Crest_Audio_FXA_Series_Owners_Manual电路图.pdf

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1、OWNERS MANUAL PROFESSIONAL POWER AMPLIFIERS FXA OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE FXA -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 -1 -3 -6 -10 -15 -30 Ch B 0 dB

2、-80 FXA OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 FXA OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 FXA OFF CLIP SIGNAL PROTECT ACTIVE C

3、LIP SIGNAL PROTECT ACTIVE FXA -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE FXA -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 OFF RadioFans.CN 收音机爱 好者资料库 1. Save the carton and packing material even if

4、the equipment has arrived in good condition. Should 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 opera

5、tion. 4. Do not spill water or other liquids into or 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

6、 should be routed so that they are not likely to be 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

7、the electri- cal system ground. Precautions should be 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 wa

8、rranty. 9. Have gain controls on amplifiers turned down 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 no

9、t appear to operate normally, or exhibits a marked change 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, or Crest Audio at 201.909.8700 (USA). Important Precautions This symbol

10、is used to alert the oper- ator to follow important operating 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

11、者资料库 Crest Audio FXA Series Power AmplifiersPage 3 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 Introduction Unpacking Installation and Mounting Front Panel Rear Panel Internal Configuration and Control Operation Connecting Power / Circuit Size Requirements Cooling Requirements Connecti

12、ng Inputs Connecting Outputs Mode Selection Stereo /Parallel/Bridged Mono Connections 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 10 11 12 13 13 13 14 14 14 Power Amplifier Own

13、ers Manual Table of Contents FXA Appendix ASpecifications Appendix BFXA Block Diagram Appendix CWire Gauge Charts Appendix DRear Panel Symbols - Legend Appendix EFXA4801 Power Amplifier - Special Functions Appendix FWarranty Information RadioFans.CN 收音机爱 好者资料库 Page 4Crest Audio FXA Series Power Ampl

14、ifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 FXA OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 FXA Front height 5.25 133mm Front width 19 / 483mm FXA3601, FXA4801 Front View OFF CLIP SIGNAL PROTECT AC

15、TIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 FXA Front height 3.5 89mm FXA601-FXA2401 Front View Front width 19 / 483mm *See Appendix E for detailed FXA4801 rear panel drawings. A A B AB A 1 3- 2+ + 5.25 133mm CA12 CA18 3.5 89mm CA2 CA4 CA6 CA9

16、17.9/437mm (19/483mm to rack ears) 1.375 35mm 18/457mm Rear/Side Views and Dimension Information 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 FXA3601 FXA4801* FXA2401 FXA1201 FXA901 FXA601 FXA301 Introduction Congratulations on your purchase of a new FXA Series profession

17、al 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 of professional and commercial/industrial audio systems. For your safety, please read the Important Pre

18、cautions section before installing and operating the amplifier. The Crest Audio FXA Series is based on the same advanced circuit topologies that have made Crest ampli- fiers the choice of touring professionals worldwide. FXA Series amplifiers are designed for high operating efficiency and accurate s

19、onic performance across the full audio bandwidth, even under stressful conditions. In order to maintain strict quality assurance standards, all FXA Series amplifiers are built in Crests state-of- the-art USA manufacturing facility. Internal components are the finest available, and key sub-assemblies

20、 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 FXA Series amplifiers incorporate Crests exclu- sive TourClassprotection features to safeguard both internal circuitry and co

21、nnected 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, stable performance even when your FXA Series amplifier is subjected to punishing extremes in the most

22、 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 immediately. Only the shipper may file a damage claim with the carrier for damage incurred during shippin

23、g. 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 Audio or an authorized service center, you should use only the original factory packing. Installatio

24、n and Mounting Four FXA Series amplifiers are 2-rack-space units: models FXA601, FXA901, FXA1201, and FXA2401. Models FXA3601 and FXA4801 are 3-rack-spaces high. All mount in standard 19-inch racks. Four front- panel mounting holes are provided on each amplifier. Rear mounting ears give additional s

25、upport, and use of rear supports is highly recommended in all mobile and touring sound systems. Crest Audio FXA Series Power AmplifiersPage 5 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 FXA Front Panel 1. Rack Mounting Ears. Two front panel mounting holes are provided on each mounting

26、ear. 2. Fan Outlet Grills. FXA Series amplifiers are cooled by two, rear-mounted fans. Cool air flows over the heat sinks and exhausts through the front grills. Make sure these outlets remain clear to allow unrestricted air flow. 3. AC Power Switch/Circuit Breaker. FXA Series amplifiers have a front

