QSC CMX800V User manual
Contents
1. stereo BRIDGE MONO OFF L rarae INPUTS BRIDGE MONO OFF L m BRIDGE MONO ON J BRIDGE MONO ON sho alos Figure 10 Channel 2 settings switches 8 and 10 are set to off CH1 output CH2 output Figure 12 Figure 11 To patch the signal to additional amplifiers use the parallel input switches described under Parallel Input Mode Os pr la Figure 13 The Difference Between Modes Stereo Mode Stereo mode is the typical way of using the amplifier Each channel is fully independent Separate signals connect at the inputs the attenuation knobs control their respective channels and separate speakers connect to each output The dip switches are set as shown in Figure 14 a schematic illustration in Figure 15 Examples e Two channel stereo playback Two independent mono signals such as main and monitor mixes e Bi amped operation with the low frequencies in Channel 1 and the highs in Channel 2 Ch 1 ET input y e stereo mm a PARALLEL INPUTS 4 Ch 2 BRIDGE MONO OFF pm UT BRIDGE MONO ON aot A A Figure 14 Figure 15 Parallel Input Mode This mode is similar to the Stereo mode except that the inputs for Channel 1 and Channel 2 are internally connected together A signal into Channel 1 jack2. MODE SWITCHES 1 CLIP LIMITER ON HA gt sond 2 30Hz FILTER E PINOUTS FILTER ON 3 FILTER OFF pnia Pa PARALLEL rh iae EE Sous PS TRNG mono off LA id E CIE Fueron 8 FILTER OFF 9 30Hz FILTER Ho CLIP LIMITER ON MODE SWITCHES INPUT Figure 9 Bridge Mono Mode What it is Bridge 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 s input attenuation control input filter and clip limiter Channel 2 s dip switch settings should be in the OFF position the attenuation control should be at maximum attenuation Figure 10 and 11 When to use it or not Use Bridge Mono mode to deliver the power of both channels to a single 8 or 40 load Set switch positions 6 and 7 to BRIDGE MONO ON Figure 10 Use Channel 1 s inputs and connect the speaker as shown in Figure 12 and 13 Bridge 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 CMX 800V CLASS 3 wiring methods NEC 1999 as specified in accordance with national and local codes must be used to connect the speaker
3. Q Q IN ZIN Indication CLIP LED flashing 17 KXUIY NIY the red CLIP indicator flashes when signal is applied the amplifier output may be PIN ZUNZUN shorted Check the speaker wiring for stray strands or breaks in the insulation Indication CLIP LEDs bright and steady Ve Ve The amplifier is in protective muting DKT DKT 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 Problem Distorted Sound LIP In 27 Indication CLIP LED flashing TRS TA 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 1 7N Indication CLIP LED not flashing This could be caused by a faulty speaker or loose connection Check the wiring and try another speaker NUY _ AS Wz The signal source may be clipping Keep the amplifier attenuation controls at mid point so that the source does not have to be overdriven Problem No channel se
4. Heavy clipping may cause muting If this happens see the Troubleshooting section below through the following page Warm air exits the amplifier and rack Rack Figure 34 Troubleshooting Problem No Sound 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 40 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 W Indication SIGNAL LED responding to signal level gt IN If the green SIGNAL indicators are lighting normally the fault is somewhere between the amp and the speaker Check the speaker wiring for breaks Try another speaker and cable Indication SIGNAL LED not lit Auz WH Qu 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 16 S A Sg 4 Cool air enters the amplifier and rack VIS 1
