Crest_Audio_HD_Series_Owners_Manual电路图.pdf

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1、OWNERS MANUAL PROFESSIONAL POWER AMPLIFIERS Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Ch A Ch B Pr

2、otect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -

3、10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB RadioFans.CN 收音机爱 好者资料库 1. Save the carton and packing material even if the equipment has arrived in good condition. Should

4、you ever need to ship the unit, use only the original factory packing. 2. Read all documentation before oper- ating your equipment. Retain all doc- umentation for future reference. 3. Follow all instructions printed on unit chassis for proper operation. 4. Do not spill water or other liquids into or

5、 on the unit, or operate the unit while standing in liquid. 5. Make sure power outlets conform to the power requirements listed on the back of the unit. 6. Do not use the unit if the electrical power cord is frayed or broken. The power supply cords should be routed so that they are not likely to be

6、walked on or pinched by items placed upon or against them, paying particular atten- tion to cords and plugs, convenience receptacles, and the point where they exit from the appliance. 7. Always operate the unit with the AC ground wire connected to the electri- cal system ground. Precautions should b

7、e taken so that the means of ground- ing of a piece of equipment is not defeated. 8. Mains voltage must be correct and the same as that printed on the rear of the unit. Damage caused by connec- tion to improper AC voltage is not cov- ered by any warranty. 9. Have gain controls on amplifiers turned d

8、own during power-up to pre- vent speaker damage if there are high signal levels at the inputs. 10. Power down B. Objects have fallen, or liquid has been spilled into the equipment; C. The equipment has been exposed to rain; D. The equipment does not appear to operate normally, or exhibits a marked c

9、hange in performance; E. The equipment has been dropped, or the enclosure damaged. 22. To obtain service, contact your nearest Crest Audio Service Center, Distributor, Dealer, Crest Audio at 201.909.8700 (USA). Important Precautions This symbol is used to alert the oper- ator to follow important ope

10、rating procedures and precautions detailed in documentation. This symbol is used to warn opera- tors that uninsulated “dangerous volt- ages” are present within the equip- ment enclosure that may pose a risk of electric shock. RadioFans.CN 收音机爱 好者资料库 Crest Audio HD Series Power AmplifiersPage 3 Model

11、s HD2, HD4, HD6, HD9, HD12, HD18 Introduction Unpacking Installation and Mounting Front Panel Back Panel Internal Configuration and Control Operation Connecting Power / Circuit Size Requirements Cooling Requirements Connecting Inputs Connecting Outputs Mode Selection Stereo /Parallel/Bridged Mono Co

12、nnections TourClassProtection Features User Precautions Speaker Protection Recommended Speaker Cabling Maintenance User Responsibility Service and Repair 5 5 5 6 7 8 9 9 9 10 10 11 12 13 14 14 14 15 15 15 Power Amplifier Owners Manual Table of Contents Appendix ASpecifications Appendix BHD Block Dia

13、gram Appendix CWire Gauge Charts Appendix DRear Panel Symbols - Legend Appendix EHD18 Special Functions Appendix FWarranty Information RadioFans.CN 收音机爱 好者资料库 Page 4Crest Audio HD Series Power Amplifiers Models HD2, HD4, HD6, HD9, HD12, HD18 Ch A Ch B Protect Active Clip Signal Protect Active Clip S

14、ignal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB Front height 5.25 133mm Front width 19 / 483mm HD12, 18Front View Rear/Side ViewsHD2-9 (Top), HD12, HD18 (Bottom) Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB

15、Rear height 3.5 89mm HD2-9Front View Front width 19 / 483mm A A B AB A 1 3- 2+ + 5.25 133mm CA12 CA18 3.5 89mm CA2 CA4 CA6 CA9 17.9/437mm (19/483mm to rack ears) 1.375 35mm 18/457mm A A B AB A 1 3- 2+ + A A B B + + + A B B A A B A B B A + + + A A B B A B See appendix E for detailed drawing and infor

16、mation regarding model HD18 Introduction Congratulations on your purchase of a new HD Series professional power amplifier, and thank you for your confidence in Crest Audio products. You are among the growing number of audio professionals who have made Crest Audio one of the worlds leading suppliers

17、of professional and commercial/industrial audio sys- tems. For your safety, please read the Important Precautions section before installing and operating the amplifier. The Crest Audio HD Series is based on the same advanced circuit topologies that have made Crest ampli- fiers the choice of touring

