GXD Amplifier
Contents
1. gt BANDI BAND2 BANDS or BAND4 gt EE OOB gt GAIN gt Ee m 1 BANDWIDTH C2 Q 8 7 GAIN 12 dB to 12 dB gt ED 0 gt FREQUENCY gt D ba Q B 7 FREQUENCY 20 Hz to 20 kHz gt EI C2 gt BW bandwidth gt CED 10 039 B BANDWIDTH 0 1 Oct to 3 0 Oct gt EE Ea Figure 28 Figure 29 Figure 30 DELAY DSP gt DELAY See Figure 31 DELAY 7 27 FT DELAY 2 22 M 1 From HOME gt DELAY 8 48 MS 2 B gt STEREO DSP gt E O Q pELAY gt ET 4 C Q B 7 DELAY 0 00 to 56 30 FT or 17 16 M or 50 MS gt Figure 31 Limiter LIMITER TYPE LIMITER POWER See Figure 32 TYPE AGGR TYPE AGGR 1 From HOME gt EF Fe 0 0 2 B gt STEREO DSP gt ED O GB gt LIMITER gt E Figure 32 Figure 33 4 gt ETE 5 29 B MILD MEDIUM or AGGRESSIVE gt Cv 6 gt POWER gt E Model 40 80 1 0 B 7 POWER see Table 4 gt ED GXD4 5 60 Wa 8 IMPEDANCE 40 or 80 gt ED Crowe ODE SUE Table 4 TD 000450 01 A 10 DRAFT 2015 20 07 Utilities Status UTILITIES gt STATUS See Figure 34 AM RA RUN TIME 1 From HOME gt EF 2 O gt UTILITIES gt EDI Pe AE STATUS gt C Figure 34 a AMP TOTAL RUN TIME Hours HH MM SS b HARDWARE the version of t2. TD 000450 01 A 8 DRAFT 2015 20 07 PRESET RECALL Recall a preset to configure the amplifier to meet the requirements of your loudspeakers and installation There are 20 Presets See Figure 18 PRESET gt RECALL ENTER 20 5085 100 2 1 From HOME gt Ce Qu sr gt 2 gt PRESET gt EET GU ose B gt PRESET RECALL gt EED ENTER TO SELECT 4 C Q B gt the preset you want gt Figure 18 PRESET SAVE Pl ST SAT FULL RANGE Saves the active preset with any DSP changes See Figure 19 RESET ann 1 From HOME EE PRESET SAVE AS 2 a PRESET gt ED OB gt PRESET SAVE gt E Figure 19 PRESET SAVE AS PRESET gt SAVE AS P20 MONO SUBS 100 HZ Select the LOCATION and or change the NAME to save changes you make to the DSP See Figure 20 and Figure 21 1 From HOME ENTER TO SELECT 2 OB gt PRESET gt ED Figure 20 5 B gt PRESET SAVE AS gt ET ERTER 4 C B gt LOCATION gt GD P20 MONO SUBS 100 HZ 5 QB gt the LOCATION P1 to P20 gt 6 00 gt gt ED ENTER PRESS TO ADVANCE 7 letter number hyphen or space gt repeat When finished gt SEU 8 SAVE gt ETF ET 8 STEREO DSP or DSP and DSP STEREO DSP 15 set for both channels equally at the same time Separate DSPs DSP A and DSP are set independently for each channel Any changes you
3. gt 00 gt 00 1 00 gt gt o gt Stereo Mono Full Range Satellites P19 P20 MONO SATS Stereo Mono Full Range Satellites ose Table 5 TD 000450 01 A 12 DRAFT 2015 20 07 Specifications Stereo Mode watts per channel 8Q dynamic both channels driven 4Q dynamic both channels driven 8Q continuous both channels driven 4Q continuous both channels driven Distortion typical 1 kHz at full rated power Signal to Noise A weighted 20 Hz 20 kHz Input Sensitivity Voltage Gain 80 Output Circuitry Power Requirements 1 8 power at 4Q 100 Vac 120 Vac 230 Vac Frequency Response 20 Hz 20 kHz Dynamic Headroom 4 2 Damping Factor Input Impedance Q Maximum Input Level Input Connectors each channel Output Connectors each channel Amplifier and Load Protection Front Panel Controls and Indicators DSP Functions Dimensions HWD Weight Net Weight Shipping Agency Approvals TD 000450 01 A GXD 4 GXD 8 600 watts 1500 watts 800 watts 2250 watts 400 watts 800 watts 600 watts 1200 watts lt 195 THD 100 dB 1 2 Vrms 3 9 Vrms 33 5 dB 36 5 dB Class D Class D 3 4 Amps 6 2 Amps 2 9 Amps 5 6 Amps 1 6 Amps 3 2 Amps 0 7 dB 0 8 dB 1 25 dB 2 73 dB 100 20k balanced 10k unbalanced 23 5 dBu 3 pin XLR F 1 4 TRS balanced NL4 Chann Short circuit el 1 1 Channel 2 2 binding posts open circuit thermal RF prot
