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CH and CL Series

Power Amplifiers

Operation Manual

7 Specifications

Figure 7.1

Models CH1 & CH2

Frequency Response

(Typical)

Figure 7.2

Model CL1 & CL2

Frequency Response

(Typical)

Figure 7.3

Models CH1, CH2, CL1 & CL2

Output Impedance

(Typical)

(CH1, CH2 Set To 4/8 Ohm Mode)

-6

+2

-4

-2

+0

d

B

r

20

20k

50

100

200

500

1k

2k

5k

10k

FREQUENCY (Hz)

8ohm
4ohm

«
...
29
30
31
32
33
...
»

Summary of Contents for CH Series

Page 1: ...tallation operation or maintenance The information provided in this manual was deemed accurate as of the publication date However updates to this information may have occurred To obtain the latest version of this manual please visit the Crown website at www crownaudio com Trademark Notice Crown Crown Audio Amcron and BCA are registered trademarks of Crown International Other trademarks are the pro...

Page 2: ...PMENT FROM THE AC MAINS DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTA CLE THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE WATCH FOR THESE SYMBOLS The lightning bolt triangle is used to alert the user to the risk of electric shock The exclamation point triangle is used to alert the user to important operating or maintenance instruc tions Important Safety Instructio...

Page 3: ...patibility Product Family Standard for Audio Video Audio Visual and Entertainment Lighting Control Apparatus for Professional Use Part 2 Immunity EN 61000 4 2 1995 Electrostatic Discharge Immunity Environment E2 Criteria B 4k V Contact 8k V Air Discharge EN 61000 4 3 1996 Radiated Radio Frequency Electromagnetic Immunity Environment E2 criteria A EN 61000 4 4 1995 Electrical Fast Transient Burst I...

Page 4: ...ation 14 3 1 Precautions 14 3 2 Indicators 18 3 3 Controls 18 4 Advanced Features and Options 19 4 1 Protection Systems 19 4 1 1 Power Circuit Breaker 19 4 1 2 Proportional speed or 3 speed Fan 19 4 2 Advanced Features 19 4 2 1 BCA CH4 and CL4 Only 19 4 2 2 Switching Power Supply with PFC CH4 and CL4 Only 19 4 3 Options 19 4 3 1 Input Sensitivity 19 4 3 2 Crown SST Modules 19 4 3 3 Fault Monitorin...

Page 5: ...or jobs where low impedance is the only requirement A red five way Fault LED for each channel blinks during amplifier power up and upon the following fault conditions exces sive heatsink temperature transformer thermal protection short at amplifier out put output stage non operational An RJ11 connector allows external circuits to monitor the status of the Fault circuit Detented level controls are ...

Page 6: ...ning of this manual 2 2 Install Your Amplifier CAUTION Before you begin make sure your amplifier is disconnected from the power source with the power switch in the off position and all level controls turned completely down counterclock wise Use a standard 19 inch 48 3 cm equipment rack EIA RS 310B See Figure 2 1 for ampli fier dimensions You may also stack amps without using a cabinet NOTE When tr...

Page 7: ...connectors You may use terminal forks or bare wire for your out put connectors see Figure 2 7 CH and CL Series amplifier ter minal strips accept up to 10 AWG terminal forks which fit over a 8 screw To prevent the possibility of short circuits wrap or otherwise insulate exposed loudspeaker cable and connectors Also a no touch cover which covers the terminal strips is provided to help prevent short ...

Page 8: ... actually deliver 140 volts WARNING The two Output Operation switches must be set to identical posi tions 4 8 ohm or 70V mode when oper ating in Bridge mode Never change switch positions with power turned on CAUTION Output Terminals are acti vated by selection of an output opera tion mode via the Output Operation switches All other Output Terminals are inactive For example when 4 8 Ohm Opera tion ...

Page 9: ...nnel 2 negative transformer lead to Channel 2 negative terminal Refer to Section 2 5 for output connector pin assign ments 2 7 2 Models CH1 CH2 140V Bridge Mode See Figure 2 11 In this example a 140V load is connected in Bridge Mono across the 70V termi nals of Channel 1 and Channel 2 Both Channel Operation Switches are set to 70V Make sure the Mode switch is set to the Bridge position NOTE When o...