18、professionals worldwide. HD Series amplifiers are designed for high operating efficiency and accurate sonic performance across the full audio bandwidth, even under stressful conditions. In order to maintain strict quality assurance standards, all HD Series amplifiers are built in Crests state-of- th

19、e-art USA manufacturing facility. Internal components are the finest available, and key sub-assemblies are pre-tested before final assembly. Finally, each amplifier is “burned in” and thoroughly tested (using preci- sion audio test equipment) before shipping. In addition, all HD Series amplifiers in

20、corporate Crests exclu- sive TourClass protection features to safeguard both internal circuitry and connected loudspeakers. This proven combination of advanced design, quality construction, and comprehensive circuit protection is your guarantee of fail-safe reliability. You can depend on consistent,

21、 stable performance even when your HD Series amplifier is subjected to punishing extremes in the most demanding fixed or mobile sound rein- forcement applications. Unpacking Please inspect the amplifier carefully immediately after unpacking. If you find any damage, notify your sup- plier/dealer imme

22、diately. Only the shipper may file a damage claim with the carrier for damage incurred during shipping. Be sure to save the carton and all packing materials for the carriers inspection. If your packing materials are in good condition, please save them. If you ever need to ship the unit back to Crest

23、 Audio or an authorized service center, you should use only the original factory packing. Installation and Mounting Four HD Series amplifiers are 2-rack-space units: models 2, 4, 6, and 9. The HD Series models 12 and 18 are 3-rack-spaces high. All mount in standard 19-inch racks. Four front-panel mo

24、unting holes are provided on each amplifier. Rear mounting ears give additional support, and use of rear supports is highly recom- mended in all mobile and touring sound systems. Optional rack-mount handles are available. Dimension drawings are included on page 4. Crest Audio HD Series Power Amplifi

25、ersPage 5 Models HD2, HD4, HD6, HD9, HD12, HD18 Front Panel 1. Rack Mounting Ears. Two front panel mounting holes are provided on each mounting ear. 2. Optional Rack Handles. Available from your authorized supplier. 3. Fan Outlet Grills. Granit Line amplifiers are cooled by two, rear-mounted fans. C

26、ool air flows over the heat sinks and exhausts through the front grills. Make sure these outlets remain clear to allow unrestricted air flow. 4. AC Power Switch/Circuit Breaker. Granit Line amplifiers have a front-panel combination AC switch and circuit breaker. (No fuses are used.) If the switch sh

27、uts off during normal use, push it back to the “ON” position once. If it will not stay on, the amplifier needs servicing. 5. Active LED. Indicates that AC power is connected and the amplifier is turned on. 6. Protect LED. Indicates that the channel is in Protect mode (speakers disconnected by output

28、 relay). 7. Clip LED. Illuminates at the clipping threshold. Continuous illumination also indicates that ACL (Active Clip Limiting) protection circuitry is engaged. 8. Signal LED. Illuminates to indicate that a signal (above a minimum threshold) is present at the amplifier input, and that the signal

29、 is being amplified. 9. Input Attenuators. Two input attenuators adjust level for their respective amplifier channels. In Bridged Mono Mode, both attenuators are used to control signal level and must be adjusted to the same setting. Page 6Crest Audio HD Series Power Amplifiers Models HD2, HD4, HD6,

30、HD9, HD12, HD18 Ch A Ch B Protect Active Clip Signal Protect Active Clip Signal -6 -10 -15 -30 -80 -3 -1 0dB -6 -10 -15 -30 -80 -3 -1 0dB 789123546 Never try to hold the circuit breaker/power switch in the “ON” position if it wont stay there itself! Rear Panel See Appendix E for information specific

31、 to model HD18. 10. Output Connectors Your amplifier is supplied with 5-way Output Binding Posts. Connection to the binding posts can be made with bare wire, banana plugs, or spade lug terminations. Make connections to both the Channel A and Channel B terminals for Stereo or Parallel Mode, or a sing

32、le connection across the red (“hot”) terminals only of Channels A and B for Bridged Mono Mode. See Appendix D and the section on Mode Selection for more information. NOTE: on the HD18, two pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is possible. 11. Mo

33、de Selection Switch. This recessed, three-position switch configures the amplifier for Stereo, Parallel or Bridged Mono Mode operation. Amplifiers are factory-configured for Stereo Mode. See Appendix D and the section on Mode Selection for more information. 12. Signal Ground Lift Switch. The recesse