4. 00 B RESET gt ETR RESTORED TO DEFAULT RESTORED TO DEFAULT FACTORY RESET FACTORY RESET ENTER ENTER 4 B gt FACTORY RESET gt ET gt GED ENTER TO RESET Figure 40 Figure 41 TD 000450 01 A 11 DRAFT 2015 20 07 Preset Defaults The following settings apply to all factory presets Sensitivity 1 2 4dBu Crossover POLARITY EQ Band 1 GAIN 0 0 dB FREQUENCY 100 Hz BANDWIDTH 1 0 OCT EQ Band 2 GAIN 0 0 dB FREQUENCY 500 Hz BANDWIDTH 1 0 OCT EQ Band 3 GAIN 0 0 dB FREQUENCY 1000 Hz BANDWIDTH 1 0 OCT EQ Band 4 GAIN 0 0 dB FREQUENCY 5000 Hz BANDWIDTH 1 0 OCT Delay 0 00 MS M FT milliseconds meters and feet Limiter TYPE MEDIUM POWER 800 W 400 W IMP 80 Table 5 lists the unique factory default settings for each preset DSP Type Loudspeaker Type High Pass Filter Low Pass Filter Stereo Full Range Satellite P4 ST SAT Stereo I Range Satellite Stereo I Range Satellite ST gt e DSP p Stereo Range Satellite Stereo bwoofer P5 P7 ST SUB Stereo bwoofer ol Stereo bwoofer 2 er Monitor P8 P10 MONITORS Monitor Monitor Subwoofer ange od 13 5 Subwoofe Full Range Satellite ol 2 B gt Subwoofer Full Range Satellite 20 Hz 000 Hz 1000 Hz Bypass 20 Hz 1100 Hz 1100 H B z P14 P18 20 Hz 200 Hz 20 Hz 300 Hz Q 2 1500 Hz Bypass 20Hz 500 Hz 1500 Hz Bypass gt gt
5. In addition the Universal Power Supply used in the GXD helps to reduce weight Both amplifiers 2RU and are only 229 mm 9 inches deep The GXD 4 weighs in at 5 kg 11 165 the GXD 8 is at 5 9 kg 13 Ibs The GXD amplifiers have an LCD for control and monitoring with three buttons for menu navigation and two knobs for adjusting parameters There are 20 User Presets that can be edited stored and recalled to match any configuration or system Each channel has parallel XLR and 1 4 TRS connectors for inputs The outputs are professional NL4 and binding post connectors for mono and bi amp speaker connectivity You can keep your amplifier up to date with software updates using the USB connector Both amplifiers have complete loudspeaker processing Channel Gain amp Polarity 4th Order Linkwitz Riley Highpass and Lowpass Filters 4 band Parametric EQ 50 mSec of Alignment Delay E QSC Power Limiting DE Package Contents CH 1 Quick Start Guide TD 000449 00 3 IEC AC Power Cord AR 2 GXD Amplifier 4 USB Cable Rack Mount the Amplifier The GXD Series amplifiers are designed to be mounted in a standard rack mount unit The amplifiers are 2RU high and 229 mm 9 in deep 1 Secure the amplifier in the rack with four screws not included CAUTION Be sure that nothing is blocking the front or rear ventilation openings and that each side has a minimum of 2 cm clearance TD 000450 01 A 4 DRAFT 20
6. the apparatus Clean only with a dry cloth D 10 Keep ventilation opening free of dust or other matter not use this apparatus near water not submerge the apparatus in water liquids not block ventilation opening Install in accordance with the manufacturer s instructions 11 Do not install near any heat sources such as radiators heat registers stoves or other apparatus induding amplifiers that produce heat 12 To reduce the risk of electrical shock the power cord shall be connected to a mains