Page 10: ...to Section 2 5 for output connector pin assignments 2 7 4 Model CH4 Bridge Mode See Figure 2 13 In this example a 4 8 ohm load is connected in Bridge Mono across the positive terminals of Channel 1 and Channel 2 Both Channel Operation Switches are set to 4 8 ohms Make sure the Mode switch is set to the Bridge position NOTE When operating in Bridge Mono mode turn down full CCW the level control for...

Page 11: ...15 In this example a 4 8 ohm load is connected in Bridge Mono across the positive terminals of Channel 1 and Channel 2 Make sure the Mode switch is set to the Bridge posi tion NOTE When operating in Bridge Mono mode turn down full CCW the level control for Channel 2 as the Channel 1 level control works both channels INPUTS Connect input wiring to Channel 1 OUTPUTS Connect positive speaker lead to ...

Page 12: ...igure 2 17 In this example a 4 8 ohm load is connected in Bridge Mono across the positive terminals of Channel 1 and Channel 2 Make sure the Mode switch is set to the Bridge posi tion NOTE When operating in Bridge Mono mode turn down full CCW the level control for Channel 2 as the Channel 1 level control works both channels INPUTS Connect input wiring to CH1 OUTPUTS Connect positive speaker lead t...

Page 13: ...round is an important safety feature Do not attempt to disable this ground connec tion by using an adapter or other methods Amplifiers don t create energy The AC mains volt age and current must be sufficient to deliver the power you expect You must operate your amplifier from an AC mains power source with not more than a 10 variation above or a 15 variation below the amplifier s specified line vol...

Page 14: ...ave may be your own 3 Do not short the ground lead of an output cable to the input signal ground This may form a ground loop and cause oscillations 3 Operation 4 WARNING Never connect the output to a power supply battery or power main Electrical shock may result 5 Tampering with the circuitry or making unau thorized circuit changes may be hazardous and invalidates all agency listings 6 Do not oper...

Page 15: ...ont Panel Controls and Indicators Figure 3 2 Models CH1 CH2 Back Panel Controls and Connectors Shown with No Touch Cover Removed SIGNAL SIGNAL CLIP CLIP FAULT FAULT POWER Power Switch OFF Position ON Position Power Indicator Channel 1 Signal Clip Fault Indicators Channel 2 Signal Clip Fault Indicators ...

Page 16: ...Series Power Amplifiers page 16 3 Operation Figure 3 3 Model CH4 Back Panel Controls and Connectors Shown with No Touch Cover Removed Figure 3 4 Models CL1 CL2 Back Panel Controls and Connectors Shown with No Touch Cover Removed ...

Page 17: ...page 17 CH and CL Series Power Amplifiers Operation Manual 3 Operation Figure 3 5 Model CL4 Back Panel Controls and Connectors Shown with No Touch Cover Removed 3 Speed Fan On Demand ...

Page 18: ...provides identical power output to each of the two amplifier output channels Bridge mode combines the two amplifier output channels into a single mono channel with twice the voltage of a single stereo channel It does this by bridging the outputs and it requires special output wiring Do NOT select Bridge mode without first making sure the amplifier has been wired in a Bridge Mono configuration For ...

Page 19: ...e amplifier was run as much as 12 dB into clip for extended periods of time 4 2 2 Switching Power Supply with PFC CH4 and CL4 Only Crown s new Switching Power Supply with PFC provides a range of benefits over both non switch ing and conventional switching power supply designs Typical non switching power supplies require large transformers in order to produce the required power at the output stage ...

Page 20: ...4632T Like the SST SBSC 3632T but for the JBL 4632T cinema speakers SST 4622 See Figure 4 1 This is a custom two channel crossover network with equalization specifically designed for use with JBL model 4622 ScreenArray cinema speaker systems installed in cinemas studio production and post production environments Features include Low frequency signals are internally routed to the channel one amplif...

Page 21: ...r has just been turned on and is in its turn on delay mode or the ampli fier is turned off If you choose to design your own circuit to interface this signal to your system note that this RJ jack is polarity sensitive Pin 2 must be grounded and Pin 5 must be supplied with a positive voltage pull up positive with respect to ground Refer to Figure 4 4 for RJ jack pin assignments The maximum signal th...

