QSC Audio CX702, CX1102, CX1202V, CX302V, CX254 User Manual

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CX Series User Manual Installed Sound Professional Audio Amplifiers

2-Channel Low-impedance Models:

CX302 CX502 CX702 CX902 CX1102

4-Channel Low-impedance Models:

CX254 CX404

70 Volt Direct Output Models:

CX204V (4-channel) CX302V (2-channel) CX602V (2-channel, 8 ohm capable) CX1202V (2-channel, 4 and 8 ohm capable)

*TD-000077-00*

TD-000077-00 Rev.E

Important Safety Precautions & Explanation of Symbols

1- Read these instructions. 2- Keep these instructions. 3- Heed all warnings. 4- Follow all instructions. 5- WARNING: To prevent fire 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. 8- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 9- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. 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 fit your outlet, consult an electrician for the replacement of the obsolete outlet. 10- Protect the power cord from being walked on or pinched, particularly plugs, convenience receptacles, and the point where they exit from the apparatus. 11- Use only attachments/accessories specified by QSC Audio Products, Inc. 12- Use only with hardware, brackets, stands, and components sold with the apparatus or by QSC Audio Products, Inc. 13- Unplug the apparatus during lightning storms or when unused for long periods of time. 14- Refer all servicing to qualified 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 flashes printed next to the OUTPUT terminals of the amplifier are intended to alert the user to the risk of hazardous energy. Output connectors that could pose a risk are marked with the lightning flash. Do not touch output terminals while amplifier power is on. Make all connections with amplifier turned off.

The lightning flash 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 sufficient 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 fire or electric shock, do not expose this equipment to rain or moisture.

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.

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

All trademarks are the property of their respective owners.

Introduction

Thank you for purchasing this QSC power amplifier. Please read the following directions to obtain the best results.

The CX model line-up features:

•2 channel and 4 channel low-impedance or transformerless 70V output models

•Each channel pair has its own DataPort and Mode Switch

•QSC DataPorts connect to the most advanced QSC accessories and monitoring systems

•Mode switches for Clip Limit, Low Frequency Filter, Stereo, Bridge Mono, and Parallel Inputs

•QSC PowerWave high-performance, compact, and light weight switching power supply

•Complete amplifier protection and monitoring

•Barrier strip output connectors

•XLR and terminal block balanced input connectors

•Gain controls are recessed and detented

•Security cover for gain controls prevents tampering

•Active inrush current limiting eliminates need for power sequencing

•LED indicators for power, parallel or bridge mode, input signal presence, -20dB, -10dB, and clip/protect

•Optional front panel handles

•Optional IT-42 isolated output transformer for CX302 for 25V, 70V, and 100V (or 50V, 140V, and 200V bridge mode)

Unpacking

Factory packed carton contains:

•CX amplifier

•User's manual

•Security cover for gain controls

•Adhesive rubber feet (for non-rack mount applications)

•3-pin terminal block input connectors

•Spade lug output connectors

•IEC-type detachable power cord

Use the same type carton when shipping the amplifier.

Front Panel

(CX404 shown, other models similar)

1- Power Switch 2- Cooling Air Exhaust Vents 3- LED Indicators

4- Security Panel Retaining Screw 5- Gain Controls 6- Security Panel Retaining Slots

Rear Panel

(CX404 shown, other models similar, 2-Ch. models equipped with XLR inputs as well)

1- CH1 Terminal Block Input Connectors 2- DataPort Connector 3- CH2 Terminal Block Input Connectors 4- Mode Switches

Rack Mounting

Optional handles shown. Use four screws and washers to mount the amplifier to the equipment rack rails. To use the amplifier outside a rack, attach the self-adhesive rubber feet to the bottom.

5- Barrier Strip Output Connectors 6- Cooling Air Inlet Vents 7- Mode Switch Setting Diagrams 8- IEC Power Connector

Cooling

Air flows from the rack, into the back of the amplifier, and out the front. This keeps the rack cool. The fan automatically runs faster when the amp is working hard.

Do not block the front or rear air vents!

Air flow in QSC amplifiers: Cool air is drawn into the rear of the amplifier by the cooling fan. Warm air exits the front of the amplifier.

