RMX 2450 - Audio Amplifier QSC AUDIO - Free user manual and instructions

USER MANUAL RMX 2450 QSC AUDIO

Explanation of graphical symbols

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.

The exclamation point within an equilateral triangle is intended to alert the users to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.

CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel.

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

ATTENTION!

RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR

Explanation of graphical symbols 2

FEATURES & SETUP 8-13

CHARACTERISTIQUES ET LEUR UTILISATION

What are the differences among Stereo, Parallel Input, and Bridge

Mono modes? 12

Binding post outputs 17

Bornes à écrou

Anschlussklemmen

Safe operating levels 19

Sound reinforcement 20

Sonorisation

Beschallung

Sonido en vivo

Instrument amplification 21

TROUBLESHOOTING 22-26

DéPANNAGE

FEHLERBEHEBUNG

BUSQUEDA DE AVERIAS

Problem: no sound 22

Problem: squeals and feedback 26

INFORMATIONS DE GARANTIE

ADDRESS & TELEPHONE INFORMATION 30

Copyright 1999, 2001 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.

All other trademarks are the property of their respective owners.

TD-000085-00 Rev. D

Model	Power, 8 ohm/ch 1 kHz, 0.1% THD	Power, 4 ohm/ch 1 kHz, 0.1% THD	Power, 2 ohm/ch 1 kHz, 1% THD
RMX 850	200 W	300 W	430 W
RMX 1450	280 W	450 W	700 W
RMX 1850HD	360 W	600 W	900 W
RMX 2450	500 W	750 W	1200 W

The RMX Series Amplifiers.

These rugged fan-cooled, 2-channel, 2-RU amps provide high-value performance and power in a strong, compact chassis. The series comprises four models: the RMX 850, RMX 1450, RMX 1850HD, and RMX 2450.

The HD designation on the RMX 1850HD designates this model as "heavy duty". The RMX 1850HD is superior to all other RMX models for driving 2 ohm loads for extended periods. The RMX 1850HD is perfectly suited for subwoofer-type applications.

Features

• Independent, user-defeatable clip limiters
  Fully selectable low-frequency filtering; choice of 30 or 50Hz roll-off
• Stereo (dual-channel), parallel-input, or bridged mono operating modes
  Balanced inputs—XLR, 1% (6.3 mm) TRS, and barrier strip
• Binding post and Neutrik Speakon™ outputs
• Front panel LED indicators for signal and clip

1. Power switch
2. POWER indicator LED
3. Cooling vents
4. Gain control (Channel 1)
5. Gain control (Channel 2)
6. CLIP and SIGNAL indicator LEDs, both channels

Panneau avant

1. Barrier strip input
2. XLR inputs, Channels 1 and 2
3. Configuration switch
4. Configuration switch chart
5. TRS inputs, Channels 1 and 2
6. Speakon output, Channel 1 plus Channel 2
7. Speakon output, Channel 2
8. Binding post outputs, Channels 1 and 2
9. Fan
10. Serial number label
11. IEC connector for AC power cable
12. Circuit breaker

Panneau arrête

When the audio signal drives the amp's output circuit beyond its power capability, it clips, flattening the peaks of the waveform. The clip limiter detects this and reduces the gain to minimize the amount of overdrive. To preserve as much of the program dynamics as possible, limiting reduces the average program level until peaks barely clip.

Each channel has its own clip limiter, and you can switch it on or off independently, as shown at left.

WHEN TO USE IT (OR NOT)

When driving full-range speakers, clip limiting reduces high frequency distortion caused by bass overloads. It also protects higher frequency drivers from excess overdrive and harsh clipping harmonics.

When driving subwoofoers, some users let the amplifier clip without limiting because it gives extra "punch" to kick drums and similar sounds.

CAUTION: In bi-amp systems, excessive limiting will affect the frequency balance.

CHARACTERISTIQUES ET LEUR UTILISATION

= NOT APPLICABLE NON APPLICABLE NICTHT ANWENDBAR NO APPLICABLE

FEATURES & SETUP

Input filter

WHAT IT IS

The low-frequency (LF) filter rolls off signals below either 30Hz or 50Hz . This improves bass performance by limiting sub-audio cone motion, making more power available for the speakers' rated frequency range.

