied 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
amplier. 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 qualied
service personnel for inspection and repairs.
POWER RATINGS
Watts at 0.1% clipping, both channels driven
Model 8 ohms 4 ohms 2 ohms*
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.
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) 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 amplier and
loudspeakers from damage due to temperature rise or
overdrive without shutting down the show.
Front panel LEDs monitor Power, Signal and Clipping.
Subwoofer / Satellite crossover built-in.
GX POWER AMPLIFIER SERIES
Professional Power Ampliers
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FRONT PANEL FEATURES
inches (cm)
ON-OFF SWITCH
Move the rocker switch up to turn on the amplier.
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.
MODEL NUMBER
The GX3, GX5, and GX7
power ratings are shown on
the Specications page.
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.
5
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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 amplier reaches full power.
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.
RED CLIP LEDS
Red 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 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).
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REAR PANEL FEATURES
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.
REAR EAR MOUNTING
Rear ears designed for protecting the
rear connector wire dressing and
supporting the amplier in a rack. A
rear rack support mounting kit (model
FG-000031-00 pack of two) is available
from QSC Technical Services Group.
EXHAUST VENT
Keep vent clear. Install in
open-back rack.
INPUT CONNECTIONS
Pin 2 Positive, Pin 3 Negative, Pin 1 Shield (Ground).
Recommended for long or short runs, either 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.
BALANCED XLR INPUTS
CROSSOVER SWITCH
7
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AC BREAKER RESET
If the amplier 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 amplier 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.
AC INLET
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.
SPEAKER CONNECTIONS
8
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SYSTEM HOOKUP EXAMPLES
9
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SYSTEM HOOKUP EXAMPLES
TROUBLESHOOTING
10
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NO POWER, NO LIGHTS, NO FAN
Conrm 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
amplier by pushing in the button. If the breaker trips off
quickly, the amplier needs servicing.
AMPLIFIER LOSES VOLUME
If the amplier 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.
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 ashing, the amplier 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 amplier may distort at lower-than-normal levels, with
increased ashing of the red CLIP LED. This should be
checked by trying an alternate speaker and cable.
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 ashing the red
CLIP LED, the distortion is not occurring inside the amplier.
Either the speaker is bad or the input signal is distorted.
• Conrm that the speaker is OK by trying a different unit.
• Input overload can occur if the amplier 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.
NO SOUND, WITH BLUE LED ONLY, NO GREEN OR
RED LED
Conrm that the Gain controls are turned up. Conrm that
the input cables are correctly installed at both ends. If using
1/4-inch speaker cables, do not confuse with input cables.
Conrm that the source is active. If necessary, try another
source, or connect another amplier 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 briey 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 conict. 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.
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 amplier emits smoke or burning smells
• If the case is severely dented or deformed
• If the amplier is soaked with any uid
• If internal parts sound loose
• If the AC breaker trips when power is applied
• If the amplier is dropped, carefully inspect for damage or
loose parts before attempting to use.
TROUBLESHOOTING
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