AC Mains Connection

Connect AC power to the IEC socket on the back of the amplifier. NOTE: Turn off the AC power switch before connecting AC power. The AC Switch must be turned on to use remote control systems or the Standby function.

The correct AC line voltage is shown on the serial number label, on the rear panel. Connecting to the wrong line volt-

age may damage the amplifier or increase the risk of electric shock.

Setting the Mode Switches

Two-Channel Models: One mode switch controls each channel’s indepen-

dent clip limiting and low frequency (LF) filtering. The switches can set the amplifier’s operating mode for Stereo, Parallel, or Bridge operation.

Four-Channel Models: There are two mode switches; one controls the operation of channels 1-2, the other controls the operation of channels 3-4. It is not possible to bridge or parallel channels 1 or 2 with channels 3 or 4.

Typical Mode Switch block as seen from the rear of the amplifier (CX404V model shown).

Setting Clip Limiters

Each channel has a clip limiter with its own on-off switch. The limiter only responds to actual clipping, and automatically compensates for load and voltage variations. Clip limiting is generally recommended, especially to protect high frequency drivers.

Set switch UP (ON position) to use Clip Limiting. Switch 1 controls the first channel. Switch 10 controls the second channel.

Selecting Stereo, Parallel, or Bridge Mode

Each of the channel pairs can be set for normal Stereo operation, Parallel Input mode, or Bridge Mono mode. On four-channel models, Ch.1 can be bridged or paralleled with Ch.2; Ch.3 can be bridged or paralleled with Ch.4.

Stereo Mode- Each channel within the pair remains independent, and each may be used for a different signal.

Parallel Mode - This setting connects both inputs of a pair together. One signal feeds both channels. Do not connect different sources to each input. Each channel's Gain control and speaker connection remain independent.

Bridge Mode- This setting combines both channels of a pair into a single channel with twice the output voltage. Use only the first channel's input and Gain control. Set the second channel's Gain control at minimum.

Do not connect different inputs to each side of a channel pair when operating in parallel or bridge mode.

Each channel has its own switch for Clip Limiter on/off.

The first channel uses switch 1. The second channel uses switch

10. On four-channel models, the second mode switch has switches for Ch.3 and Ch.4

Stereo Mode - Switches 4, 5, 6 and 7 are all set to the DOWN position.

Parallel Mode - Switches 4, 5, and 6 are set to the UP position. Switch 7 is set to the DOWN position.

Bridge Mode- Switches 4, 5, 6 and 7 are all set to the UP position.

Setting Low Frequency Filters

Each channel has a 12dB per octave Low Frequency filter that can be set on or off. Low impedance models can be set for 33 or 75 Hertz and distributed output (“V” models) for 50 or 75 Hertz to prevent saturation of the 70V speaker transformers. This reduces distortion and prevents amplifier overload.

Low Impedance Models: The filter should only be turned off for driving subwoofers. The 33 Hz setting usually works well with loudspeakers that have large LF drivers (12” or larger). The 75 Hz setting works well with compact (smaller size) loudspeakers. Check the loudspeaker’s specifications and select the setting closest to the loudspeaker’s low frequency capability.

High Impedance (“V”) Models: The filter should only be turned off for driving subwoofers with special low frequency transformers. The 50 Hz setting usually works well with high quality speaker transformers. The 75 Hz setting works well with speech-grade speakers and transformers.

Low Frequency Filter (“V” model shown): Each channel has its own switches for LF filter on/off and frequency selection.

•The first channel uses switches 2,3. The second channel uses switches 8,9.

•Switches 3 and 8 turn the LF filter ON or OFF.

•Switches 2 and 9 select 33/75 Hz (low Z) or 50/75 Hz (“V” models) or 75 Hz.

•On four-channel models, the second mode switch has switches for Ch.3 and Ch.4

DataPort

Two-channel models have one DataPort, four-channel models have two DataPorts (one Ch.1-2, one for Ch.3-4). The DataPort connects to optional QSC accessories and processing devices. DataPort devices provide remote Standby control, monitoring, DSP processing, filter and crossover functions. The CX’s DataPort supports the full "V1" DataPort feature set. Two-channel models support directly-mounted DSP “modules”. Four channel models require remote mounting of accessory modules connected with DataPort cables.

