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Introduction

Congratulations on your purchase of a new CA 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 world’s leading suppliers 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 CA Series is based on the same advanced circuit topologies that have made Crest ampli-
fiers the choice of touring professionals worldwide. CA 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 CA Series amplifiers are built in Crest’s state-of-
the-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 CA Series amplifiers incorporate Crest’s 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, stable performance even when your
CA 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 immediately. 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 carrier’s 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.

Installation and Mounting

Four CA Series amplifiers are 2-rack-space units: models CA2, CA4, CA6, and CA9. Models CA12 and
CA18 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 support, and use of rear supports is highly
recommended in all mobile and touring sound systems. Optional rack-mount handles are available.

Crest Audio CA Series Power Amplifiers

Page 5

Models CA2, CA4, CA6, CA9, CA12, CA18

Содержание CA

Страница 1: ...MANUAL PROFESSIONAL POWER AMPLIFIERS Professional Power Amplifier Professional Power Amplifier Professional Power Amplifier Professional Power Amplifier Professional Power Amplifier Professional Power Amplifier ...

Страница 2: ... used in an extremely dusty or smoky environ ment the unit should be periodically blown free of foreign matter 14 Do not remove the cover Removing the cover will expose you to potentially dangerous voltages There are no user serviceable parts inside 15 Connecting amplifier outputs to oscilloscopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test...

Страница 3: ...cting Outputs Mode Selection Stereo Parallel Bridged Mono Connections TourClass Protection 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 12 14 15 15 15 16 16 16 Power Amplifier Owner s Manual Table of Contents Appendix A Specifications Appendix B CA Block Diagram Appendix C Wire Gauge Charts Ap...

Страница 4: ...wer Amplifier Front height 3 5 89mm CA2 9 Front View Rear Side Views Front width 19 483mm Note see Appendix E for detailed CA18 rear panel drawings A A B AB A 1 3 2 B A B A A A B B A B 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 5 way binding post version shown Speakon version shown CA2 9 CA12 CA18 ...

Страница 5: ... 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 stable performance even when your CA Series amplifier is subjected to punishing extremes in the most demanding fixed or mobile sound rein forcement applications U...

Страница 6: ...o indicate that a signal above a minimum threshold is present at the amplifier input and that the signal is being amplified 6 Clip LED Illuminates at the clipping threshold Continuous illumination also indicates that ACL Active Clip Limiting protection circuitry is engaged 7 Active LED Indicates that AC power is connected and the amplifier is turned on 8 Protect LED Indicates that the channel is i...

Страница 7: ...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 possible and a ground loop results If this happens the first step is to move the ground lift switch to the top lift position ...

Страница 8: ...igured as Pin 2 hot On models CA2 CA4 CA6 CA9 and CA12 an internal jumper makes it possible to alter the amplifier to Pin 3 hot NOTE This jumper is NOT user configurable Please consult your supplier or local Crest Audio service center if you wish to have the input XLR polarity changed On the CA18 an external XLR polarity switch is featured See Appendix E Input Sensitivity The CA Series amplifiers ...

Страница 9: ...nel air flows through the cooling fins of the channel heat sinks dissipating power transistor heat then exhausts through the front panel slots The intelligent variable speed DC fans are controlled by heat sink temperature sensing circuits When the amplifier is turned on the fans briefly rev up then slow to an idle this indicates that the temperature sensing circuits are operating normally The fan ...

Страница 10: ...dio input to another amplifier input For more information see the sections on Balanced 1 4 TRS XLR Input Connectors Input XLR Polarity and Input Sensitivity Connecting Outputs Speakers are connected using 5 way Output Binding Posts or Speakon connectors depending on version supplied Please note that on the 5 way Output Binding Post version of the CA18 two pairs of 5 way bind ing posts are provided...

Страница 11: ... channel alone Signal is applied to the Channel A input only Both attenuators are used to control sig nal level 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 be used to loop thru the channel A signal when in parallel or bridged mono mode Use extreme caution when operating the amplifier in Bri...

Страница 12: ... 2 A A B B A B B A A B A A or A A A A B AB A 1 3 2 A A B B A B B A 643 106 A B A A A or Bridged Mono Stereo Mode Connections 5 Way Output Binding Posts NOTE the Binding Post version of the CA18 features two pair of 5 Way Output Binding Posts Parallel Mode Connections 5 Way Output Binding Posts Bridged Mono Mode Connections 5 Way Output Binding Posts ...

Страница 13: ...IN 1 2 1 2 1 A A B AB A 1 3 2 B A NL4FC B A A B A A B B A A or A A Speaker to PIN 1 Speaker to PIN 1 2 1 2 1 A A B AB A 1 3 2 B A NL4FC B A A B A A B B A A or Speaker to PIN 1 Speaker to PIN 2 2 1 2 1 Bridged Mono Stereo Mode Connections Speakon Output Connectors Parallel Mode Connections Speakon Output Connectors Bridged Mono Mode Connections Speakon Output Connectors ...

