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Crown CP660 Reference Manual Download Page 7

Page 7

CP660

Six Channel Amplifier

Reference Manual

2 Controls, Indicators and
Connectors

Signal Indicators

Six green signal indicators show the presence of signal
at the corresponding channel’s loudspeaker connec-
tion.

Clip Indicators

Six yellow clip indicators are provided. These will light
when distortion is audible on the amplifier output of the
corresponding channel

.

Fig. 2.1 Front Controls, Indicators and Connectors

Power Indicator

The green power indicator turns on when the CP660
has been turned on and has power.

Power Switch

The power switch is located on the front panel so you
can easily turn the amplifier on or off. When the switch
is depressed left, the amp is off. If you ever need to
make any wiring or installation changes, remember to
also disconnect the power cord.

eration mode. If the maximum operating temperature
is exceeded, this light remains on while the amplifier
cools down.

Temp Indicator

Typically unlit to signal normal operating conditions.
This red LED will turn on when the temperature of the
amplifier gets too high and the fan is in full-speed op-

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Summary of Contents for CP660

Page 1: ...9 294 8200 CP660 amplifiers are produced by the Professional Audio Division of Crown International Inc Trademark Notice Crown and Amcron are registered trademark of Crown International Inc Other trademarks are the property of their respective owners CP660 Some models may be exported under the name Amcron ...

Page 2: ...eriodofthree 3 yearsfromthedateofpurchasebytheoriginalpurchaser the warrantyperiod thatthenewCrownproductisfreeofdefectsinmaterials and workmanship We further warrant the new Crown product regardless of the reason for failure except as excluded in this Warranty ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the...

Page 3: ...r outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with a cart stand bracket or table specified by the manufacturer or sold with the apparatus When a...

Page 4: ...of design production or variations of the equipment Nor does it cover every possible situation which may arise during installation operation or mainte nance If you need special assistance beyond the scope of this manual please contact our Technical Support Group Crown Audio Division Technical Support Group Plant 2 SW 1718 W Mishawaka Rd Elkhart Indiana 46517 U S A Phone 800 342 6939 North America ...

Page 5: ...ions 15 4 2 Indicators 15 4 3 Protection 15 4 4 Controls 16 5 Other Issues 17 5 1 Solving Input Problems 17 5 2 Solving Output Problems 18 6 Applications 19 6 1 Introduction 19 6 2 Restaurant Bar 19 6 3 Meeting Hall 20 6 4 Surround Sound Environment 22 6 5 Courtroom 23 6 6 Conclusion 24 7 Specifications 25 7 1 Power 26 7 2 Controls 26 7 3 Indicators 26 7 4 Input Output 26 7 5 Output Signal 26 7 6 ...

Page 6: ...series of speakers using constant volt age lines Also for your protection please send in your warranty registration card today and save your bill of sale as it is your official proof of purchase 1 1 Unpacking Please unpack and inspect your new amplifier for any damage that may have occurred during transit If dam age is found notify the transportation company imme diately Only you the consignee may...

Page 7: ... The green power indicator turns on when the CP660 has been turned on and has power Power Switch The power switch is located on the front panel so you can easily turn the amplifier on or off When the switch is depressed left the amp is off If you ever need to make any wiring or installation changes remember to also disconnect the power cord eration mode If the maximum operating temperature is exce...

Page 8: ...trols Located on the back panel above the output connec tors these controls allow for adjustment of each channel s level volume These can be used for sys tem balancing and gain optimization To decrease the level turn the control counter clockwise To increase the level turn the control clockwise Balanced Barrier Block Inputs The inputs are standard balanced barrier block inputs Each input includes ...

Page 9: ...l six channels so be sure to note any special wir ing requirements for the configuration you will be using If one or more combined channels is required by your sys temdesign anyadjoiningpairofoutputs 1 2 3 4 5 6 can beconfiguredforaBridgemodeofoperation Toconfigure your amp for Bridge mode start by removing power from the unit Next simply slide the switch on the appropriate channels into Mono posi...

Page 10: ...elect Mono mode on the channels you desire by sliding the Dual Mono switch to the MONO right posi tion Both outputs will receive the signal from the odd numbered channel with the output of the even num bered channel inverted so it can be bridged with the odd numbered channel s output DO NOT USE THE EVEN NUMBERED CHANNEL S INPUT or the signal level and quality may be greatly degraded Also keep the ...

Page 11: ... amplifier Mark this value on the Load Resistance line of the nomo graph 2 Select an acceptable damping factor and mark it on the Damping Factor line Higher damping factors yield lower distortion and greater motion control over the loudspeakers A common damping factor for commercial applications is between 50 and 100 Higher damping factors may be desirable for live sound but long cable lengths oft...

Page 12: ... for cable length or damping factor in the nomograph For option 3 estimate the effective wire gauge by subtracting 3 from the apparent wire gauge every time the number of conductors of equal gauge is doubled So if 10 wire is too large two 13 wires can be substituted or four 16 wires can be used for the same effect Fig 3 4 Wire Size Nomograph 40 30 20 15 10 9 8 7 6 5 4 3 2 1 2 5 10 20 50 100 04 06 ...