Each DataPort connects to its respective channel pair; Ch.1-2 or Ch.3-4. Each channel pair may use its DataPort or the Terminal Block inputs. When using the DataPort, do not connect to that channel's Terminal Block inputs. Amplifier Standby is controlled only by the Ch.1- 2 DataPort.

DataPorts on a 4-Ch. amplifier.

DataPort Tips:

1- DataPort 1-2 controls Standby for the entire amplifier. The AC switch must be turned ON before the DataPort

can control the power.

2- Each DataPort controls and monitors the signals to its respective channel pair (Ch.1-2, Ch.3-4). 3- Do not use the Bridge Mono or Parallel mode switches when using DataPort Inputs. The signal level may be reduced. For more infor-

mation, see the Owner's Manual for the DataPort device. 4- A DataPort device is normally used to control the signal gain before entering the amplifier. Set the front panel Gain controls at maximum after confirming correct operation. If desired, install the protective cover to prevent tampering.

5- Each channel uses a separate internal heat sink. The heat sink temperatures are reported on that pair's DataPort. 6- Consult your QSC dealer or the QSC web site for the latest DataPort products.

Inputs

Each channel has a balanced 3-pin terminal block input. Two channel models also feature XLR inputs. The input impedance is 12k ohm balanced or 6k ohm unbalanced. A set of terminal block connectors is included in the carton. Terminal block wiring is connected with simple hand tools, and inputs can be changed quickly. XLR inputs are connected with standard cables and can be changed quickly. Pinouts are marked on the rear panel.

Balanced connections are recommended to reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suitable for short cables. The signal's source impedance should be less than 600 ohms. If the DataPort is being used for input signals, do not connect cables to the terminal blocks.

Terminal Block Connectors

Balanced inputs: Strip the wires ¼ inch (6mm) and connect to the plug

as shown. Be sure to tighten the screws firmly.

Unbalanced inputs: Strip the wires ¼ inch (6mm) and connect to the plug as shown. The middle pin must be connected to the shield pin as shown. Be sure to tighten the screws firmly.

XLR Inputs (2-Ch. models only)

Balanced inputs: Connect to the plug as shown.

Unbalanced inputs: Connect to the plug as shown.

Pin 3 and pin 1 must be connected with a jumper as shown.

Outputs

Wiring connections are shown on the back of the chassis. Carefully note the polarity marks, which are arranged to make Bridge Mode connections easier. Four-channel models are shown in the examples; two-channel models are similar.

OUTPUT TERMINAL SAFETY WARNING! Do not touch output terminals while amplifier power is on. Make all connections with amplifier turned off. Risk of hazardous energy!

Low Impedance Outputs

Stereo and Parallel Mode- Connect each loudspeaker to its own channel of

the amplifier, as shown on the chassis label. The mode configuration switches must be set for Stereo or Parallel mode.

Bridge Mode- Bridge mode configures the channel pair to drive a single highpower loudspeaker load. The mode configuration switches must be set for Bridge mode. Use only the first channel's input and Gain control. Set the second channel's Gain control at minimum.

Distributed Outputs (“V” models, 70V/140V)

Stereo and Parallel Mode- Connect each 70V circuit to its own channel of the

amplifier, as shown on the chassis label. The mode configuration switches must be set for Stereo or Parallel mode.

70V Output- Risk of hazardous energy! Class 2 wiring shall be used for 70V outputs.

Bridge Mode- Bridge mode configures the channel pair to drive a single 140V

audio circuit. The mode configuration switches must be set for Bridge mode. Use only the first channel's input and Gain control. Set the second channel's Gain control at minimum. Connect the load as shown on the chassis label.

140V BRIDGE MODE PRECAUTIONS:

Class 3 Wiring shall be used for bridged mono 140V outputs.

Low Impedance Stereo or Parallel Connection- Each loudspeaker load connects to its respective channel. Four channel model shown. Ensure that all speaker connections maintain proper polarity.

Low Impedance Bridge Connection- Each loudspeaker load connects to a bridged channel pair. Fourchannel model shown. Check for proper polarity.

70V stereo or parallel connection- Each 70V zone connects to its respective channel. Ensure that all speaker connections maintain proper polarity.

140V Bridge connectionWire each bridged pair to a 140V circuit as shown. Check for proper polarity.