Page 22: ...70V 100V 0 full CCW 68 31 72 90 71 02 1 67 54 72 06 70 26 2 32 23 36 61 34 90 3 25 46 29 74 28 00 4 21 83 25 87 24 22 5 19 23 23 20 21 58 6 17 12 20 94 19 40 7 15 36 19 02 17 53 8 13 76 17 22 15 79 9 12 28 15 53 14 20 10 10 84 13 90 12 62 11 9 51 12 32 11 16 12 8 28 10 87 9 81 13 7 09 9 45 8 45 14 6 03 8 11 7 22 15 4 92 6 70 5 94 16 3 82 5 26 4 63 17 2 62 3 70 3 21 18 1 35 1 90 1 66 19 0 01 0 01 0...

Page 23: ...hm setting the filter is bypassed The signal next enters the main amplifier error amp where it is mixed with a small portion of the output signal in such a way as to control the amplifier s overall output performance Following the error amp is the LVA stage where the low voltage referenced signal gets trans lated to the output high voltage rails The last voltage amplifier in conjunction with a boo...

Page 24: ... any output current and further speeding a cool down cycle This point is set both to protect speakers and to guard against nuisance tripping Whenever the heatsinks or the transformer reach a maximum temperature or during the normal turn on delay window the front panel Fault Indicators will blink An RJ11 modular jack is mounted on the back panel Pins 2 and 5 are connected to an opto isolator which ...

Page 25: ...accomplished by an opto isolator that affects the gain in the signal path Next the signal enters a 32 kHz 7th Order Gaussian Low Pass Filter This filter prevents the modulator stage and the output filter both described below from receiving signals that are too high Without the 32 kHz filter the modulator would be unable to process signals that are too high and the output filter would not yield the...

Page 26: ...the width of the pulses is still dependent on the level of the input signal The positive and negative output PWM pulses then pass through inductors and are summed together Summing the output sig nals through inductors reconstructs the audio signal amplified to the desired level There is a small amount of ripple on the output that is at double the switching frequency 500 kHz The amplified audio sig...

Page 27: ...ed in order to sell the unit in certain parts of the world Since the CH4 CL4 is a worldwide product the EMI filter removes this noise so that it does not exit the box The power then enters the Power Factor Cor rection PFC Boost stage This stage is what allows the CH4 CL4 to be plugged into any outlet in the world without any modifications to the amplifier The PFC stage uses switching power supply ...

Page 28: ...he Clip LED is off the input signal is distorted Check gain staging and output lev els of the mixer or preamp 6 Troubleshooting CONDITION Fault indicator is flash ing POSSIBLE REASONS The amplifier has just been powered up and is not ready for operation yet The heatsinks are too hot Ensure ade quate cooling Remove excessive loads The transformer high voltage power sup ply thermal protection is act...

Page 29: ...ominally balanced nominally unbalanced 20 kilohms 10 kilohms 20 kilohms 10 kilohms 20 kilohms 10 kilohms Load Impedance Note Safe with all types of loads Stereo Bridge Mono 4 8 and 16 ohm 70V 8 16 and 32 ohms 140V 4 8 and 8 ohm 70V 8 16 and 16 ohms 140V 4 8 and 4 ohm 70V 8 16 and 8 ohm 140V Voltage Gain at maximum level setting 1 kHz 1 4V sensitivity 4 8 Ohm Operation 70V Operation 30 5 dB 34 0 dB...

Page 30: ... Shorted input 10 mV 10 mV 10 mV Input Impedance nominally balanced nominally unbalanced 20 kilohms 10 kilohms 20 kilohms 10 kilohms 20 kilohms 10 kilohms Load Impedance Note Safe with all types of loads Stereo Bridge Mono 2 4 8 ohm 4 8 16 ohm 2 4 8 ohm 4 8 16 ohm 2 4 8 ohm 4 8 16 ohm Voltage Gain at maximum level setting 1 kHz 1 4V sensitivity 4 8 Ohm Operation 30 5 dB 32 1 dB 34 0 dB Required AC...

Page 31: ...tions Figure 7 1 Models CH1 CH2 Frequency Response Typical Figure 7 2 Model CL1 CL2 Frequency Response Typical Figure 7 3 Models CH1 CH2 CL1 CL2 Output Impedance Typical CH1 CH2 Set To 4 8 Ohm Mode 6 2 4 2 0 d B r 20 20k 50 100 200 500 1k 2k 5k 10k FREQUENCY Hz 8ohm 4ohm ...