5. THD Bridge Mono Mode 80 FTC 20 Hz 20 kHz 0 1 THD 8Q EIA 1 kHz 0 1 THD 40 EIA 1 kHz 1 THD 70 V Direct drive EIA 1 kHz 1 THD 100 V Direct drive EIA 1 kHz 1 THD Distortion SMPTE IM Signal to Noise 20 Hz 20 kHz 8Q Input Sensitivity 80 Voltage Gain 80 Output Circuitry Power Requirements Typical 1 8 power pink noise at 40 120 VAC 230 VAC Severe 1 3 power pink noise at 40 120 VAC 230 VAC Frequency Response Damping Factor Input Impedance Q Input Clipping Cooling Connectors each channel Controls Indicators Amplifier Protection Load Protection Dimensions HWD Weight Net Shipping CMX 300V CMX 500V CMX 800V 185 W 260 W 450 W 200 W 300 W 500 W 280W 400 W 650 W 300 W 500 W 800 W 430 W 700 W 1200 W z 400 W 530 W 800 W 1300 W 600 W 900 W 1500 W 830 W 1400 W 2400 W 600 W 1200 W 2000 W 600 W 2300 W lt 0 02 lt 0 01 lt 0 01 gt 100 dB 1 15 V 3 4 dBu 1 15 V 3 4 dBu 1 23 V 4 0 dBu 30 dB 32 dB 33 dB Class AB Class AB 2 tier Class H 44 54 6 3 A 2 2A 2 7A 3 2A 6 6A 9 6 15 6 A 3 3 A 4 8 78 20 Hz 20 kHz 0 1 dB 3 dB points 5 Hz and 50 kHz LF filter bypassed 8Q gt 300 at 8Q 10 KQ unbalanced 20 kQ balanced 10 Vrms 22 dBu Continuously variable speed fan back to front air flow Input Active balanced barrier strip XLR and 1 4 6 3 mm TRS tip and XLR pin 2 positive Output Detachab
6. as shown by loudspeaker symbols 1 and 2 and the solid wires in Figure 30 Bridge Mode Wire as shown by Bridge Mono loudspeaker symbol and the dashed wires in Figure 30 1 CH1 output sun 66606060 UU CH2 output Figure 30 mg BRIDGE Terminal Block Connector Wiring UL IEC Wire range 6 mm Solid wire AWG 28 10 Stranded wire AWG mm 28 10 Torque lb in 6 2 Wire strip length 7 8mm Table 3 14 Operating Voltage AC Mains Make sure you connect the amplifier to the correct AC line voltage as shown on the serial number label Connecting to the wrong line voltage is dangerous and may damage the amplifier Figure 31 f le o W yj J fi U J 120 VAC 220 240 VAC Figure 31 Operation AC Power Switch Before applying power check all connections and turn the attenuation controls fully counter clockwise to maximum attenuation One second of muting is normal when the amp is turned on or off Figure 32 Attenuation Controls The controls are marked with a scale indicating attenuation Maximum attenuation is fully counter clockwise minimum attenuation is fully clockwise Figure 33 LED Indicators The green SIGNAL LED indicators light at approximately 0 1 of full power The red CLIP LED indicator flashes during overload clip
7. drives both channels directly Figure 16 Use Channel 1 Input do not connect different sources to both channels Each channel s attenuation control still functions as usual and each channel feeds its own speaker load The dip switches are set as shown in Figure 17 In Parallel mode you can patch the input signal on to additional amplifiers by using any of the remaining input jacks See Ch 2 in Figure 16 Example e One mono signal driving both channels with independent attenuation control for each speaker system 2 _ Ch 1 BD ignal i t stereo ns J PARALLEL INPUTS eau A e 4 BRIDGE MONO OFF I nn J BRIDGE mono ON 7 Ch 2 NO INPUT N l nee x Can be used to Daisy chain I additional amplifiers Figure 17 Amplifier 2 Figure 16 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 4Q speaker load The Bridge Mono mode section on page 7 describes the special speaker connection used Examples Precautions Driving a single 8Q speaker with the combined 40 power of both channels Driving a single 4Q speaker with the combined 2Q power of both channels Bridge Mono mod
8. three pronged Edison style power cable 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 plug or use an adapter that breaks the grounding circuit This apparatus must be properly grounded for your safety 9 Protect the power cord from being walked on or pinched particularly plugs convenience receptacles and the point where they exit from the apparatus 10 The appliance coupler is the AC mains disconnect and should remain readily operable after installation 11 Use only attachments accessories specified by QSC Audio Products LLC 12 Use only with hardware brackets and components sold with the apparatus or by QSC Audio Products LLC 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 15 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 Warranty USA only other countries see yo
