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Professional Power Amplifier

User Manual

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Summary of Contents for 2650

Page 1: ...Professional Power Amplifier User Manual ...

Page 2: ...b Level controls 1 and 2 9 c Bridge switch 9 6 0 Indicators 10 A AC Present 10 B Operate 10 C Fault 10 D Temp 1 2 10 E Signal 10 F Clip 11 G Bridge 11 7 0 Typical applications 12 a Two channel stereo operation 12 b Two amplifiers used in bridge mode 12 c Two amplifiers for stereo with a mono sub bass 13 d Calculating Impedance 13 8 0 Glossary 14 9 0 Specifications 17 10 0 Troubleshooting 18 Checkl...

Page 3: ...grounding type plug has two blades and a third grounding prong The wide blade or the third prong is provided for your safety If the provided plug does not fit into your 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 u...

Page 4: ...mplifiers that are capable of maintaining excellent performance when being driven to their limit with real loudspeaker loads Sonic performance is always in the forefront of our minds and to this end the PULSE series represents the pinnacle of many years work with professional amplifiers PULSE amplifiers have impeccable technical specifications and extensive listening tests by many people with a wi...

Page 5: ...g air so fan filters will not normally be required If however the amplifier is to be used in an environment where the intake air might be excessively dirty optional external fan filters should be purchased from your dealer Fan filters should NOT be fitted unless there is likely to be a problem as they require regular cleaning to stop them getting clogged Clogged fan filters will result in the ampl...

Page 6: ...0 60Hz AC power Acceptable AC input supply voltage ranges from 180V to 265V The application of voltages above those specified may cause permanent damage that is not covered by your warranty Lower voltages may cause erratic operation Note that although the amplifier will operate correctly down to the voltages indicated the quoted output power will only be achieved with the stated nominal voltages I...

Page 7: ... pin 3 of the XLRs and the phone jack RING The removable terminal block earth symbol pin pin 1 of the XLR s and the Jack SLEEVE are internally connected to the chassis The screen of the input cable should always be connected to one of these points to ensure that EMC regulations are met The cable shield ground should also be connected to the equipment which is providing the input signal When feedin...

Page 8: ...e Bridge wiring Stereo wiring 1 1 A u d i o C o n n e c t i o n s 1 1 Bridge mono operation To use the amplifier in bridge mode for binding post connection the speakers must be connected between two RED terminals leaving the BLACK terminals unconnected In bridge mode the amplifier is non inverting relative to the 1 pin of the Speakon connector and the channel 1 RED binding post If the Speakon conn...

Page 9: ...ly 90dBu with the controls fully counter clockwise to 1dBu with the controls full clockwise 1dBu equals approximately 870mV RMS and this level will be just sufficient with a 4 ohm load and nominal AC voltage to drive the amplifier into clip If the amplifier is operated in bridge mode use the channel 1 level control only the channel 2 control has no effect Supplied with each PULSE amplifier are spe...

Page 10: ... Under some circumstances the Fault light might flash with a period of about 3 seconds along with the Power light and various clicking noises This is because the processor is trying to power up the amplifier but is detecting an error aborting and then retrying This may either continue indefinitely for example a shorted output in bridge mode or stop after a number of attempts D Temp 1 2 These light...

Page 11: ...low an impedance speaker load or any other mechanism that causes the output of the amplifier channel to not be as expected by the monitoring circuit Note that if the amplifier channel is muted by the microprocessor and a signal is applied the clip light will come on G Bridge If this light is on it indicates that the amplifier has been configured for bridge mode operation by the rear panel switch ...

Page 12: ... more information about how to calculate impedance b Two amplifiers used in bridge mode Here one amplifier is being used per channel As the amplifiers are being operated in bridge mode each is capable of delivering well over 1600W into 4 ohms or 1300W into 8 ohms More than one speaker may be used on each amplifier as long as the total impedance is not less that 4 ohms See section d for information...

Page 13: ...ve any impedance between an open circuit and 2 ohms when in stereo and between an open circuit and 4 ohms when bridged When more than 1 speaker is used it is easy to calculate the total impedance but remember that unless you are sure you know what you are doing all the speakers should be the same impedance If the speakers are wired in series just add their impedances together If they are in parall...

Page 14: ...er channels to make one channel capable of providing approximately twice the power into a single load This load must be connected across the two positive channel outputs Clip or Clipping The term used to describe an overdrive condition in a piece of equipment A clipped signal is distorted and will sound harsh Applying a heavily clipped signal to a loudspeaker whilst not unduly affecting the amplif...

Page 15: ... cycle per second is equal to 1Hz The audio band is generally restricted to frequencies of 20Hz to 20 000Hz 20kHz Frequency Response The equipment s relative gain compared to frequency Generally expressed as a certain number of dBs from 20Hz to 20kHz Impedance The AC equivalent of resistance and measured in ohms It indicates the amount of drive required for an input or the drive capability of an o...

Page 16: ...ch 10 times 20dB or so above the normal operating level of the audio equipment and may cause distortion if headroom is inadequate Speakon A type of connector manufactured by Neutrik with either 2 4 or 8 pole connectors specifically designed for connecting speakers to amplifiers PULSE amplifiers and the majority of loudspeakers use the 4 pole type XLR A type of connector used by audio professionals...

Page 17: ... 0 006 THD 1kHz 1dB below clip 22kHz measurement bandwidth Frequency Response 20Hz to 20kHz 0 0 2dB 2Hz to 120kHz 0 3dB Controls Power switch bridge mode switch indented level controls these may be made tamper proof Indicators AC Present Operate Signal Bridge Clip Temp Fault Protection Microprocessor supervised Over temperature DC on outputs output stage overload inrush current surge power fail an...

Page 18: ...k type Speakons are rotated in the socket Problem Distorted sound Check Are the Clip lights on Is any equipment before the amp being over driven Are any speaker cables shorted Are the loudspeakers too low an impedance Are the input cables wired correctly Problem Hum or buzzing Check Is the amp properly grounded Are the input cables shielded Are the input connectors properly wired Are you using an ...

Page 19: ...ot flashing The Operate and Fault light may be flashing very slowly accompanied by internal clicking A fault has been detected with one or more of the amplifier channels and the processor has shut down the power supply to protect both the amplifier and your speakers Depending on the fault it may try to resume operation again indefinitely or give up after a number of attempts If after disconnecting...

Page 20: ...ur amplifier This information is available on the Crown website or by contacting Crown Audio Customer Service see details panel 2 To ensure the safe transportation of your unit to the factory ship it in an original factory packing container If you don t have one call or write Crown s Parts Department With the exception of polyurethane or wooden crates any other Always use the original factory pack...

Page 21: ...ser the warranty period that the new Crown product is free of defects in materials 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 Warranty Period It does not cover any product wh...

Page 22: ...on of Harman International Industries Version 2 0 CB 190901 ZM10092 01 Crown Part Number 133784 1 Crown is a registered trademark of Crown International Other trademarks are the property of their respective owners ...

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