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1、PROFESSIONAL POWER AMPLIFIERS OWNERS MANUAL Including MA Series Amplifiers Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch A -1 0dB -3 -6 -10 -15 -30 -80 8001 Professional Power Amplifier Clip/Limit Signal Temp/DC Active Clip/Limit Signal Temp/DC Active HIGHS -1 0dB -3 -6 -10 -15 -30 -80 7301 Professional Powe
2、r Amplifier LOWS -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active Ch B -1 0dB -3 -6 -10 -15 -30 -80 7001 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch A -1 0dB -3 -6 -10 -15 -30 -80 MA9130 Professional Power Amplifier Clip/Limit Sign
3、al Temp/DC Active Clip/Limit Signal Temp/DC Active MA7120 Professional Power Amplifier Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch A -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active MA5850 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Ch B -1 0dB -3 -6 -10 -15 -30 -80 Clip/Lim
4、it Signal Temp/DC Active Ch B -1 0dB -3 -6 -10 -15 -30 -80 6001 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active Ch B -1 0dB -3 -6 -10 -15 -30 -80 4801 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active Ch B
5、-1 0dB -3 -6 -10 -15 -30 -80 4601 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active 3301 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80 Ch B -1 0dB -3 -6 -10 -15 -30 -80 10004 Professional Power Amplifier Ch A -1 0dB -3 -6 -10 -15 -30 -80
6、 Ch D -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch C -1 0dB -3 -6 -10 -15 -30 -80 Clip/Limit Signal Temp/DC Active Clip/Limit Signal Temp/DC Active 10001 Professional Power Amplifier Clip/Limit Signal Temp/DC Active Ch A -1 0dB -3 -6 -10 -15 -30
7、-80 Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch B -1 0dB -3 -6 -10 -15 -30 -80 Ch A -1 0dB -3 -6 -10 -15 -30 -80 9001 Professional Power Amplifier Clip/Limit Signal Temp/DC Active RadioFans.CN 1. Save the carton and packing material even if the equipment has arrived in good condition. Should you ever need
8、to ship the unit, use only the original factory packing. 2. Read all documentation before oper- ating your equipment. Retain all docu- mentation for future reference. 3. Follow all instructions printed on unit chassis for proper operation. 4. Do not spill water or other liquids into or on the unit,
9、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 walked on or p
10、inched 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 be taken so tha
11、t the means of grounding 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 down during power
12、-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 change in perform
13、ance; E. The equipment has been dropped, or the enclosure damaged. 22. To obtain service, contact your nearest Crest Audio Service Center, Distributor, Dealer, or Crest Audio at 201.909.8700 (USA). All Professional Series power amplifier models are UL LISTED, except for: 10001 10004 MA5850 MA7120 MA
14、9130 Important Precautions This symbol is used to alert the oper- ator to follow important operating pro- cedures 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 ri
15、sk of electric shock. RadioFans.CN Crest Audio Pro Series Power AmplifiersPage 1 Power Amplifier Owners Manual Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Mounting .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Cooling Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3 Operating Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . 3 Crest Audio Model 7301 Power Amplifier . . . . . . . . . . 3 Crest Audio Model 10
17、004 Power Amplifier . . . . . . . . . 3 Models 3301, 4801, 6001 Features . . . . . . . . . . . . . . . . 4 Model 4601 Features . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Model 7001 Features . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Model 7301 Features . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . 5 Model 8001 Features . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Model 9001 Features . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Model 10001 Features . . . . . . . . . . . . . . . . . . . . . . . . . 8 Model 10004 Features . . . . . . . . . . . . . . .
19、 . . . . . . . . . . 9 Connecting Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Connecting Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Crest Audio Octal Sockets . . . . . . . . . . . . . . . . . . . . . 10 NexSys. . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . 10 Connecting Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Bridging Precautions . . . . . . . . . . . . . . . . . . . . . . . . . 12 Switches and Controls . . . . . . . . . . . . . . . .