socket outlet with a protective earthing connection 13 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 type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet 14 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 15 Do not unplug the unit by pulling on the cord use the plug 16 Only use attachments accessories specified by the manufacturer 17 Unplug this apparatus during lightning storms or when unused for long periods of time 18 Refer all servicing to qualified service personnel Servicing 15 required when the apparatus has
7. 15 20 07 Features Amplifier Front Panel 1 2 3 4 5 6 7 891011 Figure 1 1 Air Vents 5 Channel A CLIP red 2 Power Button 6 HOME Button 3 Channel A Signal Present green 7 ENTER Button 4 Channel A GAIN 8 EXIT Button 24 Amplifier Rear Panel Figure 2 cx 4 Figure 3 0 08 DE O DA CHA epe CHB me x C e e QSC AUDIO PRODUCTS LLC E P r monn son sos ESSEN x OUTPUTS TO PEAKERS UL 1 mmm EE _ INPUTS fr fuse y gm sur m o Eye y yc n mmm mM finu INPUT JONNECTOR PINS ER wr CLASS 2 CLASSE 2 10K UI NCED 175 TF RiNG SLEEVE M 4 OHM MIN IMPEDANCE PER CHANNEL 1 2 3 4 6 7 Figure 2 INPUJ CONNECTOR PINS 1 Channel I and Channel 2 Input XLRs female 2 Channel I and Channel 2 Input TRS female 3 USB Connector 4 Channel A Output Binding Posts TD 000450 01 A SPEAKER WIRE UTILISER IN CABLE CLASS 2 CLASSE 2 CAUTION DO NOT BRIDGE DUTPUTS L 4 OHM MIN IMPEDANCE PER CHANNEL 4 6 5 7 8 Figure 3 5 Channel A Output NL4 Connector 6 Channel B Output Binding Posts 7 Channel B Output NL4 Connector 8 Air Vents 5 DRAFT 2015 20 07 DO NOT CONNECT SPEAKER TERMINALS TO GROUND 12 PATENT INFO HTTP PATENTS QSC COM
8. 2 3 1 TIP RING SLEEVE Table 1 Power Output Table 2 WARNING power cord shall be connected to mains socket outlet with protective earthing connection See Figure 7 Connect the IEC power cord to the AC receptacle on the rear of the amplifier Push to reset Breaker when necessary Power Consumption Amplifier Voltage Current 100 240 VAC 6 3 A 3 1 A Frequency 50 60 Hz 50 60 Hz GXD 8 Table 3 TD 000450 01 A 6 DRAFT 2015 20 07 Figure 7 C Controls See Figure 8 1 Channel A CLIP indicator illuminates red when the input is high enough to cause the channel to clip 2 Channel A SIG signal present indicator illuminates green when there is a signal applied to the input 3 Power Switch LED on off Illuminates blue when on 4 Adjust Channel A GAIN 5 User Interface 1 A9 CLIP 2 SIG PROCESSING a HOME go to HOME screen view current PRESET b ENTER select highlighted item and or confirm parameter change EXIT return to previous screen and or undo parameter change P1 ST SAT FULL RANGE CLIP ot SIG Ox 7 GAIN DSP CONTROL AMPLIFIER STATUS OK 6 Adjust Channel B GAIN selects and adjusts controls 7 Ch
9. ES 1 Previous selection PRESETS 2 Currently selected STEREO DSP or DSP A and DSP B Figure 12 3 Next selection UTILITIES 4 Instructions Configurations There are four basic types of configuration selected by presets Figure 13 2 channels in stereo DSP 2 channels out Channel controls are linked audio signals are not combined P1 through P7 e Figure 14 2 channels in separate DSP 2 channels out Channel controls are not linked except sensitivity P8 through P10 e Figure 15 1 or 2 channels in separate DSP 2 channels out Channel controls are not linked except sensitivity P11 through P18 e Figure 