CD Series Owner`s Manual
Contents
1. A detailed in documentat shock This equipment conforms to EN 55022 Class A domestic environment this product may cause This symbol is used to alert the operator to follow important procedures and precautions ion This symbol is used to warn operators that uninsulated dangerous voltages are present within the equipment enclo sure that may pose a risk of electric Ina radio interference in which case the user may be required to take adequate measures This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are desi provide reasonable protection against harmful ence in a residential installation This equipment igned to interfer gener ates uses and can radiate radio frequency energy and if not installed and used in accordance with the i tions may cause harmful interference to radio cations However there is no guarantee that in nstruc communi erference will not occur in a particular installation If this equipment does cause harmful interference to radio or te levision reception which can be determined by turning the equipment off and on the user is encouraged o try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect2. gt when to get support support gt ways to contact Crest Audio contact us CREST AUDIO service and support en support In the unlikely event that your amplifier develops a problem it must be returned to an authorized distributor service center or shipped directly to our factory To obtain service contact your nearest Crest Audio Service Center Distributor Dealer or any of the worldwide Crest Audio offices For those with Internet access please visit the C rest Audio web site contact us customer service phone 201 909 8700 USA fax 201 909 8744 USA email customerserve crestaudio com technical support phone 201 909 8700 USA fax 201 587 0550 USA email techserve crestaudio com web site www crestaudio com For replacement mail packaging call Crest Crest Audio Inc Audio s Customer Service 16 00 Pollitt Drive Fair Lawn NJ 07410 USA p 26 specifications CD Series 1kHZ 0 2 THD N Stereo power 80 4Q 20 Bridged mono power 80 40 Maximum output voltage rms each channel 11kHZ 0 4 THD N Frequency response 1W 80 Power bandwidth rated power Damping Factor Input cmrr Input sensitivity for full rated output power Input impedance Hum and noise A weighted below rated power Crosstalk Class Circuit breaker rating 120Vac Circuit breaker rating 230vac Current draw 1 8 power 42 120Vac Current draw 1 3 power 40 120Vac Current draw idle 120Vac Thermal emissions 1 3 Power 4
3. all models ACL IGM protection 5 segment bargraph VU meter Active all models ACL IGM AUTORAMP short circuit DC Voltage Turn ON OFF transient current in rush sub ultrasonic input all models 16 guage steel chassis Inches 3 5 height x 19 width x 15 3 depth MM 89 height x 483 width x 389 depth all models 30 lbs 13 6 kG 35 Lbs 15 9 kG 38 Lbs 17 2 kG 41 4 Lbs 18 8 kG p 27 b lock d ia ram CD owner s manual Channel A Inputs Channel A Outputs OUTPUT STAGE A 5 Way Neutrik T ACL IGM Binding Posts Speakon 114 ATTENUATOR DE PROTECT g p TRS AUTORAMP 7 Y Female e 3 Pin XLR OUTPUT 10 775V RELAY Lod of x20 VU METER GAIN O van Se SWITCH en Channel B APA Tm Inputs gro xa0 Channel B Outputs MODE OUTPUT STAGE SWITCH SW Neutrik Lo ACL IGM Binding Posts Speakon 1147 ASG DC PROTECT TRS AUTORAMP E O A PARALLEL THERMAL B STEREO C BRIDGED Female E 5 3 Pin XLR 4 OUTPUT ATTENUATOR LJ VU METER RELAY SEE SECTION 5 FOR OUTPUT CONNECTION DETAILS p 28 optional handle installation HAMDLE J CREST Fa 232000010 OREW CREST PH CG tc000p d r n SCREW REST F M CHOCO The CD amplifiers can be outfitt
4. available from the amplifier Appendix C gives cable length figures in feet AW G wire gauges and in metric values see wire gauge p 22 safety TourClass protection Just like Crest Audio s highly acclaimed Pro series amps CD series amps incorporate Tour lass protection features Derived from Crest Audio s extensive experience with the worlds largest sound rental companies the TourClass group of circuits sets the industry standard for assured protection of internal amplifier circuits and all connected loads ACL ACTIVE CLIP LIMITING At the amplifier full power limit or clipping point ACL will be activated This is indicated by illumination of the ACL IGM LED The channel gain is automatically reduced protecting the loudspeakers from potential damage from the high power continuous square waves that would otherwise be produced ACL may be activated by uncontrolled feedback oscillations improper equipment gain settings or an equipment malfunction upstream from the amplifi er O nly steady or excessive clipping not normal program transients will trigger ACL The circuit is virtually transparent in operation and full signal bandwidth is maintained IGM INSTANTANEOUS GAIN MODULATION IGM is an innovative circuit that allows the amplifier to operate safely into loads as low as 4 ohms W hen the amplifier sees a load that overstresses the output stage the IGM circuit adjusts the channel gain to a safe level This gain control circui