Connect only 140V distributed audio circuits in bridged mode. Do not use 70V loads in bridge mode! Use Stereo or Parallel mode channels to drive 70V loads. 140V is the minimum for bridge mode operation.

Loads Rated by Model

Be sure the model amplifier you are using is rated for the load!

An asterisk (*)indicates the model is rated for the load. (S/P)= Stereo/Parallel mode (Br.)= Bridge mode

LED Indicators

The LED indicators can be used to monitor system operation and identify common problems.

POWER: GREEN, above the BRIDGE (BRDG) and PARALLEL (PAR) indicators.

Normal indication: AC switch ON: LED will illuminate.

If no indication: Check AC power cord and AC outlet. Confirm that DataPort 1-2 is

not holding the amp in 'Standby' mode.

CLIP: RED, adjacent the channel number markings.

Normal indication: illuminates whenever the amplifier is driven beyond full power.

The resulting distortion corresponds to the brightness of the LED. Distortion that causes only brief flashing may not be audible.

-During muting, the LED fully illuminates. This occurs during normal "On-Off" muting.

Abnormal indication:

-Bright red illumination while the amp is being used indicates either thermal muting or a shorted output.

-If the amplifier overheats, the fan will run at full speed, and operation should resume within one minute. Allow the fan to run, and make sure the amplifier ventilation is adequate.

-A shorted or overloaded output circuit will cause excessive Clip flashing and possible overheating. If distortion is audible without a Clip indication, the problem is either before or after the amplifier. Check for damaged speakers or overloaded signal source. The amplifier Gain control should be in the upper half of its range to prevent input overload.

LED indicators on 2-channel models.

LED indicators on 4-channel models.

SIGNAL, -20dB, -10dB: GREEN, under each Clip LED.

Normal indication: The SIGNAL indicator illuminates when the input signal exceeds

-35 dB, the -20dB indicator illuminates when the signal exceeds -20dB, and the -10dB indicator illuminates when the signal exceeds -10dB.

If no indication: check Gain settings and increase gain if necessary. Check input connections and audio source for signal. If the Clip LED illuminates with little or no Signal indication, check the output wiring for shorts.

Abnormal indication: If the SIGNAL (SIG), -20dB, or -10dB LED illuminates with no signal input, there may be system oscillations or some other malfunction. Disconnect the load and fully reduce the gain. If the LED remains on, the amp may need servicing.

BRDG and PAR:

Each channel pair has a YELLOW LED for Bridge Mode, and an ORANGE LED for Parallel mode. These show how the rear panel switches are set (see Setting the Mode Switches). In Stereo mode, both LEDs should be OFF.

Gain Controls

The Gain controls are recessed and can be adjusted with a small screwdriver or flat tool. If desired, the Gain Control Security Cover can be installed to prevent changes to the installer's settings.

Turn the gain controls clockwise to increase gain and counter clockwise to decrease gain. The maximum voltage gain of the amplifier varies depending on the model designation. Maximum voltage gain for each model is shown on the front panel label in parentheses adjacent the 0dB attenuation setting.

The Gain controls are marked in dB of attenuation. There are 21 detents for repeatable adjustments. The upper 14 steps are about 1 dB each, and settings should normally be made within this range. The range below -14 dB should not be used for normal program levels, as the input headroom could be exceeded, but can be used for testing at reduced levels. At the minimum setting, the signal is completely cut off.

Gain Control Security Plate

The cover blocks access to the Gain settings. The LED indicators are still visible to monitor the system's operation.

Gain controls on 2-channel models. Markings will vary depending on model.

Gain controls on 4-channel models. Markings will vary depending on model.

1. Use a 9/64" or 3.5 mm hex driver to loosen the screw

several turns. Do not remove it completely.

2. Slide the right end of the cover under the loosened

screw.

3. Insert the left end tabs into the last row of ventilation

slots, and slide the panel fully to the right. It should lock into the slots.

4. Confirm that the LED's are visible through the cover. Tighten the hex screw carefully.

CX902 shown with gain control security plate installed.