16 or 2 channels in stereo DSP 2 channels out Channel controls are linked audio signals are combined P19 and P20 QH st H gt 3 ose HA 1 gt 1 ST 271259 gt QH ese EE 2 gt Q bud Figure 13 Figure 14 Figure 15 Figure 16 For ST stereo DSP presets the DSP functionality Crossover PEQ Delay Limiter controls are linked Sensitivity is always linked PRESET A preset configures the inputs and outputs along with setting the DSP When you make changes to the DSP you can save your setup in any of the 20 preset locations Refer to Preset Defaults on page 12 for the preset factory defaults Pl ST SAT FULLRANGE View Current Preset Configuration Oe s From HOME gt Cree 2 1 25 gt To return gt Cove HOME TO RETURN Figure 17
10. GXD Amplifier osc User Manual GXD 4 GXD 8 TD 000450 01 A C U SG EXPLANATION OF SYMBOLS The term WARNING indicates instructions regarding personal safety If the instructions are not followed the result may be bodily injury or death The term CAUTION indicates instructions regarding possible damage to physical equipment If these instructions are not followed it may result in damage to the equipment that may not be covered under the warranty The term IMPORTANT indicates instructions or information that are vital to the successful completion of the procedure The term NOTE is used to indicate additional useful information The intent of the lightning flash with arrowhead symbol in a triangle is to alert the user to the presence of un insulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to humans The intent of the exclamation point within an equilateral triangle is to alert the user to the presence of important safety and operating and maintenance instructions in this manual A IMPORTANT SAFETY INSTRUCTIONS A WARNING PREVENT FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT RAIN OR MOISTURE Read these instructions Keep these instructions Heed all warnings Follow all instructions D D Do not use any aerosol spray cleaner disinfectant or fumigant on near or into
11. PATENT INFO HTTP JPATENTS OSC COM 9 LCD Screen 10 Channel B Signal Present green 11 Channel B GAIN and function selection 12 Channel B CLIP red THIS AMPLIFIER SHOULD BE SUPPORTED ON ALL FOUR CORNERS WHEN INSTALLED IN A RACK OSC AUDIO PRODUCTS LLC COSTA MESA CA USA OUTPUT PWR PER CH IMP 120080 OHMS INPUT 100 240V 16 A 8 A 50 60 THIS AMPLIFIER SHOULD BE SUPPORTED ON ALL FOUR CORNERS WHEN INSTALLED IN A RACK 9 Circuit Breaker GXD 4 11 A GXD 8 20 A 10 Locking IEC Power Connection 11 Rear Rack mount Bracket 12 Front Rack mount Brackets Connections Inputs Channels 1 amp 2 See Figure 4 Input Impedance 20k ohms Balanced 10k ohms Unbalanced See Table 1 for wiring 1 XLR female 2 Va female TRS Phone Jack 3 USB Standard B connector Used for updating the amplifier firmware refer to the GXD User Manual 1 4 for details Outputs Channels A amp B See Figure 5 40 or 80 impedance XLR CAUTION Do not combine the audio outputs in any way Do not connect the audio outputs to ground 24 Wiring Be sure to observe polarity 4 connector See Figure 6 DE Binding Posts Use banana plugs or wire directly CHA iFr HF CHB Amplifier En Male NL4 Wiring 1 12 2 1 17 HF GXD 4 Outputs Figure 5 AC Power Connector CH1 7 zo INPUTS CH2 g PARALLEL Figure 4 Input Wiring POS NEG GROUND