21、 . . . . . . . . 12 Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Protection Features. . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Speaker Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Amplifier Maintenance and User Responsibility
22、. . . . . 15 Service/Warranty Information. . . . . . . . . . . . . . . . . . . 15 Professional Series Block Diagram . . . . . . . Appendix A General Amplifier Specifications . . . . . . . . . Appendix B Wire Gauge Charts. . . . . . . . . . . . . . . . . . . . Appendix C Meyer-Compatible Power Amplif
23、iers. . . . . . Appendix D RadioFans.CN Page 2Crest Audio Pro Series Power Amplifiers Introduction Congratulations.on your purchase of a Crest Audio Professional Series power amplifier. Designed for years of reliable, flawless oper- ation under rigorous use. These power amplifiers offer the sonic su
24、periority and unsurpassed reliability for which Crest Audio is famous, while remaining surprisingly compact. Advanced technology and extensive protection circuitry allow operation with greater efficiency into difficult loads and power conditions. All Professional Series amplifiers are fully compatib
25、le with Crest Audios Octal Socket Accessories and the NexSys computer-controlled audio system. The IGM (Instantaneous Gain Modulation) circuit ensures trou- ble-free operation into loads as low as 2. The clip limiting circuits protect drivers and ensure that sonic integrity is maintained, even in ex
26、treme overload conditions. Crest Audios high-efficiency design uses tunnel-cooled heatsinks and variable speed DC fans. This cooling topology maintains a lower overall operating temperature, resulting in longer output transistor life. Model 9001, 10001, and 10004 power amplifiers use Crest Audios in
27、novative “Power Density” circuitry. Although the Crest Audio Professional Series amplifiers are quite simple to operate, and are housed in ultra-strong steel chassis, improper use can be dangerous. Some of these models are very high-powered amplifiers that can put out high voltages and sizable cur-
28、rents at frequencies up to 30 kHz. Always use safe operating techniques with these amplifiers. FOR YOUR SAFETY, READ THE IMPORTANT PRECAUTIONS SECTION , AS WELL AS INPUT, OUTPUT, AND POWER CONNECTION SECTIONS. Unpacking Upon unpacking, inspect the amplifier. If you find any damage, notify your suppl
29、ier immediately. Only the consignee may institute a claim with the carrier for damage incurred during shipping. Be sure to save the carton and all packing materials. Should you ever need to ship the unit back to Crest Audio, one of its offices, service centers, or the supplier, use only the original
30、 factory packing. If the ship- ping carton is unavailable, contact Crest to obtain a replacement. Mounting Professional Series power amplifiers will mount in standard 19-inch racks having sufficient depth. The 10004 the 9001 and 8001 models are three rack-spaces high, while the remainder are two rac
31、k-space units. All two and three-rack space units (except for the 9001) are provided with four front panel mounting holes. The 9001, 10001, and 10004 have eight front panel mounting holes. Crest Audio recommends using all mounting holes to secure the power amplifier in the rack; this will ensure the
32、 safety of the equipment. Rear mounting ears are also provided on all amplifiers for additional support, which is essential in non-permanent installations like mobile or touring sound systems, but recommended for permanent installations as well. Because of the cables and connectors on the rear panel
33、, a right-angle or offset screwdriver or hex key will make it easier to fasten the rear mount- ing ears to the rails. Note: The 10001 and 10004 models, because of their size, require rack mounting screws stronger than standard rack screws. For cus- tomers in the USA, these are supplied with the unit
34、. Customers in Europe and Asia should mount these models using heavy-duty met- ric bolts. RadioFans.CN Crest Audio Pro Series Power AmplifiersPage 3 Cooling Requirements The Professional Series amplifiers use a forced-air cooling system to maintain a low, even operating temperature. Air is drawn int
35、o the amplifier by fan(s) on the rear panel, courses through the cooling fins of the back-to-back (tunnel-configured) channel heat sinks, and then exhausts through the front panel slots. If either heat sink gets too hot, its sensing circuit will open the output relay, disconnecting the load from tha