Страница 14: ...urned on or is reactivated after a protect condition is cor rected This exclusive Crest Audio feature gradually increases gain to the attenuator setting avoiding unnec essary stress on the loudspeakers Thermal Protection Abnormally high heat sink temperatures will engage the Protect circuit for the overheating channel only An output relay disconnects the loudspeakers until nominal temperature rang...

Страница 15: ...ter or a compressor with a ratio of 10 1 or higher to control power output Use one compressor limiter for each frequency band in systems with active electronic crossovers The ACL clip limiting circuit will automatically limit the duration of squared off continuous waveforms applied to the speakers The amplifier will however allow normal musical transient bursts to pass Of course when the amplifier...

Страница 16: ...ier is installed wired and operated properly as instructed in this manual Many loudspeakers can be easily damaged or destroyed by overpowering especially with the high power available from a bridged amplifier Read the section on Speaker Protection and always be aware of the speaker s continuous and peak power capabilities Crest Audio is not responsible for damage to loudspeakers for any reason Ser...

Страница 17: ...Appendices ...

Страница 18: ...0A 18 0A 2630 BTU hr 3713 BTU hr 3 5 x 19 x 18 89 x 483 x 457mm 49 lbs 22 24 kg 44 lbs 19 97 kg 5 years 600W 900W 1000W 1800W 2000W 550W 800W 900W 1600W 1800W 82V 116V 20Hz 20kHz 3dB 135kHz 20Hz 20kHz 84dB 0dB 0 01 0 01 700 1 60 dB 0 775V X86 5 20kΩ 10kΩ 105dB 60dB H 80 000 µF 100V 240V 50 60Hz 2 0A 8 6A 16 0A 21 0A 3250 BTU hr 4341 BTU hr 3 5 x 19 x 18 89 x 483 x 457mm 52lbs 23 60 kg 47 lbs 21 33...

Страница 19: ... 2 3 PIN 2 3 JUMPER REAR PANEL SWITCH ON CA18 INVERTED NON INVERTED PREAMP PREAMP ATTENUATOR ATTENUATOR AMP FRONT END AMP FRONT END OUTPUT STAGE OUTPUT STAGE OUTPUT RELAY OUTPUT RELAY 2 3 PIN 2 3 JUMPER REAR PANEL SWITCH ON CA18 INVERTED NON INVERTED B B A A CHANNEL A CHANNEL B PREAMP INCORPORATES INPUT SENSITIVITY VOLTAGE GAIN JUMPER REAR PANEL SWITCH ON CA18 ...

Страница 20: ...er Loss 8 ohm load 2 9 1 74 1 16 0 58 0 35 0 22 4 3 2 9 1 45 0 87 0 55 0 37 8 24 5 6 2 9 1 74 1 09 0 73 15 5 8 2 5 1 3 2 2 2 1 31 Power Loss 4 ohm load 5 6 3 4 2 3 1 16 0 70 0 44 8 2 5 6 2 9 1 74 1 09 0 73 15 5 10 8 5 6 2 9 1 74 1 09 0 73 15 5 9 8 6 3 4 3 2 6 Power Loss 2 ohm load 10 8 6 7 4 5 2 3 1 39 0 87 15 5 10 8 5 6 3 4 2 2 1 45 28 19 9 10 8 6 7 4 3 2 9 45 28 18 2 12 0 8 2 5 1 Appendix C Wire...

Страница 21: ...Power Loss 8 ohm load 0 81 0 51 0 32 0 20 0 128 1 61 1 02 0 64 0 40 0 25 6 2 4 0 2 5 1 60 1 01 0 60 11 9 7 7 5 0 3 2 2 0 1 20 Power Loss 4 ohm load 1 61 1 02 0 64 0 40 0 25 3 2 2 0 1 28 0 80 0 51 11 9 7 7 5 0 3 2 2 0 1 20 22 14 6 9 6 6 2 4 0 2 4 Power Loss 2 ohm load 3 2 2 0 1 28 0 80 0 51 6 2 4 0 2 5 1 60 1 01 22 14 6 9 6 6 2 4 0 2 4 37 26 17 8 11 8 7 7 4 7 Appendix C Wire Gauge Chart Imperial ...

Страница 22: ...Position Mode Selection Switch Stereo Position Chassis Ground Lift Switch Ground Lifted Position Chassis Ground Lift Switch Grounded Position Gain Select Switch CA18 XLR pin hot select switch CA18 Speakon Output Connector Channel A Stereo Parallel Speakon Output Connector Channel B Stereo Parallel Speakon Output Connector Bridged Mono 5 Way Binding Post Output Connection Channel A Stereo Parallel ...

Страница 23: ...igures XLR input connection polarity Either pin 2 or pin 3 may be selected as the hot pin Amplifiers are shipped pin 2 hot from the factory Gain Switch This switch permits the amplifier to be configured for the standard input sensitivity 775V for rated power 8Ω or for optional voltage gains of X40 or X20 Refer to the specifications for input sensitivity values at optional voltage gains of X40 and ...

Страница 24: ...rest Audio Inc 100 Eisenhower Dr Paramus NJ 07652 USA TEL 201 909 8700 FAX 201 909 8744 http www crestaudio com Printed in USA Choice of touring professionals B5000013 v 2 9 11 25 97 1997 Crest Audio Inc ...

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