The filter settings for each channel are controlled individually through the DIP switch settings shown. When the filter is turned off, a 5 Hz rolloff protects against DC or deep sub-audio inputs.

WHEN TO USE IT (OR NOT)

As a rule, your speakers will sound better with proper filtering. Unless you already have filtering in a preceding device, match the setting to the low frequency rating of your speakers. Vented (bass reflex, ported, etc.) speakers are especially sensitive to cone over-excursion at frequencies below their rated limit.

The 50 Hz filter works well with most compact full-range speakers, and has a slight boost at 100 Hz for greater fullness. The 30 Hz filter is intended for subwoofoers and large full-range cabinets. The "off" position should be used only for applications such as studio playback monitoring, where you need to know if there are unwanted sub-audio signals present in your mix.

CHARACTERISTIQUES ET LEUR UTILISATION

Filtres d'entrée

DESCRIPTION

The "Parallel Input" switches let you operate the amplifier in parallel mode, delivering the same signal to both channels without using a Y-cable. Each channel drives its own speaker load, with independent gain, filtering, and clip limiting.

Set switch positions 4 and 5 "ON" to couple the inputs together. Turn the switches off for stereo, bi-amping, or other 2-channel modes.

With the inputs in parallel, you can use the other set of input connectors to carry the signal to other amps. This is often called a "daisy-chain."

WHEN TO USE IT

Parallel the inputs when driving two speakers with one input signal (parallel mode) while keeping separate control of both channels' gain, filtering, and limiting. Use them in bridged mono mode to patch the signal to additional amplifiers through the extra input jacks. See page 12 for an explanation of amp operating modes.

NOTE: If you're using a balanced signal, use only balanced patch cables; even one unbalanced cable will unbalance the entire signal chain, possibly causing hum.

NOTE: Turn off the "Parallel Inputs" switches when feeding the amp two separate signals.

CHARACTERISTIQUES ET LEUR UTILISATION

To patch the signal to additional amplifiers, use the parallel input switches described on page 10.

Bridged mono mode combines the power of both amp channels into one speaker, resulting in twice the

voltage swing, four times the peak power, and approximately three times the sustained power of a single channel. This mode uses Channel 1: input, gain control, input filter, and clip limiter; Channel 2's should not be used.

WHEN TO USE IT (OR NOT)

Use bridged mono to deliver the power of both channels to a single 8- or 4-ohm load. Set switch positions 6 and 7 to "BRIDGE MONO ON." Use Channel 1's inputs, and connect the speaker as shown.

BRIDGED-MONO PRECAUTIONS:

This mode puts a high demand on the amplifier and speaker. Excessive clipping may cause protective muting or speaker damage. Be sure the speaker has a sufficient power rating.

Output voltages greater than 100 volts rms are available between the bridged terminals of the RMX 2450. CLASS 3 wiring methods (NEC 1999), as specified in accordance with national and local codes, must be used to connect the speaker.

CHARACTERISTIQUES

ET LEUR UTILISATION

Mode ponté mono

DESCRIPTION

Stereo, bi-amp, 2-channel

Parallel

FEATURES & SETUP

What are the differences among Stereo, Parallel Input, and Bridge Mono modes?

STEREO MODE

This is the "normal" way of using the amplifier, in which each channel is fully independent. Separate signals connect at the inputs, the gain knobs control their respective channels, and separate speakers connect to each output.

Examples:

• Two-channel (stereo) playback.
• Two independent mono signals, such as main and monitor mixes.
• Bi-amped operation, with the low frequencies in Channel 1 and the highs in Channel 2.

PARALLEL INPUT MODE

This mode is just like Stereo mode, except that the inputs for Channel 1 and Channel 2 are internally connected together. A signal into any input jack will therefore drive both channels directly. Each channel's gain control still functions as usual, and each channel feeds its own speaker load.

You can patch the input signal on to additional amplifiers by using any of the remaining input jacks.

Example:

• One mono signal driving both channels, with independent gain control for each speaker system.

CHARACTERISTIQUES ET LEUR UTILISATION

Bridge mono with parallel switches engaged

FEATURES & SETUP

BRIDGE MONO MODE

This mode combines the full power capabilities of both channels into a single speaker system. The amplifier internally re-configures so that both channels operate as a unit. This delivers double the output voltage, resulting in four times the peak power and three times the sustained power into a single 8- or 4-ohm speaker load. The Bridge Mono mode section on page 11 describes the special speaker connection used.