Specifications 2-Channel Low-Impedance Models

CX302 CX502 CX702 CX902 CX1102

OUTPUT POWER (Watts)

20 - 20k Hz, 0.03% THD, 8 Ohms/Ch. 200 300 425 550 700 20 - 20k Hz, 0.05% THD, 4 Ohms/Ch. 325 500 700 900 1100 1k Hz, 1.0% THD (EIA), 8 Ohms/Ch. 215 325 475 625 1k Hz, 1.0% THD (EIA), 4 Ohms/Ch. 375 550 825 1050 1k Hz, 1.0% THD (EIA), 2 Ohms/Ch. 600 800 1200 1500 1700 Bridge Mono, 20 - 20k Hz, 0.1% THD, 16 Ohms 400 600 850 1100 1400 Bridge Mono, 20 - 20k Hz, 0.1% THD, 8 Ohms 700 1000 1500 2000 Bridge Mono, 1k Hz, 1.0% THD, 8 Ohms Bridge Mono, 1k Hz, 1.0% THD, 4 Ohms 1200 1600 2400 3000 3400

DISTORTION, SMPTE-IM <0.01% <0.01% <0.02% <0.02% <0.02%

FREQUENCY RESPONSE 20 - 20k Hz, ±0.2dB at 10dB below rated output power, all models (-3dB points: 8 Hz and 100 kHz)

SIGNAL to NOISE, unweighted, 20 - 20k Hz -106 dB -107 dB -106 dB -104 dB -106 dB

VOLTAGE GAIN 31.5x (30dB) 40.0x (32dB) 50.5x (34dB) 56.6x (35dB) 56.6x (35dB)

INPUT SENSITIVITY, Vrms

for rated power into 8 Ohms 1.26 (+4.2dBu) 1.23 (+4.0dBu) 1.16 (+3.5dBu) 1.17 (+3.6dBu) 1.35 (+4.8dBu) for rated power into 4 Ohms 1.14 (+3.4dBu) 1.12 (+3.2dBu) 1.05 (+2.6dBu) 1.06 (+2.7dBu) 1.17 (+3.6dBu)

OUTPUT CIRCUIT TYPE AB AB H H H

INPUT IMPEDANCE 6k ohms unbalanced, 12k ohms balanced, all models

DYNAMIC HEADROOM 2 dB at 4 Ohms, all models

DAMPING FACTOR >500 at 8 Ohms, all models

AMPLIFIER PROTECTION Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads

COOLING Continuously variable speed fan; back-to-front air flow through heat sink tunnel

CONTROLS Front: AC POWER switch, gain controls (1 control per channel, 21 detents)

Back: 10-position DIP switch with Clip Limiter (1 per Ch.), LF Filter on/off (1 per Ch.)

LF filter select: 33 or 50 Hz (1 per Ch.), Stereo/Parallel/Bridge mode selection switches

LED INDICATORS POWER (green, 1 each), SIGNAL, -10dB, -20dB (green, 1 each per Ch.), CLIP (red, 1 each per channel),

BRDG and PAR (yellow, 1 each)

CONNECTORS Input: 3-pin terminal blocks ("euro" or "Phoenix" type) and XLRs (pin 2 positive)

Output: barrier strip connectors with protective shroud Other: QSC DataPort connector (supports full “V1”feature set)

LOAD PROTECTION Turn-on/turnoff muting, AC coupling (DC fault blocking), Clip limiting.

POWER REQUIREMENTS Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.

DIMENSIONS 19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 14" (35.6 cm) D (from front mounting rails, including rear support ears)

WEIGHT 21 pounds (9.5 kg) net; 27 pounds (12.3 kg) shipping

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Specifications 4-Channel Low-Impedance Models

CX254 CX404

OUTPUT POWER (Watts)

20 - 20k Hz, 0.03% THD, 8 Ohms/Ch. 170 250 20 - 20k Hz, 0.05% THD, 4 Ohms/Ch. 250 1k Hz, 1.0% THD (EIA), 8 Ohms/Ch. 1k Hz, 1.0% THD (EIA), 4 Ohms/Ch. 450 1k Hz, 1.0% THD (EIA), 2 Ohms/Ch. 450 Bridge Mono, 20 - 20k Hz, 0.1% THD, 16 Ohms 340 500 Bridge Mono, 20 - 20k Hz, 0.1% THD, 8 Ohms 500 Bridge Mono, 1k Hz, 1.0% THD, 8 Ohms 900 Bridge Mono, 1k Hz, 1.0% THD, 4 Ohms 900