12. al installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with 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 turning 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 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 TV technician for help Warranty For a copy of the QSC Limited Warranty visit the QSC Audio Products website at www qsc com TD 000450 01 A 3 DRAFT 2015 20 07 Introduction The GXD Class D amplifiers have been engineered for high performance output and optimized for maximum real world headroom into 4Q and 8Q loudspeaker systems The power levels of the GXD amplifiers are matched to the most popular loudspeakers GXD 4 per channel 400 W into 8Q and 600 W into 4Q 1600 W peak e GXD 8 per channel 800 W into 8Q and 1200 W into 4Q 4500 W peak The Class D amplifier topology is very efficient making the GXD amplifiers small and light
13. annel B SIG signal presence indicator illuminates green when there is a signal applied to the input 3 4 b 8 Channel CLIP indicator illuminates red when the input is high uoi enough to cause the channel to clip Figure 8 GXD Signal Flow Clip Digital Signal Processing DSP 1 dt ER Gain n Delay Limiter Meter n m Sensitivity i LCD Crossover LCD cid cu Gain Delay Limiter Meter ES Clip 1 Figure 9 Setup and Operation Menu Tree PRESET STEREO DSP DSP A DSP B UTILITIES PRESET RECALL SENSITIVITY SENSITIVITY STATUS PRESET SAVE CROSSOVER CROSSOVER CONTRAST PRESET SAVE AS EQ EQ TIMEOUT DELAY DELAY LOCKOUT TEREC DAP and DEP A DSPE LIMITER LIMITER RESET depend on the selected configuration 9 Figure 10 TD 000450 01 A 7 DRAFT 2015 20 07 Navigation Key Turn Knob B or A Select Press Adjust Home Screen See Figure 11 A puras d From any screen 100 1 Asterisk indicating an unsaved change to the preset 2 Currently active preset location and Figure 11 3 Output channel letter A and B 4 Limiter level indicator Channels A and B 5 LIMIT and CLIP indicators 6 Output meter A and B visual 7 Output gain digital range 100 to 10 dB Channels A and B 8 Amplifier STATUS Main Navigation Menu Pl ST SAT FULL RANGE See Figure 12 ga EE From HOME 8 3 TILITI
14. 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 19 The appliance coupler or the AC Mains plug is the AC mains disconnect device and shall remain readily operable after installation 20 Adhere to all applicable local codes 21 Consult a licensed professional engineer when any doubt or questions arise regarding a physical equipment installation TD 000450 01 A 2 DRAFT 2015 20 07 Maintenance and Repair WARNING Advanced technology e g the use of modern materials and powerful electronics requires specially adapted A maintenance and repair methods To avoid a danger of subsequent damage to the apparatus injuries to persons and or the creation of additional safety hazards all maintenance or repair work on the apparatus should be performed only by a QSC authorized service station or an authorized QSC International Distributor QSC is not responsible for any injury harm or related damages arising from any failure of the customer owner or user of the apparatus to facilitate those repairs FCC 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 A FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residenti