27、-panel combination AC switch and circuit breaker. (No fuses are used.) If the switch shuts off during normal use, push it back to the “ON” position once. If it will not stay on, the amplifier needs servicing. 4. Clip LED. Illuminates at the clipping threshold. Continuous illumination also indicates

28、that ACL (Active Clip Limiting) protection circuitry is engaged. 5. Signal LED. Illuminates to indicate that a signal (above a minimum threshold) is present at the amplifier input, and that the signal is being amplified. 6. Protect LED. Indicates that the channel is in Protect mode (speakers disconn

29、ected by output relay). 7. Active LED. Indicates that AC power is connected and the amplifier is turned on. 8. 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 t

30、o the same setting. Page 6Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 OFF CLIP SIGNAL PROTECT ACTIVE CLIP SIGNAL PROTECT ACTIVE -1 -3 -6 -10 -15 -30 Ch B 0 dB-80 -1 -3 -6 -10 -15 -30 Ch A 0 dB-80 FXA 6781243 FXA 5 Never try to hold the circuit br

31、eaker/power switch in the “ON” position if it wont stay there itself! Rear Panel See Appendix E for information specific to model FXA4801. 9. Output Connectors FXA Series amplifiers are supplied with 5-way Binding Posts. Connection to the binding posts can be made with bare wire, banana plugs, or sp

32、ade lug terminations. Make connections to both the Channel A and Channel B terminals for Stereo or Parallel Mode, or a single 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 th

33、e of the FXA4801, two pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is possible. 10. Mode Selection Switch. This recessed, three-position switch configures the amplifier for Stereo, Parallel or Bridged Mono Mode operation. Amplifiers are factory-configur

34、ed for Stereo Mode. See Appendix D and the section on Mode Selection for more information. 11. Signal Ground Lift Switch. The recessed signal ground lift switch (factory-set to the ground bottom position) electrically connects signal ground to the chassis/AC ground. The top position lifts the amplif

35、iers signal ground. In a properly designed system (for safety purposes and to minimize noise), amplifiers should be 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 possi

36、ble, and a ground loop results. If this happens, the first step is to move the ground lift switch to the top (lift) 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 signa

37、l source equipment are on the same AC ground. Should the ground loop problem persist after the ground lift switch has been set to the lift position, then the shield on balanced input lines should be grounded at one end only (usually the signal source). 12-13. Balanced 1/4 (TRS) the unused connectors

38、 may be used for “loop through” connection 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 using three-pole (stereo) TRS connectors, make sure t

39、hat 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. Crest Audio FXA Series Power AmplifiersPage 7 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 FXA RISK OF ELECTRIC SHOCK DO NOT OPEN AVIS

40、 : 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 CAUTION A A B AB A Designed this indica

41、tes that the temperature sensing circuits are operating normally. 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 m

42、aximum allowed temperature, the sensing circuit will open the output relay, disconnecting the load from that channel. If the power trans- former overheats, another sensing circuit opens both channel output relays until the transformer cools to a safe temperature. IMPORTANT: To ensure optimum cooling

43、, periodically clean the amplifier fan filters (removable without 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 flo

44、w out without resistance. If the amplifiers are to be housed in 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 FXA Series Power AmplifiersPage 9 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 F

45、XA Connecting Inputs. Use either the XLR or 1/4-inch input connectors on the rear to supply audio signals to your Crest Audio FXA Series amplifier. Both connectors accept balanced and unbalanced audio connections. (The FXA Series amplifiers are configured standard with “Pin 2 hot” on XLR inputs. Ple

46、ase note that some other Crest Audio amplifiers are configured with “Pin 3 hot”). The unused 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

47、 (TRS) or XLR input may be used. NOTE: The channel B input connectors (XLR and/or TRS) may be used to “loop thru” the channel A signal 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

48、amplifier is in Bridged Mono Mode; both sides are “hot.” If an output patch panel is used, 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 separate

49、ly at 2 ohms. Driving bridged loads of less than the recommended minimums will activate the IGM circuitry, resulting in a loss of power, and may also lead to a thermal protect condition. See figures on page 11 showing output connection information. Page 10Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 FXA Crest Audio FXA Series Power AmplifiersPage 11 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801 FXA Connecting amplifier outputs to oscillo- scopes or other test equipment while the amplifi- er is in bridged m