34、d signal ground lift switch is factory-set to the ground (bottom) position, which electrically connects the signal ground to the chassis/AC ground. The top position lifts the amplifiers signal ground. In a properly designed system (for safety purposes and to minimize noise), the amplifier should be

35、connected to ground through the AC line cord. Also, whenever possible, the signal source equipment should share the same AC ground as the amplifier. In some cases this may not be possible, and a ground loop results. If this happens, the first step is to move the ground lift switch to the top (lift)

36、position. In this position, the signal ground is lifted and completely isolated from the chassis/AC ground. Do not change the switch to the lift position if the amplifier and the signal source equipment are on the same AC ground. Should the ground loop problem persist after the ground lift switch ha

37、s been set to the lift position, then the shield on bal- anced input lines should be grounded at one end only (usually the signal source). Crest Audio HD Series Power AmplifiersPage 7 Models HD2, HD4, HD6, HD9, HD12, HD18 Never connect a “hot” (red) output to ground or to another “hot” (red) output!

38、 RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS : RISQUE DE CHOC LECTRIQUENE PAS OUVRIR WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. ATTENTION! POUR VITER LE RISQUE DINCENDIE OU DE CHOC LECTRIQUE, NE PLACEZ PAS CET APPAREIL SOUS LA PLUIE OU LHUMIDIT

39、 CAUTION A A B AB A Designed the unused connectors may be used for “loop through” con- nection to other amplifiers. Note: Unbalanced “Tip/Sleeve” plugs may be used with the balanced TRS “Tip/Ring/Sleeve” connectors. The “ring” terminal or negative input will be connected to ground internally. When u

40、sing three-pole (stereo) TRS connec- tors, make sure that the ring connection is made either to the cold () output of the source equipment, or to ground. Incorrect connections may cause a 6dB loss in level. 15. Fan Inlet Ports this indicates that the temperature sensing circuits are operating normal

41、ly. The fan speed increases only as required by heat sink temperatures, keeping fan noise to a minimum. Under extreme thermal load, the fans will force a very large volume of air through the heat sinks. If either heat sink surpasses the maximum allowed temperature, the sensing circuit will open the

42、output relay, disconnecting the load from that channel. If the power transformer overheats, another sensing circuit opens both channel output relays until the transformer cools to a safe temperature. IMPORTANT: To ensure optimum cooling, periodically clean the amplifier fan filters (removable withou

43、t tools). Also make certain that there is enough space around the front of the amplifier to allow the cooling air to escape. If the amplifier is rack-mounted, do not use doors or covers on the front of the rack; the exhaust air must flow out without resistance. If the amplifiers are to be housed in

44、racks with closed backs, allow at least one (1) standard rack space of opening in the front of the rack for every four amplifiers. Crest Audio HD Series Power AmplifiersPage 9 Models HD2, HD4, HD6, HD9, HD12, HD18 Connecting Inputs. Use either the XLR or 1/4-inch input connectors on the rear to supp

45、ly audio signals to your Crest Audio HD Series amplifier. Both connectors accept balanced and unbalanced audio connections. (The HD Series amplifiers are configured standard with “Pin 2 hot” on XLR inputs. Please note that some other Crest Audio amplifiers are configured with “Pin 3 hot”). The unuse

46、d connector can be used to jumper the audio input to another amplifier input. For more information, see the sections on Balanced 1/4 (TRS) in addition, both must be adjusted to the same setting. Either the 1/4 (TRS) or XLR input may be used. NOTE: The channel B input connectors (XLR and/or TRS) may

47、be used to “Loop Thru” the channel A sig- nal when in parallel or bridged mono mode. Use extreme caution when operating the amplifier in Bridged Mono Mode. Never ground either side of the speaker cable when the amplifier is in Bridged Mono Mode; both sides are “hot.” If an output patch panel is used

48、, all connections must be isolated from each other and from the panel. The recommended minimum nominal load impedance in the Bridged Mono Mode is 4 ohms, which is the equivalent to driving both channels separately at 2 ohms. Driving bridged loads of less than the recommended minimums will activate t

49、he IGM circuitry, resulting in a loss of power, and may also lead to a thermal protect condition. See figures on page 12 showing output connection information. Crest Audio HD Series Power AmplifiersPage 11 Models HD2, HD4, HD6, HD9, HD12, HD18 Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment! Page 12Crest Audio HD Series Power Amplifiers Models HD2, HD4, HD6, HD9, HD12, HD18 A A B AB A 1 3- 2+ + A A B B + + + A B B A A B + + BB or A A or B A A A B AB A 1 3-