Page 32: ...Operation Manual CH and CL Series Power Amplifiers page 32 Figure 7 4 Models CH4 CL4 Frequency Response Typical Figure 7 5 Models CH1 CH2 CL1 CL2 Damping Factor Typical CH1 CH2 Set To 4 8 Ohm Mode ...

Page 33: ...page 33 CH and CL Series Power Amplifiers Operation Manual Figure 7 6 Models CH4 CL4 Damping Factor Typical Figure 7 7 Models CH4 CL4 Output Impedance Typical ...

Page 34: ...ycle of highly compressed rock n roll midrange is 40 Duty cycle of rock n roll is 30 Duty cycle of background music is 20 Duty cycle of continuous speech is 10 Duty cycle of infrequent short duration paging is 1 Here are the equations used to calculate the data presented in Figures 8 1 8 2 and 8 3 The value used for Power Factor is 0 83 for CH1 CH2 CL1 and CL2 models and 0 98 for CH4 and CL4 model...

Page 35: ...s Operation Manual 8 AC Power Draw and Thermal Dissipation Figure 8 1 Model CH1 Power Draw Current Draw and Thermal Dissipation at Various Duty Cycles Figure 8 2 Model CH2 Power Draw Current Draw and Thermal Dissipation at Various Duty Cycles ...

Page 36: ...Amplifiers page 36 8 AC Power Draw and Thermal Dissipation Figure 8 3 Model CH4 Power Draw Current Draw and Thermal Dissipation at Various Duty Cycles Figure 8 4 Model CL1 Power Draw Current Draw and Thermal Dissipation at Various Duty Cycles ...

Page 37: ...HMS BRIDGE 4 OHMS DUAL 8 OHMS BRIDGE 296 1419 5 4 10 8 1075 260 1175 4 4 8 8 872 235 993 3 4 6 7 669 174 690 2 4 4 7 466 113 448 1 3 2 6 263 237 2 OHMS DUAL 4 OHMS BRIDGE 142 563 1 8 3 6 360 232 922 3 3 6 6 660 323 1281 4 8 9 6 960 413 1639 6 3 12 6 1260 504 1998 7 8 15 6 1560 940 3 4 6 7 675 200 793 2 8 5 5 552 163 646 2 2 4 3 429 126 499 1 6 3 1 306 89 352 1 4 1 8 183 8 AC Power Draw and Thermal...

Page 38: ... being sent to the factory for service Please complete the SRA by going to www crownaudio com support factserv htm If you do not have access to our website call 1 800 342 6939 extension 8205 and we ll create the SRA for you 2 See packing instructions that follow 3 Ship product to CROWN AUDIO FACTORY SERVICE 1718 W MISHAWKA RD ELKHART IN 46517 4 Use a bold black marker and write the SRA number on t...

Page 39: ...nter or our factory All expenses in remedying the defect including surface shipping costs in the United States will be borne by us You must bear the expense of shipping the product between any for eign country and the port of entry in the United States including the return shipment and all taxes duties and other customs fees for such for eign shipments HOW TO OBTAIN WARRANTY SERVICE You must notif...

Page 40: ... est insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase War ranty work can only be performed at our autho rized service centers We will remedy the defect and ship the product from the service center within a reasonable time after receipt of the defec tive product at our authorized service center HOW TO OBTAIN WARRANTY ...

Page 41: ...__ E mail address ___________________________________________ Phone include area code ___________________________ Fax __________________________________ MODEL SERIAL PURCHASE DATE ie MA3600VZ CE1000A PCC160 mo day yr ________________________________ ____________________ ______ _____ _____ ________________________________ ____________________ ______ _____ _____ ________________________________ ____...

Page 42: ...Operation Manual CH and CL Series Power Amplifiers page 42 THIS PAGE INTENTIONALLY LEFT BLANK ...

Page 43: ..._____________________________________________________________________________________________________________________________________________ Other equipment in your system ___________________________________________________________________________________________________________________________________________________________________________ If warranty is expired please provide method of payment...

Page 44: ......

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