Examples:

• Driving a single 8-ohm speaker with the combined 4-ohm power of both channels.
• Driving a single 4-ohm speaker with the combined 2-ohm power of both channels.

Precautions:

• Bridge Mono mode makes it possible to drive thousands of watts into a single speaker. AC current consumption will usually be higher. Avoid excessive signal level, and make sure the wiring and speaker can handle the power.
• If the load is 4 ohms or less and prolonged overloads occur, the amplifier will probably mute for several seconds during peaks, and the circuit breaker may trip.
• Do not use 2-ohm loads.

SEE THE ADDITIONAL BRIDGE MONO MODE WARNINGS ON PAGE 11.

CHARACTERISTIQUES ET LEUR UTILISATION

MODE PONTÉ MONO

Rack mounting of the amplifier is optional.

Use four screws and washers when mounting the amplifier to the front rack rails.

Support the amp at the rear also, especially in mobile and touring use; rear rack mounting ear kits are available from QSC's technical services department or by special order from your dealer or distributor.

INSTALLATION

XLR input pinout (unbalanced)

• pin 2

jumper pin1 to pin 3

力 pin1

CONNECTIONS Inputs

Each channel has active balanced XLR and 1 / 4 -inch (6.3mm) inputs wired in parallel. The input impedance is 20K balanced, 10K unbalanced.

Balanced signals are less prone to AC hum, but unbalanced signals can be suitable for short cable runs. The signal source's output impedance should be less than 600 to avoid high frequency loss in long cables.

Balanced inputs: Use the XLR or 1/4 -inch (6.3 mm) TRS input jacks, or the barrier strip.

Unbalanced inputs: Connect the unused side of the balanced input to ground, as shown below left. A tip-sleeve 14 -inch (6.3 mm) connector will correctly terminate the unused side of the input without modification.

For two-channel (stereo) operation, use the inputs for both Channel 1 and Channel 2; for parallel or bridged mono operation, use the Channel 1 input. See the section on operating modes for more explanation. To patch the audio signal to other amps (parallel and bridged modes only), see the instructions for using parallel inputs on page 9.

2 channels/canals/Kanäle/canals & 1 Speakon

(Stereo, bi-amp, or parallel mode; Modes stéreo, bi-amp ou parallele; Stereo-, Bi-Amp- oder Parallelbetrieb; Modos estéreo, bi-amp o parallelo)

Bridged mono · Mono ponté · Monobrückenbetrieb · Mono puente

CONNECTIONS

Speakon™ Outputs

The RMX amplifier offers a choice of output connections, with two Neutrik NL4MD Speakon jacks and two pairs of "touchproof" binding posts.

The Speakon connector is designed specially for high-power speaker connections. It locks in place, prevents shock hazard, and assures the correct polarity.

The upper Speakon jack has both Channel 1 and Channel 2 outputs, so it is especially useful for parallel, bitamp, or bridged mono operation (see bridged mono operating precautions on page 11). The other Speakon carries only Channel 2's output. See the illustrations at left.

For easier insertion, use the newer-style NL4FC Speakon connectors with quicklock thumb latches.

SPEAKER CABLING

Larger wire sizes and shorter lengths minimize both loss of power and degradation of damping factor. Do not place speaker cables next to input wiring.

WARNING: To prevent electric shock, do not operate the amplifier with any of the conductor portion of the speaker wire exposed.

CONNEXIONS

Sorties Speakon™

CONNECTIONS Binding post outputs

1. Strip back insulation not more than 13mm (1 / 2 inch).
2. Insert wire fully so that none of the conductor is exposed; tighten barrel (use coin if necessary).
3. Non-European models only.
4. Spade lugs must have insulated barrels to prevent electric shock.

WARNING: To prevent electric shock, do not operate the amplifier with any of the conductor portion of the speaker wire exposed.

Connections for stereo and parallel operations

Connections for bridged mono operation. See bridged mono operating precautions on page 11.

SPEAKER CABLING

Larger wire sizes and shorter lengths minimize both loss of power and degradation of damping factor. Do not place speaker cables next to input wiring.