5. switch This three position switch allows the user to select the input sensitivity to 775v 0 dBu X 20 or X40 for full rated output power The default factory setting is X 20 N ever connect a speaker of LESS A than 20 minimum impedance to an individual channels output connections when operating in STEREO or PARAL LEL mode N ever connect a speaker of LESS than 40 minimum impedance to Channel A and B output connec tions when operating in BRIDGE mode In BRIDGE mode operation the amplifier can produce output voltages exceeding 120VRMS Use extreme cau tion N ever connect a hot red output to ground A or to another hot red output In situations where an UNBAL A ANCED signal is fed to the amp it s important to ground the unused input If the inverting input of an amp channel is left floating the chan nels gain will drop by 6 dB In effect the amp will not be as loud For more information about this ask your dealer or contact Crest Audio Technical Support directly Do not adjust the mode selection switch while the amplifier is turned on CREST AUDIO p 13 operation modes gt choosing the appropriate mode stereo gt switching between operation modes special considerations when using bridged mode parallel bridged SALDO operation modes Gb wna mania mode selection The three position recessed Mode Select switch located on the rear panel configures
6. 0 BTU HR Cooling Input connectors per channel Output connectors Controls LED indicators TourClass protection Construction Dimensions Weight net CREST AUDIO 1000 280w 500W 500W 1000W 1000W 53 Vrms 20Hz 20kHz 1 1dB 20Hz 20kHz 1 1dB 400 1 e 80 60dB O 1 kHz 0 775V X20 X40 20K balanced 10K unbalanced gt 100dB gt 60dB 1kHz below rated power D 10A 6A 2 6A 5 3A 1 0A 484 1500 400W 750W 750W 1500W 1500W 64 Vrms 20Hz 20kHz 1 1dB 20Hz 20kHz 1 1dB 400 1 89 60dB 1 kHz 0 775V X20 X40 20K balanced 10K unbalanced gt 100dB D 12A 8A 3 6A 7 SA 1 1A 614 Back to front via variable speed fan all models Female XLR pin 2 1 4 TRS Combo connectors all models Speakon connectors and 5 way binding post all models gt 60dB 1kHz below rated power 2000 560W 1000W 1000W 2000W 2000W 72 Vrms 20Hz 20kHz 1 1dB 20Hz 20kHz 1 1dB 400 1 89 60dB O 1 kHz 0 775V X20 X40 20K balanced 10K unbalanced gt 100dB D 15A 10A 4 5A 9 6A 1 25A 781 3000 800W 1500W 1500W 3000W 3000W 85 Vrms 20Hz 20kHz 1 1dB 20Hz 20kHz 1 1dB 400 1 so 60dB O 1 kHz 0 775V X20 X40 20K balanced 10K unbalanced gt 100dB gt 60dB 1kHz below rated power D 20A 12A 7 0A 14 0A 1 5A 1024 Front panel two attenuators power switch Rear panel signal ground lift mode select circuit breaker
7. CREST AUDIO CD Power Amplifier Owner Manual NL Intended to alert the user to the presence of uninsulated dangerous voltage within the products 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 Refer servicing to qualified service personnel WARNING To prevent electrical shock or fire hazard do not expose this appliance to rain or moisture Before using this appliance read the operating guide for further warnings Este s mbolo tiene el prop sito de alertar al usuario de la presencia de voltaje peligroso sin aislamiento dentro de la caja del producto y que puede tener una magnitud suficiente como para constituir riesgo de descarga el ctrica Este s mbolo tiene el prop sito de alertar al usario de la presencia de instruccones importantes sobre la operaci n y mantenimiento en la informaci n que viene con el producto PRECAUCION Riesgo de descarga el ctrica NO ABRIR PRECAUCION Para disminu r el riesgo de descarga el ctrica no abra la cubierta No hay piezas tiles dentro Deje todo mantenimiento en m
8. anos del personal t cnico cualificado ADVERTENCIA Para evitar descargas el ctricas o peligro de incendio no deje expuesto a la lluvia o humedad este apara to Antes de usar este aparato lea m s advertencias en la gu a de operaci n Ce symbole est utilis dans ce manuel pour indiquer a I utilisateur la pr sence d une tension dangereuse pouvant tre d amplitude suffisante pour constituer un risque de choc lectrique concernant l utilisation et l entretien de l appareil dans le paragraphe signal Ce symbole est utilis dans ce manuel pour indiquer a l utilisateur qu il ou qu elle trouvera d importantes instructions ATTENTION Risques de choc lectrique NE PAS OUVRIR ATTENTION Afin de r duire le risque de choc lectrique ne pas enlever le couvercle Il ne se trouve l int rieur aucune pi ce pouvant tre repar e par l utilisateur Confiez l entretien et la r paration de l appareil un r parateur agr AVERTISSEMENT A fin de pr venir les risques de d charge lectrique ou de feu n exposez pas cet appareil la pluie ou l humidit Avant d utiliser cet appareil lisez attentivement les avertissements suppl mentaires de ce manuel Dieses Symbol soll den Anwender vor unisolierten gef hrlichen Spannungen innerhalb des Geh uses warnen die von Ausreichender St rke sind um einen elektrischen Schlag verursachen zu k nnen Dieses Symbol soll den Benutzer auf wichtige In