9. 00V 800V 8Q FTC 20 Hz 20 kHz 0 1 THD 185 W 260 W 450W 8Q EIA 1 kHz 0 1 THD 200 W 300 W 500 W 4Q FTC 20 Hz 20 kHz 0 1 THD 280 W 400 W 650 W 40 EIA 1 kHz 0 5 THD 300 W 500 W 800 W 20 EIA 1 kHz 1 THD 430 W 700 W 1200 W 70V Direct Drive EIA 1 kHz 1 THD 400 W Table 1 5 Attenuation control Channel 1 6 Clip and Signal indicator LEDs Channel 2 7 Attenuation control Channel 2 4 Clip and Signal indicator LEDs Channel 1 8 Lockout plate retention screw 1 2 3 5 6 7 8 PROFESSIONAL AMPLIFIER Figure 1 ATTEN TA 1 CLIP SIG qu On CHANNEL 2 ATTEN 12 19 8 CLIP SIG ms Back Panel 1 Barrier strip input 7 Terminal block connector outputs Channels 1 and 2 2 XLR inputs Channels 1 and 2 8 Circuit Breaker 3 Configuration dip switches 9 Serial number label 4 TRS inputs Channels 1 amp 2 10 Configuration switch chart 5 Fan 11 IEC power inlet power cord connector 6 Speakon output Channel 1 and 2 c LISTED D UTPUT coumenca ani system Figure 2 Features and setup Clip Limiter What it is When the audio signal drives the amplifier 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 p
10. CMX Series User Manual OSE CMX 300V CMX 500V CMX 800V TD 000322 00 B a IAC OF IMPORTANT SAFETY PRECAUTIONS AND EXPLANATION OF SYMBOLS WARNING The lightning flash with the 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 shock to humans The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operation and maintenance servicing instructions in this manual 1 Read these instructions 2 Keep these instructions 3 Heed all warnings 4 Follow all instructions A WARNING To prevent fire or electric shock do not expose this equipment to rain or moisture Do not use this apparatus near water 5 Clean only with a dry cloth 6 Allow a minimum of 6 152 mm clearance behind cabinet for convection cooling Keep anything that might restrict airflow from the rear of the enclosure i e draperies fabric etc Do not block any ventilation opening This product is a power amplifier that produces heat 7 Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 8 Do not defeat the safety purpose of the grounding type plug on the
11. 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 web site at www qscaudio com 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 Office All trademarks are the property of their respective owners Introduction These rugged fan cooled 2 channel 2RU amplifiers provide high value performance and power in a strong compact chassis The series comprises four models the CMX 300V CMX 500V CMX 800V and CMX 2000V The CMX 2000V is covered in a separate manual Features Independent user defeatable clip limiters Fully selectable low frequency filtering choice of 30 or 50 Hz roll off Stereo dual channel parallel input or Bridge Mono operating modes Balanced inputs XLR 14 6 3 mm TRS and barrier strip Pluggable terminal block and Speakon outputs 21 detent gain knobs Front panel LED indicators for signal and clip and power Attenuation control security plate Front Panel 1 Power switch 2 Power indicator LED 3 Cooling vents CMX CMX CMX Stereo mode both channels driven 300V 5
12. e 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 subwoofers 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 1 LFSOHZ MY LF30HZ 1 LF OFF 0 dB LF FILTER ON EXC EM LF FILTER OFF CH 1 1 A 2 LF OFF 3 4 5 LF FILTER ON C LF FILTER OFF CH 2 r LFSOHZ CW 3 LF30HZ 20Hz30 40 5060 80100 200 300 400500 1 kHz Figure 5 Figure 4 1 EON 50 HZ 0dB Ch 1 A Ch 24 2 LF ON Com cm 50HZ 3 4 5 20Hz30 40 5060 80 100 200 300 400500 1 kHz Figure 6 1 LF ON AIRE 0 dB Ch 1 1 Ch 24 2 F LF ON Cm 30HZ 3 4 5 S20Hz30 40 5060 80100 200 300 400500 1 kHz Figure 7 Parallel Input Mode What it is The Parallel Input switches let you operate the amplifier in Parallel mode de
13. e 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 40 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 2A loads Ensure Channel 2 dip switches are set to off Figure 18 and Channel 2 attenuation control is set to maximum attenuation See the additional Bridge Mono precautions on page 7 BRIDGE MONO OFF J BRIDGE mono ON allo Figure 18 Set Channel 2 dip switches 8 and 10 to off Channel 1 input Channel 2 input not used Channel 1 eae sine signalinput gt Channel 2 No input i i i i i Can be used to Daisy chain additional amplifiers Figure 19 Distributed Constant Voltage Outputs 70 Volt Operation Specificat CMX CMX CMX The CMX 300V and 500V must be configured for Bridge Mono mode for 70 peciicanons 300V 500V 800V Volt operation Please refer to the above section on Bridge Mono mode for Stereo Mode Both Channels Driven proper setup configuration The CMX 800V can operate in 70 Volt operation in Stereo mode or Bridge 70 Volt 400 W Mono mode 100 Volt 100 Volt Operation Bridge Mo