DISTORTION, SMPTE-IM <0.01% <0.01%

FREQUENCY RESPONSE 20 - 20k Hz, ±0.2dB at 10dB below rated output power, all models (-3dB points: 8 Hz and 100 kHz)

SIGNAL to NOISE, unweighted, 20 - 20k Hz -106 dB -106 dB

VOLTAGE GAIN 29.0x (29dB) 36.5x (31dB)

INPUT SENSITIVITY, Vrms

for rated power into 8 Ohms 1.28 (+4.4dBu) 1.22 (+3.9dBu) for rated power into 4 Ohms 1.08 (+2.9dBu) EIA: 1.16 (+3.5dBu)

OUTPUT CIRCUIT TYPE AB AB

INPUT IMPEDANCE 6k ohms unbalanced, 12k ohms balanced, all models

DYNAMIC HEADROOM 2 dB at 4 Ohms, all models

DAMPING FACTOR >500 at 8 Ohms, all models

AMPLIFIER PROTECTION Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads

COOLING Continuously variable speed fan; back-to-front air flow through heat sink tunnel

CONTROLS Front: AC POWER switch, gain controls (1 control per channel, 21 detents)

Back: 10-position DIP switch (1 per channel pair) with Clip Limiter (1 per Ch.), LF Filter on/off (1 per Ch.)

LF filter select: 33 or 50 Hz (1 per Ch.), Stereo/Parallel/Bridge mode selection switches (1 set per Ch. pair)

LED INDICATORS POWER (green, 1 each), SIGNAL, -10dB, -20dB (green, 1 each per Ch.), CLIP (red, 1 each per channel),

BRDG and PAR (yellow, 1 each per Ch. pair)

CONNECTORS Input: 3-pin terminal block ("euro" or "Phoenix" type)

Output: barrier strip connectors with protective shroud, one barrier strip per Ch. pair Other: two QSC DataPort connectors (supports full “V1”feature set), one DataPort per Ch. pair

LOAD PROTECTION Turn-on/turnoff muting, AC coupling (DC fault blocking), Clip limiting.

POWER REQUIREMENTS Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.

DIMENSIONS 19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 14" (35.6 cm) D (from front mounting rails, including rear support ears)

WEIGHT 21 pounds (9.5 kg) net; 27 pounds (12.3 kg) shipping

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Specifications 2- and 4-Channel Distributed 70V Line Models

CX204V CX302V CX602V CX1202V

OUTPUT POWER (Watts)

20 - 20k Hz, 0.03% THD, 70V/Ch. 200 200 400 800 20 - 20k Hz, 0.03% THD, 8 Ohms/Ch. 550 700 20 - 20k Hz, 0.05% THD, 4 Ohms/Ch. 1100 1k Hz, 0.05% THD (EIA), 70V/Ch. 220 250 440 1000 1k Hz, 0.1% THD (EIA), 70V/Ch. 300 600 1200 1k Hz, 1.0% THD (EIA), 70V/Ch. 300 Bridge Mono, 140V, 20 - 20k Hz, 0.1% THD 400 400 800 850 Bridge Mono, 140V, 1k Hz, 0.1% THD 440 600 1200 2400 Bridge Mono, 1k Hz, 0.1% THD, 16 Ohms 1200 1400 Bridge Mono, 1k Hz, 0.1% THD, 8 Ohms 2300

DISTORTION, SMPTE-IM <0.02%, all models

FREQUENCY RESPONSE 20 - 20k Hz, ±0.2dB at 10dB below rated output power, all models (-3dB points: 8 Hz and 100 kHz)

SIGNAL to NOISE, unweighted, 20 - 20k Hz -106 dB. all models

VOLTAGE GAIN 56.6x (35dB) all models

INPUT SENSITIVITY, Vrms 1.26V (+4.2dBu) for rated power at 70.7V

OUTPUT CIRCUIT TYPE AB AB AB H

INPUT IMPEDANCE 6k ohms unbalanced, 12k ohms balanced, all models

DYNAMIC HEADROOM 2 dB at 4 Ohms, all models

DAMPING FACTOR >500 at 8 Ohms, all models

AMPLIFIER PROTECTION Short circuit, open circuit, thermal, ultrasonic and RF protection. Stable into reactive or mismatched loads

COOLING Continuously variable speed fan; back-to-front air flow through heat sink tunnel

CONTROLS Front: AC POWER switch, gain controls (1 control per channel, 21 detents)

Back: 10-position DIP switch with Clip Limiter (1 per Ch.), LF Filter on/off (1 per Ch.)

