Table of Contents
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PROFESSIONAL POWER AMPLIFIERS
FXA
CLIP
SIGNAL
PROTECT
OFF
ACTIVE
CLIP
SIGNAL
PROTECT
OFF
ACTIVE
CLIP
SIGNAL
PROTECT
OFF
ACTIVE
CLIP
SIGNAL
PROTECT
OFF
ACTIVE
CLIP
SIGNAL
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OFF
ACTIVE
CLIP
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OWNER' S MANUAL
CLIP
-6
-6
FXA
-10
-3
-10
-3
SIGNAL
-15
-15
-1
-1
-30
-30
PROTECT
-80
0 dB
-80
0 dB
Ch A
Ch B
ACTIVE
CLIP
-6
-6
FXA
-10
-3
-10
-3
SIGNAL
-15
-15
-1
-1
-30
-30
PROTECT
-80
0 dB
-80
0 dB
Ch A
Ch B
ACTIVE
-6
-6
CLIP
FXA
-3
-3
-10
-10
SIGNAL
-15
-15
-1
-1
PROTECT
-30
-30
-80
0 dB
-80
0 dB
ACTIVE
Ch A
Ch B
CLIP
-6
-6
FXA
-10
-3
-10
-3
SIGNAL
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-15
-1
-1
PROTECT
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-30
-80
0 dB
-80
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ACTIVE
Ch A
Ch B
CLIP
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FXA
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-10
-3
SIGNAL
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-15
-1
-1
PROTECT
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-30
-80
0 dB
-80
0 dB
ACTIVE
Ch A
Ch B
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-6
CLIP
FXA
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-10
-3
SIGNAL
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PROTECT
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Table of Contents
Related Manuals for Crest Audio FXA SERIES
Summary of Contents for Crest Audio FXA SERIES
- Page 1 PROFESSIONAL POWER AMPLIFIERS CLIP CLIP SIGNAL SIGNAL PROTECT PROTECT 0 dB 0 dB Ch A Ch B ACTIVE ACTIVE CLIP CLIP SIGNAL SIGNAL PROTECT PROTECT 0 dB 0 dB Ch A Ch B ACTIVE ACTIVE CLIP CLIP SIGNAL SIGNAL PROTECT PROTECT 0 dB 0 dB...
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Page 2: Important Precautions
Damage caused by connec- Crest Audio is not responsible for dam- tion to improper AC voltage is not cov- age to loudspeakers for any reason. -
Page 3: Table Of Contents
FXA Block Diagram Appendix C Wire Gauge Charts Appendix D Rear Panel Symbols - Legend Appendix E FXA4801 Power Amplifier - Special Functions Appendix F Warranty Information Crest Audio FXA Series Power Amplifiers Page 3 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801... - Page 4 17.9"/437mm (19"/483mm to rack ears) 18"/457mm 35mm FXA3601 CA12 5.25" • • 133mm CA18 FXA4801* • • *See Appendix E for detailed FXA4801 rear panel drawings. Page 4 Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801...
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Page 5: Introduction
For your safety, please read the Important Precautions 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 sonic performance across the full audio bandwidth, even under stressful conditions. -
Page 6: Front Panel
3. AC Power Switch/Circuit Breaker. FXA Series amplifiers have a front-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. -
Page 7: Rear Panel
• • 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 spade 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. -
Page 8: Internal Configuration And Control
2 - Positive (+) Input Sensitivity The FXA Series amplifiers have a standard input sensitivity of .775 Volts for rated power at 8 Ohms. Models FXA601, FXA901, FXA1201, FXA2401 and FXA3601 are fitted with an internal jumper which allows optional gains of X20 or X40. Model FXA4801 features an external voltage gain/input sensitivity switch (See Appendix E). -
Page 9: Operation
Also, as an extra precaution, have the attenuators turned down during power-up. Cooling System and Requirements. FXA Series amplifiers use a twin-tunnel forced-air cooling system to maintain a low, even operating tem- perature. Drawn in by dual 45 cubic feet-per-minute (CFM) fans on the rear panel, air flows through the cooling fins of the channel heat sinks (dissipating power transistor heat), then exhausts through the front panel slots. -
Page 10: Connecting Inputs
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. Please note that some other Crest Audio amplifiers are configured with “Pin 3 hot”). - Page 11 • • scopes or other test • • equipment while the amplifi- er is in bridged mode may damage both the amplifier and test equipment! Crest Audio FXA Series Power Amplifiers Page 11 Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801...
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Page 12: Protection Features
® Protection Every model in the FXA Series incorporates TourClass protection features. Derived from Crest Audio’s extensive experience with the world’s largest sound rental companies, the TourClass group of circuits sets the industry standard for assured protection of internal amplifier circuits and all connected loads. -
Page 13: User Precautions
The amplifier’s clipping point is its maximum peak output power. At maximum peak output power, Crest Audio FXA Series amplifiers will deliver more power than many speakers can safely handle. Be sure the peak power capability of the amplifier is not excessive for your speaker system. To ensure that the speakers never receive excessive power, and to prevent amplifier clipping, use a properly adjusted external limiter (or a compressor with a ratio of 10:1 or higher) to control power output. -
Page 14: Maintenance
Crest Audio. User Responsibility Your FXA Series amplifier is very powerful and can be potentially dangerous to loudspeakers and operators alike. It is your responsibility to read the section titled “Important Precautions” and make sure that the amplifier is installed, wired, and operated properly as instructed in this manual. - Page 15 Appendices...
- Page 16 3 years † For full power at 4 Ohms. ‡ See table below for optional settings. Crest Audio reserves the right to make changes or improvements in manufacturing or design which may affect specification. ©1997 Crest Audio Inc. 10/28/97 FXA601...
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Page 17: Fxa Block Diagram
AMP FRONT END NON-INVERTED 2 / 3 INVERTED PIN 2 / 3 + JUMPER (Rear panel switch (REAR PANEL SWITCH ON CA18) on FXA 4801) Crest Audio FXA Series Power Amplifiers Appendix B Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801... -
Page 18: Wire Gauge Charts
1.45 0.87 1.74 0.55 1.09 0.37 0.73 1.45 8.24% 15.5% 0.75 10.8 19.9 10.8 1.74 1.09 1.74 0.73 1.09 0.75 15.5% 15.5 18.2 12.0 1.31 Appendix C Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801... -
Page 19: Rear Panel Symbols - Legend
5-Way Binding Post Output Connection - Channel A Stereo/Parallel 5-Way Binding Post Output Connection - Bridged Mono 5-Way Binding Post Output Connection - Channel B Stereo/Parallel Crest Audio FXA Series Power Amplifiers Appendix D Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801... - Page 20 Designed & manufactured in the USA by: GAIN Crest Audio Inc. Ø 40x 20x 100 Eisenhower Dr. Paramus, New Jersey 07652 USA XLR Pin + Gain Switch XLR Pin (+) Switch Appendix E Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801...
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Page 21: Warranty Information
Crest Audio Inc. warrants to the original purchaser of any FXA Series Crest Audio Amplifier purchased at an Authorized Crest Audio dealer, that it will be free from defects in material and workmanship for a period of three (3) years from the date of purchase. - Page 22 Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801...
- Page 23 Crest Audio FXA Series Power Amplifiers Models FXA601, FXA901, FXA1201, FXA2401, FXA3601, FXA4801...
- Page 24 Crest Audio Inc. 100 Eisenhower Dr., Paramus NJ 07652 USA : 201.909.8700 : 201.909.8744 http://www.crestaudio.com Printed in USA v. 1.2 10/28/97 © 1997 Crest Audio, Inc. Choice of touring professionals. C4400019...