14. eration see Bridge Mono mode operating precautions on page 7 The other Speakon carries only the output from Channel 2 For easier insertion use the newer style NL4FC Speakon connectors with quick lock thumb latches Not shown 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 gt To Channel 1 speaker d CHI jie CH2 To Channel 2 speaker CH1 m To Channel 1 speaker To Channel 2 speaker Channel 1 Channel 2 Figure 28 Figure 29 13 2 channels amp 2 Speakon connectors Stereo bi amp or parallel mode 2 channels amp 1 Speakon connectorss Stereo bi amp or parallel mode Bridge Mono mode Terminal Block Connector The termi 1 on A WN N Strip the w nal block connector requires the following assembly ires to 7 8 mm Insert the plug into the receptacle on the amplifier Use a flat ip screwdriver to secure the wires Tighten the screws to 6 in bs ip screwdriver to secure the connector Tighten the screws to 6 in lbs Insert the wires into the male part of the connector according to the Mode you are using See below Use a flat Stereo and Parallel Mode Wire
15. le terminal block and Speakon Front AC Switch Channe Rear 10 position DIP swit Power on Green LED S 1 and Channel 2 gain knobs ch ignal Green LED 1 per channel Clip Red LED 1 per channel Stable into reactive or mismatched loads On off muting AC Coupling CMX 300V and CMX 500V triac crowbar CMX 800V on each channel 3 5 2RU x 19 x 15 9 89 mm x 483 mm x 400 mm 35 lb 15 9 kg 41 Ib 40 Ib 18 2 kg 46 lb 18 6 kg 20 9 kg 44 5 Ib 20 2 kg 50 5 Ib 23 0 kg 18 OSCE Mailing Address QSC Audio Products LLC 1675 MacArthur Boulevard Costa Mesa CA 92626 1468 USA Telephone Numbers Main Number 714 754 6175 Sales amp Marketing 714 957 7100 or toll free USA only 800 854 4079 Customer Service 714 957 7150 or toll free USA only 800 772 2834 Facsimile Numbers Sales amp Marketing FAX 714 754 6174 Customer Service FAX 714 754 6173 World Wide Web www qscaudio com E mail info qscaudio com service qscaudio com 2010 QSC Audio Products LLC All rights reserved QSC and the QSC logo are registered trademarks of QSC Audio Products LLC in the U S Patent and Trademark office and other countries Speakon is a trademark of Neutrik All other trademarks are the property of their respective owners Patents may apply or be pending
16. leeve 1 4 6 3 mm connector will correctly terminate the unused side of the input Figure 26 For Stereo operation use the inputs for both Channel 1 and Channel 2 For Parallel or Bridge Mono operation use the Channel 1 input See the section on operating modes for more information To patch the audio signal to other amps Parallel and Bridge Mono modes only see the instructions for using Parallel Inputs on page 6 HA gt s0 FILTER ON O BRIDGE MONO OFF FILTER ON Hy 50 Hal Balanced ground A a inverting Input non inverting input Figure 25 MODE SWITCHES MODE SWITCHES 1 CLIP LIMITER ON 2 30 Hz FILTER 8 FILTER OFF 9 30Hz FILTER 10 CLIP LIMITER ON 12 XLR unbalanced Jumper pin 1 to pin 3 Pin 1 Ground Figure 23 Pin2 Pin 3 TRS unbalanced No modification needed Figure 24 Unbalance ground W744 non inverting input e i Figure 26 Speakon Outputs CMX amplifiers offer a choice of output connections with two Neutrik NL4MD Speakon jacks and a Terminal Block connector 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 bi amp or Bridge Mono mode op
17. livering 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 to PARALLEL INPUTS to couple the inputs together Figure 8 Turn the switches to STEREO 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 Figure 9 This is often called a daisy chain When to use it Use the Parallel mode when driving two speakers with one input signal Parallel mode while keeping separate control of both channels gain filtering and limiting Use Parallel mode and Bridge Mono mode to patch the signal to additional amplifiers through the extra input jacks 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 stereo BRIDGE MONO OFF J PARALLEL INPUTS J BRIDGE mono ON INPUT IMPEDANCE 20K 8 ED 10K UNBALANCED HO 1 SUPLIMTER ON PINOUTS iim 3 EROE LRT PA PARALLEL rh Er sal TF3 IRN mono or LA 12 PSD E i Fou Figure 8 MODESWITCHES INPUT INPUT IMPEDANCE gt en O INPUT
