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CD
CD Power Amplifier
Owner’s Manual
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Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the lit- erature accompanying the product. CAUTION: Risk of electrical shock — DO NOT OPEN! CAUTION:To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. R
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IMPORTANT SAFETY INSTRUCTIONS WARNING: When using electrical products, basic cautions should always be followed, including the following: 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block any of the ventilation openings. Install in accordance with manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, heat registers, sto
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important precautions Service Information Save the carton and packing materials! Do not run the output of any ampli- 1 ¡ Should you ever need to ship the unit, fier channel back into another Do not remove the cover! use only the original factory packing. channel’s input. Removing the cover will expose you to potentially dangerous voltages.There are For replacement packaging,call Crest Audio’s Do not parallel- or series-connect no user serviceable parts inside. Customer Service Department direct
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table of contents p.2 how to use this manual 1 p.3 introduction p.5 installation 2 unpacking mounting cooling and ventilation powering maintenance p.9 features overview 3 front panel rear panel p.15 operation modes 4 stereo contents parallel bridged p.17 connections 5 input output p.21 safety 6 tourclass protection precautions user responsibility p.25 service and support 7 support contact us registration p.27 specifications a appendices p.28 block diagram b p.29 optional hand
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CD owner’s manual how to use this manual 1 conventions terms official Crest Audio features and each indicator or control on the amplifier will appear as: terms actions specific actions or selections the user can execute will appear as: actions tasks are broken down into steps 1 2 3 warnings Procedures not to attempt. Issues or hazards to keep in mind when operating the equipment. indicators What to look for on ® the equipment display. Alerts, indicators, or prompts that may appear. tips Pref
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introduction 1 welcome Congratulations on your purchase of a new CD Series professional power amplifier and thank you for your confi- dence 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 systems. For your safety, please read the Important Precautions section before installing and operating the amplifier.The Crest Audio CD Series amplifiers are designed f
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installation 2 / what to do with the shipping carton unpacking / proper rack-mounting technique / mounting keeping the amplifier cooled / required AC line voltages cooling and / routine maintenance practices ventilation powering maintenance p.5
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installation CD owner’s manual 2 unpacking Please inspect the amplifier carefully immediately after unpacking. If you find any dam- For replacement age, notify your supplier/dealer immediately. Only the shipper may file a damage claim packaging, call Crest with the carrier for damage incurred during shipping. Be sure to save the carton and Audio’s all packing materials for the carrier’s inspection. Customer Service Department directly. If the packing materials are in good condition, please sav
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installation 2 cooling and ventilation CD amplifiers use a forced air cooling system to maintain a low, even operating tem- perature. Make certain that there is enough space around the front and rear of the amplifier to allow the Air is drawn in by a DC fan on the rear panel, flows through the cooling fins and then heated air to escape. When mounting in a rack, exhausts through the front panel vent. try to avoid using doors or covers on the front Heat sink temperature is monitored and controls t
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features overview 3 / location of connectors and controls front panel / legend of panel symbols rear panel p.9
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features overview 3 CD owner’s manual CD shown 1 2 3 4 5 6 7 8 9 p.10
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features overview 3 front panel Rack Mounting Ears 1 Two front-panel mounting holes are provided on each mounting ear. Channel Level attenuators 2 Two input attenuators adjust level for their respective amplifier channels in stereo and in parallel modes.In Bridged Mono mode, the channel A attenuator controls overall signal level for both channels (see rear panel mode switch description). Protect 3 This Red LED indicates that the amp channel is in Protect mode. During Power up, the amp briefly g
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features overview CD owner’s manual 3 2 3 4 1 6 7 5 8 rear panel legend rear panel input connection IEC power connector 1 XLR connector polarity Accepts a standard IEC terminated power cable TRS connector polarity Breaker 2 bridged mono mode Resettable circuit breaker - no fuses are used. Breaker can trip due to parallel mode a power surge or over-voltage condition. If it trips once, reset it. If it continues to trip, the amplifier may need servicing. stereo mode Fan 3 chassi
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features overview 3 Never connect a speaker of LESS than 2Ω minimum impedance to an rear panel individual channels’ output connections Output connections when operating in STEREO or PARAL- 4 LEL mode. Speakers can be connected via the high current binding posts and the industry-standard Speakon (NL-4) connectors. Never connect a speaker of LESS than 4Ω minimum impedance to Binding posts: One pair (Red- hot,Black- ground) per channel. Channel A and B “+” output connec- tions when operating in BR
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operation modes 4 / choosing the appropriate mode stereo / switching between operation modes / special considerations when using bridged mode parallel bridged p.15
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operation modes 4 CD owner’s manual mode selection The three-position,recessed Mode Select switch (located on the rear panel) configures the amplifier for Stereo, Parallel or Bridged mode. Amplifiers are factory-configured for Stereo mode. Shut the amp off before changing modes. stereo In Stereo mode,both channels operate independently,with their input atten- uators controlling their respective levels.Signal at Channel A’s input produces output at Channel A’s output,while signal at Channel B’