9. cir cuit breaker in the on position if it won t stay there by itself 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 pinched by items placed upon or against them Always operate the unit with the AC ground wire connected to the electrical system ground Precautions should be taken so that the means of grounding of a piece of equipment is not defeated Damage caused by connection to improper AC voltage is not covered by any warranty Mains voltage must be correct and the same as that printed on the rear of the unit Do not ground any hot red terminal Never connect a hot red output to ground or to another hot red output Power down and disconnect units from mains voltage before making connections Do not drive the inputs with a sig nal level greater than that required to enable equipment to reach full output fier channel back into another channel s input Do not parallel or series connect an amplifier output with any other amplifier output Crest Audio is not responsible for damage to loudspeakers for any reason Do not connect the inputs or out puts of amplifiers to any other voltage source such as a battery mains source or power supply regard less of whether the amplifier is turned on or off Connecting amplifier outputs to oscilloscopes or other test equip ment while the amplif
10. e during operation this indicates that either a problem has developed internal to the amplifier or the amplifier is being over stressed due to an over current short circuit or a load impedance below the operating range or thermal condition In this event the amplifier should be switched O FF and the load connections checked for shorts and proper load impedance If overheating is suspected allow the amplifier to cool and check that the airflow is not impeded ACL IGM This Red LED illuminates when either the ACL or IGM protection circuitry is engaged See Section 6 Tourclass Protection for more information on these Crest exclusive features 24 18 6 OdB The first three LEDs 24 18 6 are Green and the last led OdB is yellow These LEDs respond to the incoming program material as peak meters Under normal operating conditions the Green LEDs illuminate with the dynamics of the program material and theYellow LED flashes during the loudest peaks Signal Green LED varies in intensity in response to signals below 24 dB Active Green LED illuminates when the amp is on to show that the channel is active Fan Outlet Grill CD Series amplifiers are cooled by a single rear mounted fan Cool air flows over the heat sink and exhausts through the front grill lee Make sure this outlet remains clear to allow unrestricted airflow one side of the AC ie Hazardous energy z may be present in the Power switch enclos
11. e to save the carton and a bia all packing materials for the carriers inspection Customer Service SE Department directly If the packing materials are in good condition please save them see service and support If you ever need to ship the unit anywhere without mounting it in a rack you should take advantage of the original factory packing materials in order to avoid unnecessary damage mounting All CD Series amplifiers mount in standard 19 inch racks and occupy two rack spaces 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 Handles are available as an option P N C 32000010 CD dimensions lt front width 19 00 483mm gt front DICE A atte Men height 3 47 88 mm d lt rear width 17 12 435mm gt A g SCH front Rives A height stereo EI 3 47 Bridg 88mm En Den lt depth from rack rails 16 55 420mm gt mi rack mount dimensions 16 05 407mm gt p 6 installation cooling and ventilation CD amplifiers use a forced air cooling system to maintain a low even operating tem perature Air is drawn in by a DC fan on the rear panel flows through the cooling fins and then exhausts through the front panel vent Heat sink temperature is monitored and controls the variable sp
12. ed with optional handles This option requires 2 CD series handles P N C 32000010 and 4 48 32 1 2 undercut flat head screws P N C38000008 You may order these from your dealer or directly from Crest Audio CREST AUDIO p 29 W ire Q aug e CD owner s manual stranded cable length wire gauge power loss 80 load 4Q load 2 Q load 2 meters 0 3mm 2 9 5 6 10 8 0 5 1 74 34 6 7 0 75 1 16 2 3 4 5 15 0 58 1 16 2 3 25 0 35 0 70 1 39 4 0 0 22 0 44 0 87 5 meters Onse 43 8 2 15 5 0 75 29 5 6 10 8 15 1 45 2 9 5 6 25 0 87 1 74 34 4 0 55 1 09 2 2 6 0 37 0 73 145 1 meters 0 5mm 8 24 5 5 28 0 0 75 56 10 8 19 9 15 29 5 6 10 8 25 1 74 2 9 6 7 4 1 09 1 74 43 6 0 73 1 09 29 30 0 75mm 15 5 0 73 45 1 5 8 2 15 5 28 2 5 5 1 9 8 18 2 4 3 2 6 3 12 0 6 2 2 4 3 8 2 10 1 31 2 6 5 1 p 30 wire qauge stranded cable length CREST AUDIO 5 feet 1 0 4 0 feet Q 0 feet wire gauge 18AW G 16 14 12 10 18AW G 16 14 12 10 18AW G 16 14 12 10 18AW G 16 14 12 10 8 Q load 0 81 0 32 0 20 0 128 1 61 1 02 0 64 0 40 0 25 6 2 40 25 1 60 1 01 0 60 11 9 1 7 5 0 32 20 1 20 40 load 1 61 1 02 0 64 0 40 0 25 3 2 20 1 28 0 80 11 9 1 7 5 0 32 20 1 20 22 146 9 6 6 2 40 24 power loss 20 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 62 4 0 24 31 26 178 118 1 7 4 7