Operating voltage (AC mains)

Make sure you connect the amplifier to the correct AC line voltage, which is shown on the serial number label. Connecting to the wrong line voltage is dangerous and may damage the amplifier.

Before applying power, check all connections and turn down the gain controls.

One second of muting is normal when the amp is turned on or off.

Gain controls

The actual voltage gain of the amplifier is shown in dB.

LED indicators

The yellow SIGNAL LED indicators light at approximately 0.1% of full power.

The red CLIP LED indicator flashes during overload (clipping).

If the amplifier's protection circuitry triggers protective muting, the

SIGNAL and CLIP LEDs will not light. If this occurs during use, see the Troubleshooting section of this manual.

UTILISATION

The fan speed varies automatically to maintain safe internal temperatures. Keep the front and rear vents clear to allow full air flow.

Hot air exhausts out the front of the amp so it does not heat the interior of the rack. Make sure that plenty of cool air can enter the rack, especially if there are other units which exhaust hot air into it.

Safe operating levels

The amp's protective muting system guards against excessive internal temperatures. With normal ventilation and 4- to 8-ohm loads, the amplifier will handle any signal level including overdrive—but make sure that the speakers can handle the full power! However, lower load impedances and higher signal levels produce more internal heating. Into 2-ohm loads, frequent or prolonged clipping (indicated by constant flashing of the red CLIP LED) may trigger protective muting.

Bridged mono mode doubles the output impedance of the amp; 4 ohms is the minimum load impedance. Heavy clipping may cause muting. If this happens, see Troubleshooting, page 23.

UTILISATION

Ventilation

Instrument amplification

APPLICATIONS

Amplification

d'instrument

ANWENDUNGS-

BEISPIELE

INDICATION: POWER INDICATOR NOT LIT

• Check the AC plug. Also check the circuit breaker on the rear panel.
• Confirm that the AC outlet works by plugging in another device. If too many amplifiers are used on one outlet, the building's circuit breaker may trip and shut off power.
• An overload in bridged mono mode may cause the amplifier to click off for several seconds. Check the load impedance (4 ohms minimum), or reduce signal level.
• An amplifier which keeps shutting off may have a serious internal fault. Turn it off, remove AC power, and have the amplifier serviced by a qualified technician.

DÉPANNAGE

No sound (continued)

INDICATION: SIGNAL LED NOT LIT

• If the green POWER indicator LED is lit and the fan is running, yet the signal LEDs indicate no signal, check the input. Make sure the signal source is operating and try another input cable. Connect the source to another channel or amplifier to confirm its operation.
  Overheating will cause protective muting. The fan will be running at full speed and the chassis will be hot to the touch; sound should resume within a minute as the amplifier cools to a safe operating temperature. Check for proper ventilation. If the fan isn't running at all, the amplifier requires servicing.

DÉPANNAGE

Pas de son (suite)

INDICATION: DEL SIGNAL ÉTEINTS CHECK

The amplifier is in protective muting.

One second of muting is normal when the amp is turned on or off.
Overheating will cause protective muting. The fan will be running at full speed and the chassis will be hot to the touch; sound should resume within a minute as the amplifier cools to a safe operating temperature. Check for proper ventilation. If the fan isn't running at all, the amplifier requires servicing.

DÉPANNAGE

INDICATION:CLIP LED FLASHING

• If the red CLIP indicator flashes before the signal indicator does, the load impedance is abnormally low or shorted. Unplug each speaker one-by-one at the amplifier. If the CLIP LED goes out when you disconnect a cable, that cable or speaker is shorted. Try another cable and speaker to locate the fault.

INDICATION:CLIP INDICATOR NOT FLASHING

• This could be caused by a faulty speaker or loose connection. Check the wiring and try another speaker.
• The signal source may be clipping. Keep the amplifier gain controls at least halfway up so that the source does not have to be overdriven.

Problem: no channel separation

• Check the switch settings on the back of the amplifier. Make sure the "Parallel Input" and "Bridge Mode" switches are OFF in dual-channel, bi-amp, or stereo use where different signals go to each channel.
• Make sure other equipment in the signal path, such as mixers, preamps, etc., are set for stereo, not mono.