LF filter select: 33 or 50 Hz (1 per Ch.), Stereo/Parallel/Bridge mode selection switches

LED INDICATORS POWER (green, 1 each), SIGNAL, -10dB, -20dB (green, 1 each per Ch.), CLIP (red, 1 each per channel),

BRDG and PAR (yellow, 1 each)

CONNECTORS Input: 3-pin terminal blocks ("euro" or "Phoenix" type)and XLRs (pin 2 positive)

Output: barrier strip connectors with protective shroud Other: QSC DataPort connector (supports full “V1”feature set)

LOAD PROTECTION Turn-on/turnoff muting, AC coupling (DC fault blocking), Clip limiting.

POWER REQUIREMENTS Refer to rear panel serial number label. Configured at factory for 100, 120 or 220-240 VAC, 50- 60 Hz.

DIMENSIONS 19.0" (48.3 cm) W, 3.5" (8.9 cm) H, 14" (35.6 cm) D (from front mounting rails, including rear support ears)

WEIGHT 21 pounds (9.5 kg) net; 27 pounds (12.3 kg) shipping

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Thermal Loss Table

This table provides typical thermal loss in BTU/ hr. and kcal/hr. for each model as a function of load and output power level.

• 1/8 power (pink noise) represents typical program with occasional clipping. Use this rating for most applications.

• 1/3 power (pink noise) represents severe program with heavy clipping.

• Full power (sine) are continuous sine wave driven at 1% clipping. Thermal or overcurrent cutback limits duration of full power 2 Ohm operation.

Current Draw Table (in Amperes)

This table provides typical current draw for each model as a function of load and output power level. Units of measurement are Amperes r.m.s.

NOTE! Current draw shown is for 120 VAC line. For 230 VAC models, multiply values shown by 0.5 .

• 1/8 power (pink noise) represents typical program with occasional clipping. Use this rating for most applications.

• 1/3 power (pink noise) represents severe program with heavy clipping.

• Full power (sine) is continuous sine wave driven at 1% clipping.

• Thermal or overcurrent cutback limits duration of full power 2 Ohm operation.

Precauciones importantes 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. 8- No lo instale cerca de fuentes de calor tales como radiadores, registros térmicos, estufas ni otros aparatos (inclusive amplificadores) que produzcan calor. 9- No anule ningún elemento de seguridad de la clavija polarizada o de la clavija con conexión a tierra. Una clavija polarizada tiene dos hojas, una más ancha que la otra. Una clavija con conexión a tierra tiene dos hojas y un terminal de conexión a tierra. La hoja ancha o el tercer terminal se proporcionan para su seguridad. Si la clavija que se le proporciona no cabe en su tomacorriente, consulte con un electricista para reemplazar el tomacorriente obsoleto. 10- Proteja el cable de alimentación para que no camine sobre él ni se le comprima, particularmente las clavijas, las tomas de corriente y el punto en donde sale del aparato.

11- Use sólo piezas/accesorios especificados por QSC Audio Products, Inc. 12- Use sólo con herraje, soportes, estantes y componentes vendidos con el aparato o por QSC Audio Products, Inc. 13- Desenchufe el aparato durante tormentas eléctricas o cuando no lo vaya a usar durante periodos prolongados de tiempo. 14- Refiera todo el servicio a personal calificado. Es necesario dar servicio al aparato cuando sufra algún daño, como cuando se daña el cable de alimentación eléctrica o la clavija, 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.

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.

Los rayos impresos cerca de los terminales de SALIDA del amplificador tienen la intención de alertar al usuario del riesgo de energía peligrosa. Los conectadores de salida que pudiesen representar un riesgo están marcados con el símbolo del rayo. No toque los terminales de salida mientras el amplificador está encendido. Asegúrese de que todas las conexiones con el amplificador estén apagadas.