13. eed fan Fan speed increases only as required keeping fan noise to a minimum Keep this unit 8 from any combustible surface on all sides If the heat sink surpasses its maximum allowed temperature the thermal protection circuit will activate and open the output relays allowing the amplifier to cool to a safe temperature Normal operation will resume once the amplifier cools to a safe level Thermal protect activation only occurs under extreme thermal conditions and is not part of normal operation powerin Unless otherwise specified when ordered CD amplifiers are supplied factory set to following voltage options Option 1 us domestic nominal 120Vac 60Hz for rated power output safe operating range 100 132Vac Option 2 export models nominal 230Vac 50H z for rated power output safe operating range 200 253Vac maintenance On some CD amplifier models the fan is supplied with a removable foam filter T his fil ter should be cleaned periodically with compressed air If the amplifier is used in an extremely dusty or smoky environment the unit should be periodically blown free using compressed air of any foreign matter that may have built up inside the unit Users will not need to make any adjustments to the amplifier during its lifetime T here are no user serviceable parts or adjustments that require opening the amplifier CREST AUDIO Make certain that there is enough space around the front and rear of the ampli
14. fier to allow the heated air to escape W hen mounting in a rack try to avoid using doors or covers on the front and rear of the enclosure the exhaust air must not be impeded suggestion In racks with closed backs allow at least one stan dard rack space opening for every four amps p 7 gt location of connectors and controls gt legend of panel symbols CREST AUDIO features overview front panel rear panel p 9 features overview ma CD shown Cremmer CH Dre I CD 3000 oda E PROFESSIONAL o ei Power AMPLIFIER O acnve LY AL p 10 features overview front panel Rack Mounting Ears Two front panel mounting holes are provided on each mounting ear Channel Level attenuators 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 This Red LED indicates that the amp channel is in Protect mode During Power up the amp briefly goes into protect mode in order to prevent any loud spikes from being fed to the speakers After a few seconds the amp comes out of protect mode and is ready for normal operation If the amp stays in Protect mode this indicates that there may be a problem internal to the amp If the amp goes into Protect mod
15. ier isin bridged mono mode may damage both the amplifier and test equipment Do not spill water or other liquids into or on the unit or operate the unit while standing in liquid Do not block fan intake or exhaust ports Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit such as a bed rug weathersheet carpet or completely enclosed rack If the unit is used in an extremely dusty or smoky environment the unit should be periodically blown free of foreign matter Do not use the unit near stoves heat registers radiators or other heat producing devices The power cord of equipment should be unplugged from the out let when left unused for a long peri od of time Do not remove the cover Removing the cover will expose you to potentially dangerous voltages There are no user serviceable parts inside Equipment should be serviced by qualified service personnel when The power supply cord or the plug has been damaged B The equipment has been exposed to rain C The equipment does not appear to oper ate normally or exhibits a marked change in performance The equipment has been dropped or the enclosure damaged To obtain service contact your nearest Crest Audio Service Center Distributor Dealer or Crest Audio at 201 909 8700 USA or visit www crestaudio com for addi tional information email techserve crestaudio com