DÉPANNAGE

INDICATION:DELCLIP CLSIGNOTE

INDICATION: DEL CLIP N'ALLUMENT PAS

• Unplug the amplifier input to confirm that the hiss is coming from the source or a device upstream; erratic or popping noises indicate an electronic fault in the offending unit.
• To keep the normal noise floor low, operate the primary signal source at full level, without clipping, and avoid boosting the signal further between the source and the amplifier.

Problème: souffle

Problem: squeals and feedback

• Microphone feedback should be controlled with mixer controls. If noise continues to build up with zero mic gain, there is a serious fault in the signal processors or cables. Working in succession from the signal source towards the amplifier, check each device in the signal path by reducing its gain or unplugging it.

	SPECIFICATIONS	SPECIFICATIONS	TECHNISCHE DATEN	ESPECIFICACIONES
	RMX 850	RMX 1450	RMX1850HD	RMX 2450
OUTPUT POWER in watts
FTC: 20 Hz-20 kHz @ 0.1% THD, both channels driven
8 ohms per channel	185	260	350	450
4 ohms per channel	280	400	550	650
EIA: 1 kHz @ 0.1% THD, both channels driven
8 ohms per channel	200	280	360	500
4 ohms per channel	300	450	600	750
1 kHz @ 1% THD, typical, both channels driven
2 ohms per channel	430	700	900	1200
Bridge Mono:
8 ohms, 20 Hz-20 kHz, 0.1% THD	530	800	1100	1300
8 ohms, 1 kHz, 0.1% THD	600	900	1200	1500
4 ohms, 1 kHz, 1% THD, typical	830	1400	1800	2400
DYNAMIC HEADROOM	2 dB @ 4 ohms	2 dB @ 4 ohms	2 dB @ 4 ohms	2 dB @ 4 ohms
DISTORTION
SMPTE-IM	< 0.01%	< 0.01%	< 0.02%	< 0.02%
FREQUENCY RESPONSE20 Hz-20 kHz, +0/-1 dB(at 10 dB below rated output power)	-3 dB points: 5 Hz and 50 kHz	-3 dB points: 5 Hz and 50 kHz	-3 dB points: 5 Hz and 50 kHz	-3 dB points: 5 Hz and 50 kHz
DAMPING FACTOR	>300 @ 8 ohms	>300 @ 8 ohms	>300 @ 8 ohms	>300 @ 8 ohms
NOISE (unweighted 20 Hz to 20 kHz, below rated output)	100 dB	100 dB	100 dB	100 dB
VOLTAGE GAIN	31.6× (30 dB)	40× (32 dB)	46× (33 dB)	50× (34 dB)
INPUT SENSITIVITY, V RMSfull rated power @ 8 ohms	1.15v (+3.4 dBu)	1.15v (+3.4 dBu)	1.16v (+3.5 dBu)	1.23v (+4.0 dBu)
INPUT IMPEDANCE (all models)	10K ohms unbalanced20K ohms balanced
CONTROLS (all models)	Front: AC switch, Ch. 1 and Ch. 2 gainRear: 10-position DIP switch
INDICATORS (all models)	POWER: Green LED	CLIP: Red LED, 1 per channel	SIGNAL: Yellow LED, 1 per channel
CONNECTORS (all models)	Input: Active balanced; XLR and ¼" (6.3 mm) TRS, tip and pin 2 positive, and barrier stripOutput: "Touch-Proof" binding posts and Neutrik SpeakonTM
COOLING (all models)	Continuously variable speed fan, back-to-front air flow
AMPLIFIER PROTECTION (all models)	Full short circuit, open circuit, thermal, ultrasonic, and RF protectionStable into reactive or mismatched loads

SPECIFICATIONS RMX 850

SPECIFICATIONS RMX 1450

TECHNISCHE DATEN RMX1850HD

ESPECIFICATIONES RMX 2450

LOAD PROTECTION

Turn-on/turn-off muting AC Coupling

Turn-on/turn-off muting AC coupling

Turn-on/turn-off muting Triac crowbar (on each channel)

Turn-on/turn-off muting Triac crowbar (on each channel)

OUTPUT CIRCUIT TYPE AB

AB

AB

H

H

DIMENSIONS (all models)

19.0" (48.3 cm) wide, 3.5" (8.9 cm) tall (2 rack spaces) 15.9" (40 cm) deep (rack mounting to rear support ears)

WEIGHT Shipping:

41 lb. (18.6 kg)