36、t particular channel. If the power transformer overheats, another sensing circuit opens the output relays on all channels until it cools to a safe temperature. It is important to have an adequate air supply at the back of the amplifier and enough space around the front of the amplifier to allow the
37、cooling air to escape. If the amp is rack mounted, do not use doors or covers on the front of the rack; the exhaust air must flow without resistance. If you are using racks with closed backs, use fans on the rear rack panel to pressurize the rack and ensure an ample air supply; also make sure that t
38、here is one (1) standard rack space opening for every three mounted power amplifiers. The Professional Series amplifiers are supplied with cooling fan air filters. The filters snap in place over the fan housing. Any filter will decrease airflow somewhat, so use the filter only when the amplifier is
39、used in a dusty environment without a filtered air supply. The filter element must be cleaned or replaced periodically (see the section on Amplifier Maintenance for filter service procedures). Operating Precautions Make sure the mains voltage is correct and is the same as that printed on the rear of
40、 the amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any warranty. See the Connecting Power section for more information on voltage requirements. Note: Always turn off and disconnect the amplifier from mains voltage before making audio connections. Also,
41、 as an extra precaution, have the attenuators turned down during power-up. Although the Professional Series amplifiers have AutoRamp circuitry, which raises the signal level gradually after the output relay clos- es, it is always a good idea to have the gain controls turned down during power-up to p
42、revent speaker damage if there is a high signal level at the inputs. Whether you buy or make them, use good-quality connections, input cables, and speaker cables, along with good soldering technique, to ensure trouble-free operation. Most intermittent problems are caused by faulty cables. Consult th
43、e Wire Gauge Charts to determine proper gauges for different load impedances and cable lengths. Remember that cable resis- tance robs amplifier power in two ways: power lost directly to resistance (I2R loss), and by lowering the total load impedance. Also make sure the mode switch is correctly set f
44、or the desired application. See Sections on Stereo, Parallel, and Bridged Mono Operation for more information. The Crest Audio Model 7301 Power Amplifier The Model 7301 is specifically designed for use in bi-amplified systems; because of its dissimilar channel design, the specifications are reported
45、 in a separate fashion. The 7301 power specifications were obtained by driving the low frequency channel with a 100 Hz signal and the high frequency channel with a 1 kHz signal. The Crest Audio Model 10004 Power Amplifier The Model 10004 power amplifier is unique in that it is a high-power, four-cha
46、nnel amplifier. Offering the advantages of Crest Audios Power Density engineering design philosophy, this amplifier provides 1400 watts at 2 from each of the four channels. All four chan- nels have independent LED indicators, attenuation, and input /output connections. Power switching and NexSys int
47、erfaces are config- ured in pairs of two. Because a channel may have to drive more than one speaker line, each channel has two pairs of output binding posts. The red binding posts are hot (+), while the black binding posts are at signal ground (-). RadioFans.CN Page 4Crest Audio Pro Series Power Amp
48、lifiers PUSHPUSH 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 RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION AVIS : RISQUE DE CHO
49、C LECTRIQUENE PAS OUVRIR USA ONLY MODEL # 460118 AMPS MAXIMUM INPUT CURRENT 120V, 60Hz OUTPUT POWER IN WATTS PER CHANNEL, 4 425W OUTPUT - CLASS 2 WIRING MAY BE USED Designed the exception being Model 10004, which has four. Connecting Outputs On the models 9001 and 10001, speaker cables must be connected to the single screw solderless lug connec- tors on the back of the amplifiers. For all other models, speaker cables can be connected with banana plugs, spade lugs, or bare wire to the 5-way binding posts. On the Models 8001 and 10004, two pairs of 5-way bind- ing posts are provided f
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