16. ly intense noise for a sufficient time The U S Governments O ccupational and Health Administration O SHA has specified the following permissible noise level exposures Duration Per Day In Hours Sound Level dBA Slow Response 8 90 6 92 4 95 3 97 2 100 1 1 2 102 1 105 1 2 110 1 4 or less 115 According to OSHA any exposure in excess of the above permissible limits could result in some hearing loss Ear plugs or protectors to the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure is in excess of the limits as set forth above To ensure against potentially dangerous exposure to high sound pressure levels it is recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation SAVE THESE INSTRUCTIONS important precautions Saethecartonand packingmaterials Donotrunthe output of any ampli Service Information Should you ever need to ship the unit use only the original factory packing For replacement packaging call C rest A udio s Customer Service Department directly Read all documentation before operating your equipment Retain all documentation for future reference Follow all instructions printed on unit chassis for proper operation Never hold a power switch or
17. nic integrity In order to maintain strict quality assurance standards all Crest Audio power amplifiers are built in our state of the art USA manufacturing facility Internal components are the finest available and key sub assemblies are pre tested before final assembly Each amplifier is burned in and thoroughly tested using precision audio test equipment before shipping In addition all CD Series amplifiers incorporate Crest s exclusive TourC lass protection features to safeguard both internal circuitry and connected loudspeakers This proven combination of advanced design quality construction and comprehensive circuit protection is your guar antee of fail safe reliability You can depend on consistent stable performance even when your CD Series amplifier is subjected to punishing extremes in the most demanding fixed or mobile sound reinforcement applications CREST AUDIO p 3 Y what to do with the shipping carton proper rack mounting technique keeping the amplifier cooled required AC line voltages routine maintenance practices CREST AUDIO installation unpacking mounting cooling and ventilation powering maintenance installation CD owner s manual unpacking Please inspect the amplifier carefully immediately after unpacking If you find any dam age notify your supplier dealer immediately O nly the shipper may file a damage claim Passa e Si with the carrier for damage incurred during shipping Be sur
18. p 31 CREST http wwwcrestaudio com CD Owner s Manual Version 1 1 10 14 04 SS AUDIO P N 80305114
19. ructed in this manual Many loudspeakers can be easily damaged or destroyed by overpowering especially with the high power available from a bridged amplifier Always be aware of the speak er s continuous and peak power capabilities C rest Audio is not responsible for damage to loudspeakers for any reason see speaker protection speaker protection All loudspeakers have electrical thermal and physical limits which must be observed to pre vent damage or failure Cone or compression drivers can be damaged sometimes to the point of failure from excessive power low frequencies applied to high frequency drivers severely clipped wave forms and DC voltage All CD Series amplifiers automatically protect speakers from DC voltages and subsonic signals see TourClass protection Mid and high frequency transducers compression drivers in particular are highly suscep tible to damage from overpowering clipped wave forms or frequencies below their rated pass band W hen using an electronic crossover make absolutely certain that the low and mid bands are connected to the correct amplifiers and drivers and not accidentally connected to those for a higher or lower frequency band The amplifier s clipping point is its maximum peak output power At maximum peak output power Crest Audio CD 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
20. s bridged mono mode five way binding post connectors CREST AUDIO connections Bridged Mono connections stereo mode speakon output connectors Speaker to PIN 1 Speaker to PIN 1 AY MA The Channel A Speakon has the signal from channel B present on PIN 2 and Pin 2 This is handy in situations where the output is dri ving bi amped monitors parallel mode speakon output connectors Speaker to PIN 1 Speaker to PIN 1 bridged mono mode speakon output connectors Speaker to PIN 1 s8 Speaker to PIN 2 AA p 20 Bridged Mono CD owner s manual SS safety gt the owner s role in amplifier safety user responsibility gt protecting your speakers description of TourClass protection features speaker protection TourClass CREST AUDIO safet y CD owner s manual user responsibility Your CD Series amplifier is very powerful and can be potentially dangerous to loud speakers and operators alike It is your responsibility to read important precautions see the inside front cover and make sure that the amplifier is installed wired and operated properly as inst