46 lb. (20.9 kg)

50.5 lb. (23 kg)

50.5 lb. (23 kg)

Net:

35 lb. (15.9 kg)

40 lb. (18.2 kg)

44.5 lb. (20.2 kg)

44.5 lb. (20.2 kg)

POWER REQUIREMENTS

As printed on rear panel Serial Number label. Available for 100, 120 or 220-240 VAC, 50/60 Hz

CURRENT CONSUMPTION @ 120 VAC (both channels driven)

Typical1 Full2 Max3

Typical1 Full2 Max3

Typical1 Full2 Max3

Typical1 Full2 Max3

Idle

0.5 A

Idle

0.5 A

1.1 A

Idle

0.6 A

8Ω

3 A

4.1 A

7.4 A

3.7 A

5.4 A

10 A

3.9 A

6.9 A

12.6 A

4 A

9.7 A

4Ω

4.5 A

6.6 A

11.5 A

6 A

9.6 A

16 A

6.1 A

11.2 A

20.8 A

6.3 A

15.6 A

2Ω

6.5 A

9.5 A*

17 A*

9.3 A

14.7 A*

25 A*

8.7 A

16.6 A*

32.0 A*

9.2 A

23 A*

POWER CONSUMPTION NOTES

1 1/8 power with pink noise represents typical program with occasional clipping.
1/3 power with pink noise represents severe program with heavy clipping.
3 Continuous sine wave at 1% THD clipping.
* Thermal or overcurrent cutback limits duration.

WARRANTY INFORMATION

INFORMATIONS DE GARANTIE

(USA only; see your dealer or distributor)

Disclaimer

QSC Audio Products, Inc. is not liable for any damage to speakers, amplifiers, or any other equipment that is caused by negligence or improper installation and/or use of the RMX amplifier.

Product Warranty

QSC guarantees the RMX to be free from defective material and/or workmanship for a period of three years from the 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 via prepaid transportation with a copy of the proof of purchase, i.e., sales receipt. This warranty provides that examination of the returned 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 Audio Products, Inc.

1675 MacArthur Boulevard

Costa Mesa, CA 92626-1468 USA

Telephone Numbers / Numeros de téléphone / Telefonnummern / Numberos de Telefono:

Main Number / Numero principal / Hauptnummer / Numero principal +[phone]

Sales Direct Line / Ligne directe ventes / Verkauf-Direkt / Linea directo ventas + [phone]

Sales & Marketing / Ventes & marketing / Verkauf u. Marketing / Ventas y marketing [phone]

(toll-free in U.S.A. only)

(sans frais aux -U seulment)

(toll-free in U.S.A. only)

(sans frais aux -U seulment)

[e-mail]

AUDIO

Important Safety Precautions & Explanation of Symbols

WARNING!

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

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.

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.

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- Maximum operating ambient temperature is 50^ (122^)
8- Never restrict airflow through the device fan or vents. Please insure that the air intake and exhaust vents are unobstructed.
9- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
10- Do not defeat the safety purpose of the grounding-type plug. The grounding plug has two blades and a grounding prong. The third prong is provided for your safety. If the provided plug does not fit your outlet, consult an electrician for the replacement of the obsolete outlet. Do not cut off the grounding prong or use an adapter that breaks the grounding circuit. This apparatus must be properly grounded for your safety.
11- Protect the power cord from being walked on or pinched, particularly plugs, convenience receptacles, and the point where they exit from the apparatus.
12- This product is not equipped with an all-pole mains switch. To fully disconnect from the AC mains, the AC plug must be removed from the AC outlet or the appliance coupler (IEC block) must be removed from the amplifier module. Ensure either the AC line cord plug or the appliance coupler are accessible in case of emergency disconnect requirement.
13- Connect the unit only to a properly rated supply circuit.
14- Reliable Earthing (Grounding) of rack-mounted equipment should be maintained.
15- Use only attachments/accessories specified by QSC Audio Products, Inc.
16- Unplug the apparatus during lightning storms or when unused for long periods of time.
17- 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.
18- The appliance shall not be exposed to dripping or splashing and no objects filled with liquids, such as vases, shall be placed on the apparatus.
19- When installing equipment into rack, distribute the units evenly. Otherwise, hazardous conditions could be created by an uneven weight distribution.