18. no Mode The CMX 500V and CMX 800V must be configured for Bridge Mono mode for 100 Volt operation Please refer to the Bridge Mono mode section for proper 70 Volt 600 W 1200 W 2000W setup configuration 100 Volt 600 W 2300 W Table 2 10 Installation 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 Use the dimensions Figure 20 and 21 for planning Side view 15 75 400 mm 15 23 387 mm 3 0 D 76 2 mm ee Figure 20 17 3 440 mm 14 65 372 mm 15 75 400 mm Figure 21 11 Connections Inputs Each channel has active balanced XLR and 14 6 3 mm inputs wired in parallel Figure 22 The input impedance is 20 kQ balanced 10 KQ 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 6000 to avoid high frequency loss in long cables Balanced Inputs Use the XLR or 14 6 3 mm TRS input jacks or the barrier strip Figure 25 Unbalanced Inputs Connect the unused side Pin 3 of the balanced input to ground Pin 1 as shown in Figure 23 A tip s
19. ossible 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 in Figure 3 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 subwoofers some users let the amplifier clip without limiting because it gives extra punch to kick drums and similar sounds A CAUTION In bi amp systems excessive limiting will affect the frequency balance CLIP LIMITER OFF ME 3 CLIP LIMITER ON CH 1 CLIP LIMITER OFF ME CLIP LIMITER ON CH2 Figure 3 4 Input Filter What it is The low frequency LF filter rolls off signals below either 30 Hz or 50 Hz Figure 6 and 7 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 in Figure 4 When the filter is turned off Figure 5 a5 Hz roll off 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 th
20. paration 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 Problem Hum Move cabling and signal sources to identify hot spots in the system Cables with faulty shielding are a frequent entry point for hum Problem Hiss 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 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 CLIP SIG 17 Specifications Stereo Mode both channels driven 8Q FTC 20 Hz 20 kHz 0 1 THD 8Q EIA 1 KHZ 0 1 THD 4Q FTC 20 HZ 20 KHZ 0 1 THD 40 EIA 1 KHZ 0 5 THD 20 EIA 1 KHZ 1 THD 70 V Direct drive EIA 1 kHz 1
21. ping 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 on pages 16 17 On CHANNEL 1 ATTEN CHANNEL2 ATTEN a 12 2 8 12 0 8 CLIP SIG D Se CLIP SIG Y De oi D Ne 24 2 2 LD 2 oo 32dB 0 oo 32dB 0 Figure 32 Figure 33 Model Maximum Voltage Gain CMX 300V 31 6 x 30 dB CMX 500V 40 x 32 dB CMX 800V 46 x 33 dB Table 4 15 Fan cooling 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 8Q 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 2Q 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 4Q is the minimum load impedance
22. ur dealer or distributor Disclaimer QSC Audio Products LLC is not liable for any damage to amplifiers or any other equipment that is caused by negligence or improper installation and or use of this loudspeaker product QSC Audio Products 6 Year Limited Warranty QSC Audio Products LLC QSC guarantees its products to be free from defective material and or workmanship for a period of six 6 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 Le sales receipt This warranty provides that the examination of the return product must indicate in our judgment a manufacturing defect This warranty does not extend to any product which has been subjected to misuse neglect accident improper installation or where the date code has been removed or defaced QSC shall not be liable for incidental and or consequential damages This warranty gives you specific legal rights This limited warranty is freely transferable during the term of the warranty period Customer may have additional rights which vary from state to state In the event that this product was manufactured for export and sale outside of the United States or its territories then this limited warranty shall not apply
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