15. ection Load protected against DC faults 2 x Rotary Encoders 3 x Operatio nal buttons HOME ENTER EXIT 2 x Green Signal LEDs indicate signal presence 2 x Red A D Blue Power 2 2 x 1 0 Clip LEDs indicate input over drive and or amplifier current clipping LED ring AC on 256 x 128 pixel LCD High Pass Filter 4th order LR adjustable Frequency 20 Hz to 4 kHz Low Pass Fil Peak Limiter 89 mm 2 51 kg 113 70 kg 15 4 Ib UL CE RoH er 4th order LR adjustable Frequency 60 Hz to 4 kHz 4 band PEQ with variable Frequency Gain and Bandwidth with Power Aggressiveness and Impedance selection Delay 50 msec max U x 483 mm x 259 mm 3 5 x 19 x 10 2 Ib 6 0 kg 13 2 Ib 78 kg 173 Ib S WEEE compliant 13 DRAFT 2015 20 07 2015 QSC Audio Products LLC All rights reserved QSC and the QSC logo are trademarks of QSC Audio Products LLC in the U S and other countries All other trademarks are TD 000450 01 A OSC 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 qsc com F mail info qsc com ser
16. he hardware unit c FIRMWARE the version of the firmware installed on the amplifier 4 When finished gt 00e Contrast UTILITIES gt CONTRAST See Figure 35 1 From HOME gt CENTER CONTRAST TEST 2 0 Q gt UTILITIES gt ED gt CONTRAST gt ETE Figure 35 4 2 B 7 CONTRAST 0 to 10 gt Timeout UTILITIES TIMEOUT See Figure 56 TIMEOUT 1 MINUTE 1 From HOME gt EE oe te 2 0 Q gt UTILITIES gt ED 00 gt TIMEOUT gt ESD Figure 36 4 298 7 TIMEOUT NEVER 5 MINUTES 1 MINUTE or 30 SECONDS gt E Cove UTILITIES gt LOCKOUT UTILITIES gt LOCKOUT Lockout FOCkKOUTSUNEDCKED LOCKOUT UNLOCKED LOCKOUT LOCK DSP See Figure 37 through Figure 39 ALL FUNCTIONS WILL BE ALL DSP FUNCTIONS WILL 1 From HOME 3 AVAILABLE FOR EDITING BE LOCKED 5 LOCKOUT UNLOCK LOCKOUT LOCK DSP 2 0 Q gt UTILITIES gt ED Figure 37 Figure 38 5 O OB gt LOCKOUT gt EF 4 C UNLOCK LOCK DSP or LOCK ALL gt CER UTILITIES gt LOCKOUT LOCKOUT LOCK ALL 5 29 B UNLOCK LOCK DSP or LOCK ALL Cen Come ALL FUNCTIONS INCLUDING GAIN WILL BE LOCKED Reset Figure 39 See Figure 40 through Figure 41 8 1 From HOME gt Ee UTILITIES gt RESET UTILITIES gt RESET 2 B gt UTILITIES gt E ALL PRESETS AND ALL PRESETS AND SETTINGS WILL BE SETTINGS WILL BE
17. make are made in real time you hear the change as it Is being made NOTE The term STEREO DSP is used in this document as a generic term to mean either STEREO DSP or DSP A DSP B unless specifically noted DSP A B gt SENSITIVITY STEREO DSP gt SENSITIVITY SENSITIVITY SENSITIVITY 3 9V 448 0 6 SENSITIVITY 3 9V 14d8u See Figure 22 through Figure 24 1 From HOME gt EF 2 0 Q gt STEREO DSP gt ED Figure 22 Figure 23 3 Q gt SENSITIVITY gt GD 4 C2 8 7 12V 4 dBu or 3 9V 14 TOUCHMIX gt CED DSP A B gt SENSITIVITY SENSITIVITY TOUCHMIX Figure 24 TD 000450 01 A 9 DRAFT 2015 20 07 ON DH CROSSOVER AND POLARITY CROSSOVER gt HIGHPASS CROSSOVER gt LOWPASS See Figure 25 through Figure 27 0 1 From HOME gt E P X 2 0 Q B gt STEREO DSP gt Cere arms gt CROSSOVER gt EET Figure 25 Figure 26 4 Q OB gt gt ETT 5 He FREQUENCY BYPASS 20 Hz to 4 kHz gt EE CROSSOVER gt POLARITY 6 gt LPF gt EE 7 C2 B 7 FREQUENCY BYPASS 60 Hz to 4 kHz gt po gt ET 9 gt positive or negative gt Figure 27 EQ BAND 1 GAIN BAND 1 FREQUENCY See Figure 28 through Figure 30 12 aii a ali From HOME 12 12 OQ gt STEREO DSP gt E 005 EF
18. vice qsc com tech_support qsc com the property of their respective owners http patents qsc com 14 DRAFT 2015 20 07
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