Page 13: ...otection when the woofers are protected by slow blow fuses and high frequency drivers are protected by high speed instrument fuses Fig 3 5 Loudspeaker Fuse Nomograph 1 0 1 2 1 4 1 6 2 5 3 4 5 6 7 8 9 10 12 14 16 20 25 30 20 15 10 8 6 5 4 3 2 1 5 1 8 6 5 4 3 2 15 1 08 3000 2000 1500 1000 800 600 400 300 200 150 100 80 60 40 30 20 15 10 8 6 4 3 2 1 5 1 SPEAKER Z ohms FUSE amps SPEAKER RATING PEAK MU...

Page 14: ...pecifications in this manual were measured using 120 VAC 60 Hz power unless otherwise noted Speci fications are derived using a mains voltage that is accu rate to within 0 5 with THD less than 1 0 under all testing conditions Performance variations can occur at other AC voltages and line frequencies In addition line regulation problems will directly affect the output power available from the ampli...

Page 15: ...or making unauthorized circuit changes may be haz ardous and invalidates all warranties Remember Crownisnotliablefordamagethatresultsfrom overdriving other system components 4 2Indicators The front panel of a CP660 amplifier has several helpful indicators ThegreenPowerindicatorshowsthattheam plifier has been turned on or enabled The yellow Clip indicators turn on when distortion is au dibleontheam...

Page 16: ...ted only the odd numbered channel s level control will work 4 4 Controls The Powerswitchislocatedonthefrontpanelsoyoucan easilyturntheamplifieronandoff Ifyoueverneedtomake any wiring or installation changes don t forget to discon nect the power cord Please follow these steps when first turning on your amplifier 1 Turn down the level of your audio source For ex ample set your mixer s volume to 2 Tu...

Page 17: ...rs To prevent high levels of input RF install an appropriate low pass filter in series with the input signal as shown in Fig 5 1 A third problem to avoid is hum The two most common sources of hum in an audio system are inductive cou pling and ground loops Inductive coupling can occur when input cables are subjected to a magnetic field from a power cord or power transformer One way to prevent induc...

Page 18: ...ic currents when primarily inductive loads are used Examples of inductive loads are 70 volt trans formers and electrostatic loudspeakers Inductive loads can appear as a short circuit at low fre quencies This can cause the amplifier to produce large low frequency currents and activate its protection cir cuitry Always take the precaution of installing a high pass filter in series with the amplifier ...

Page 19: ...e be sure to read the installation and operation sections of this manual before proceeding 6 2 Restaurant Bar The distributed sound systems of restaurants pose unique challenges to sound system designers Is there a way to get one style of music to the waiting area and restaurant at one level and a different style to the bar at another level Can we get our paging system into the waiting area and ba...

Page 20: ...desired in other areas such as auxiliary rooms dressing rooms or hallways Monitor mixes are common in any size hall The CP660 can help with all these situations We have prepared two diagrams to help with some meeting hall applications One is based on a larger hall situation Fig 6 2 and one on a smaller situation Fig 6 3 Fig 6 2 Large Meeting Hall Application Voltage Controller Attenuator ...

Page 21: ...Page 21 CP660 Six Channel Amplifier Reference Manual Fig 6 3 Small Meeting Hall Application ...

Page 22: ... configuration that has been diagrammed in Fig 6 4 is based on a Dolby Pro Logic setup where the rear speakers are powered from just one channel and the sub woofer is powered from two channels bridged together If you run your system so your rear speakers are in stereo just take one of the outputs that was dedicated to the sub woofer make sure you are no longer in Mono Mode and apply it to your oth...

Page 23: ...hard to think of a situation where listening is as critical as it is in a courtroom The CP660 can provide sound distribution to the defense prosecution jury gallery and judge Fig 6 5 shows one way to configure a system for a courtroom situation Fig 6 5 Courtroom Application ...

Page 24: ...s we have shown are just a small example of the many uses for the Crown CP660 Power Amplifier From amusement parks to zoos theaters to small clubs the CP660 can fill the need Please call Crown Technical Support if you need more information on configuring your system with the CP660 ...

Page 25: ...z 3 3 amps typical 100 V 50 Hz 7 8 amps typical 7 2 Controls Power A front panel rocker switch used to turn the amplifier on and off Level A back panel Level control for each channel Dual Mono A 2 position back panel switch used to se lect Dual or Mono operation 7 3 Indicators Power The green power indicator turns on when the CP660 has been turned on and has power Signal Indicators Each channel ha...

Page 26: ... gerous turn on transients 7 7 Construction Durable black powdercoat finish on the steel chassis front panel Lexan overlay with flow through ventilation from front to back panels Cooling Variable speed fan with auto trigger Dimensions 19 inch 48 3 cm standard rack mount width EIA RS 310 B 123 4 inch 32 3 cm depth be hind mounting surface and 31 2 inch 8 9 cm height Approximate Weight Center of gra...

Page 27: ...Page 27 CP660 Six Channel Amplifier Reference Manual Fig 7 1 Frequency Response Fig 7 2 Phase Response ...

Page 28: ... and the defective unit to the Crown factory For warranty service we will pay for ground shipping both ways in the United States after receiving copies of the shipping receipts Shipments should be sent UPS ground If the unit is under warranty you may send it C O D for the cost of freight via UPS ground The fac tory will return it via UPS ground Please contact us if other arrangements are required ...

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