El símbolo del rayo con una punta de flecha 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 suficiente para constituir un riesgo de descarga eléctrica a 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.

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 con 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.

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

Todas las marcas comerciales son propiedad de sus respectivos dueños.

Introducción

Muchas gracias por la compra de este amplificador de potencia QSC. Por favor lea las siguientes instrucciones para obtener los mejores resultados.

El modelo CX tiene las siguientes características:

•Modelos de salida de 70V de baja impedancia o sin transformadores de 2 y de 4 canales

•Cada par de canales tiene su propio conectador DataPort y conmutador de modo

•Los conectadores DataPort QSC conectan a los accesorios y sistemas de supervisión QSC más avanzados

•Conmutadores de modo para límite de recorte, filtro de baja frecuencia, y entradas estereofónicas, monopuenteadas y paralelas

•Suministro de potencia de conmutación QSC PowerWave de alto rendimiento, compacto y ligero

•Protección y control completos del amplificador

•Conectadores de salida con barra protectora

•Conectadores de entrada balanceada XLR y de bloque de terminales

•Los controles de ganancia están empotrados y con retenes

•La cubierta de seguridad de los controles de ganancia evita las alteraciones

•La limitación activa de la corriente de entrada elimina la necesidad de secuenciación de la potencia

•Indicadores LED de potencia, modo paralelo o puenteado, presencia de señal de entrada, -20dB, -10dB, y recorte/protección

•Asas opcionales para el panel frontal

•Transformador IT-42 de salida aislada para CX302 para 25V, 70V y 100V (o modo puenteado de 50V, 140V y 200V)

Desembalaje

La caja empacada en fábrica contiene:

•Amplificador CX

•Manual del usuario

•Cubierta de seguridad para los controles de ganancia

•Patas adhesivas de caucho (para aplicaciones de montaje que no sean en bastidor)

•Conectadores de entrada de tres patas al bloque de terminales

•Conectadores de salida de lengüeta de pala

•Cable de alimentación desprendible tipo IEC

Cuando embarque el amplificador utilice el mismo tipo de caja.

Panel frontal

(Se muestra el modelo CX404, es similar a otros modelos)

1- Conmutador de encendido 2- Ventilas de descarga del aire de enfriamiento 3- Indicadores LED

4- Tornillo de retención del panel de seguridad 5- Controles de ganancia 6- Ranuras de detención del panel de seguridad

Panel posterior

(Se muestra el modelo CX404, los otros modelos son similares, los modelos de dos canales también están equipados con entradas XLR)

1- Conectadores de entrada del bloque de terminales del Canal 1 2- Conectador DataPort 3- Conectadores de entrada del Canal 2 al bloque de terminales

Montaje en bastidor

Se muestran las asas opcionales. Use cuatro tornillos y arandelas para montar el amplificador en los rieles del bastidor del equipo. Para usar el amplificador sin bastidor, instale las patas de caucho autoadhesivas en la parte inferior.

4- Conmutadores de modo 5- Conectadores de salida con barra protectora 6- Ventilas de entrada del aire de enfriamiento 7- Diagramas para el ajuste del conmutador de modo 8- Conectador de potencia IEC

Enfriamiento

El aire fluye desde el bastidor hacia el interior por la parte posterior del amplificador y hasta afuera por la parte frontal. Esto mantiene la rejilla fría. El ventilador automáticamente funciona más rápido cuando el amplificador está trabajando mucho.

¡No obstruya las ventilas frontales o posteriores!

Conexión a la línea principal de CA

Conecte la CA en el receptáculo IEC que se encuentra en la parte posterior del amplificador. NOTA: Apague el conmutador de CA antes de conectar la CA. El conmutador de CA debe estar encendido para usar los sistemas de control remoto o la función de Espera.

El voltaje correcto de la línea de CA se muestra en la etiqueta del número de serie que se encuentra en el panel posterior. Si se

conecta un voltaje de línea incorrecto se puede dañar el amplificador o aumentar el riesgo de una descarga eléctrica.

Flujo de aire en los amplificador QSC: El aire frío es arrastrado hacia el interior de la parte posterior del amplificador por el ventilador de enfriamiento. El aire caliente sale por el frente del amplificador.

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