Crown 2650 manuale d’uso

P rofessional P ower Amplifier User Manual[...]

2 Contents Safety Information ................................................................................... 3 1.0 Introduction & Unpacking ..................................................................... 4 2.0 Mechanical Installation ........................................................................ 5 3.0 AC P ower Connection .[...]

3 DO NOT REMOVE COVERS. NO USER SER VICEABLE P AR TS INSIDE. REFER SER VICING T O QUALIFIED SER VICE PERSONNEL. THIS EQUIPMENT MUST BE GROUNDED. IT SHOULD NOT BE NECESSAR Y T O REMOVE ANY PROTECTIVE GROUND OR SIGNAL CABLE SHIELD CONNECTIONS T O PREVENT GROUND LOOPS. ANY SUCH DISCONNECTIONS ARE OUTSIDE THE RECOMMENDED PRACTICE OF CROWN AND WILL REND[...]

4 1.0 Introduction & Unpacking Front panel Rear panel Introduction The PULSE series of amplifiers are high performance professional power amplifiers capable of delivering major power output from a new generation of switched mode power supplies. All Pulse series amplifiers are housed in the same size 2U cases and feature light, powerful switchin[...]

5 2.0 Mechanical Installation A vertical rack space of 2U (88mm high) is required, with an in rack depth of 18.1 inches (460mm). The amplifier protrudes 1.6 inches (40mm) from the rack supports. If the unit is likely to undergo extreme vibration through trucking and touring, front rack ear reinforcement brackets and rear mounting plates must be fit[...]

6 3.0 AC P ower Connection W ARNING! THIS APPLIANCE MUST BE GROUNDED. The amplifier must always be connected to a 3-wire grounded AC outlet. The rack framework must also be connected to the same grounding circuit. The unit must NOT be operated unless the power cables' ground wire is properly terminated - this is important for personal safety a[...]

7 4.0 Audio Connections Inputs For each channel, there is a 1/4” phone jack socket, male & female XLR and pluggable removable terminal block connectors provided for signal input on the rear panel of the amplifier . Each is electronically balanced at an impedance greater than 10k ohms. The removable terminal block, phone jack and both XLR conn[...]

8 Outputs Both binding post and Speakon ® connectors are provided for each channel, these are internally wired in parallel so either or both may be used. Note that it is possible to lever the caps out of the ends of the binding posts to insert 4mm banana type plugs but this will invalidate the product safety approvals in some territories. The side[...]

9 5.0 Control oper ation a. P ower Switch P ressing this switch so that the white dot is closest to the front panel signals to the microprocessor that the user wishes to turn on the power supply . Note that the microprocessor will only switch the power supply on once it has assured that there are no internal faults. From the first application of AC[...]

10 6.0 Indicators A. AC Present This light glows when AC power is applied to the amplifier , whether or not the amplifier is actually running. This light will still glow even if the rear panel fuse is blown because it is powered from the separate, internally fused supply that powers the microprocessor . B. Oper ate Illuminated when the main power s[...]

11 Indicators... F . Clip This light is in fact rather more sophisticated than a simple clip indicator; it actually measures distortion. This may occur either due to clipping, trying to drive too 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[...]

12 7.0 T ypical applications a. T wo channel (stereo) operation In this example, each channel of the PULSE 2x650 is being used independently . For this application, ensure that the rear panel BRIDGE switches are in the NORMAL position. More than one speaker may be used on each channel as long as the total impedance is not less than 2 ohms. See sect[...]

13 T ypical applications... c. T wo amplifiers for stereo with a mono sub-bass Here T wo amplifiers are used with an active crossover to provide a separate sub-bass signal. d. Calculating Impedance Measured in ohms, impedance is a measure of AC resistance. Loudspeakers generally come in 16, 8 or 4 ohm varieties. Amplifiers have a lower limit to wha[...]

14 8.0 Glossary In this section many of the terms used throughout this manual are explained in more detail. Active Active electronic circuits are those which are capable of voltage and power gain by using transistors and integrated circuits. Amplitude R efers to the voltage level or intensity of a signal, and is usually measured in volts or decibel[...]

15 Glossary ... dBu or dBv The addition of a lower case ”u” or “v” after dB indicates an absolute scaling for the dB ratio. 0dBu (or 0 dBv) = 778mV or 0.778 V olts, and it has no regard for power or impedance. This term is widely used for expressing signal voltages in modern audio equipment with high input impedances and low output impedanc[...]

16 Glossary ... Removable terminal block One of the names given to a pluggable terminal block suitable for use with audio where connection to permanent wiring makes their use more suitable than XLR or Jack connectors. T r ansient A sudden burst of energy in an audio signal which only lasts for a small period of time relative to the rest of the sign[...]

17 9.0 Specifications P ower Ratings Pulse 2x650 Stereo Measured per channel, both channels driven at 1kHz to no more than 0.1% THD+N 8 ohms 400W rms 4 ohms 650W rms 2 ohms 850W rms * * Note: 2 ohm spec is at 1% THD Bridged Mono 16 ohms 800W rms 8 ohms 1300W rms 4 ohms 1700W rms* * Note: 4 ohm bridged spec is at 1% THD Input Sensitiv ity +1dBu for [...]

18 10.0 T roubleshooting Checklist Problem: No output Check: Are the AC Present and Operate lights on ? Are the F ault & T emp lights off ? Are the Signal lights on ? Are the level controls turned up? Are the speakers properly connected? (in particular check that older style ‘ring lock’ type Speakons are rotated in the socket). Problem: Dis[...]

19 T roubleshooting... Status Indication There is a microprocessor inside each PULSE amplifier responsible for monitoring all critical systems. The status of which are displayed on the front panel lights. Their indication is as follows: F ault and both T emp lights flashing The amplifier has just been plugged in and the microprocessor is carrying o[...]

20 Crown amplifiers are quality units that rarely require servicing. Before returning your unit for servicing, please contact Crown T echnical Support to verify the need for servicing. This unit has very sophisticated circuitry which should only be serviced by an authorized Crown Service Center .. This is one reason why each unit bears the followin[...]

WORLDWIDE EXCEPT USA & CANADA SUMMARY OF WARRANTY Crown International, 1718 West Mishawaka Road, Elkhart, Indiana 46517- 4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown 1 product, for a period of three (3) years from the date of purchase by the original purchaser (the “warranty period”) that th[...]

22 A division of Harman International Industries V ersion 2.0 CB 190901 ZM10092-01 Crown P art Number: 133784-1 Crown is a registered trademark of Crown International. Other trademarks are the property of their respective owners[...]