21. struktionen in der Bedienungsanleitung aufmerksam machen die Handhabung und W artung des Produkts betreffen VORSICHT Risiko Elektrischer Schlag Nicht ffnen VORSICHT Um das Risiko eines elektrischen Schlages zu vermeiden nicht die Abdeckung enfernen Es befinden sich keine Teile darin die vom Anwender repariert werden k nnten Reparaturen nur von qualifiziertem Fachpersonal durchf hren lassen ACHTUNG Um einen elektrischen Schlag oder Feuergefahr zu vermeiden sollte dieses Ger t nicht dem Regen oder Feuchtigkeit ausgesetzt werden Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen IMPORTANT SAFETY INSTRUCTIONS WARNING W hen using electrical products basic cautions should always be followed including the following Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a dry cloth Do not block any of the ventilation openings Install in accordance with manufacturers instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding plug The wide blade or third prong is provided for your safety If the provided plug does not fit into
22. t is inaudible in normal use In addition if extreme and sustained low impedance is encountered the amplifier s output relay will open AutoRamp Auto Ramp operates every time the amplifier is turned on or is reactivated after a protect condition is corrected T his exclusive C rest Audio feature gradually increases gain to the atten uator setting avoiding unnecessary stress on the loudspeakers Thermal Protect Abnormally high heat sink temperatures will engage the Protect circuit and disconnects the output relays During this time the Prot LEDs will light red The cooling fan will continue run ning at high speed Normal operation resumes once the amplifier cools to a safe level Short Circuit If an output is shorted i e defective speakers or crossed speaker wires the output relays will open and the channel will shutdown After approximately 2 seconds the channel will attempt an AutoRamp re start If the short is still present the cycle will repeat If the short is removed the channel will complete a re start and operate correctly DC Voltage If an amplifier channel detects DC voltage at its output terminals the output relay will immediately open to prevent loudspeaker damage The protect LEDs illuminate Subsonic Frequencies Built in high pass filtering provides subsonic frequency protection for each channel In addition a relay will open if excessive subsonic energy appears at the output CREST AUDIO service and support
23. 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 C hannel A s input produces output at Channel A s output while signal at Channel BS input produces out put at C hannel B s output Recommended minimum nominal load impedance for stereo operation is 2 O hms per channel parallel W hen set to Parallel mode program material applied to Channel AS input will appear at both ChannelA and B outputs The attenuators for ChannelA and B controls the level for channel A and B outputs independently of each other bridged Bridged mode straps both amplifier channels together to make a single channel monaural amplifier O ne channel pushes and the other pulls equally increasing the power output over that of either channel alone see Specifications Signal is applied to the Channel A input only C hannel AS attenuator is used to control signal level Use extreme caution when operating the amplifier in Bridged mode N ever ground either side of the speaker cable when the amplifier is in Bridged 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 imped ance in the Bridged mode is 4 ohms which is the equivalent
24. the equipment into an outlet on a d ircuit dif ferent from that to which the receiver is connected Consult the dealer or an experienced radio TV techni cian for help table of contents how to use this manual introduction installation unpacking mounting cooling and ventilation powering maintenance features overview front panel rear panel operation modes stereo contents parallel bridged connections input output safety tourclass protection precautions user responsibility service and support support contact us registration specifications block diagram appendices optional handle installation wire gauge charts CREST AUDIO how to use this manual i owners manual conventions terms official C rest 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 e warnings Procedures notto attempt A Issues or hazards to keep in mind when operating the equipment indicators W hat to look for on Jet the equipment display s Alerts indicators or prompts that may appear tips Preferred methods FEI Helpful hints Feature insights see see refers to other sections of the manual containing supplementary information on the current topic or a related issue note note supplementary feature information introduc
25. tion 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 for high operating efficiency and accurate sonic performance across the full audio bandwidth even under stressful conditions The Crest Audio CD series amplifiers utilize Class D amplifier technology which greatly improves the efficiency of the amplifier and reduces the power demand from the mains supply The CD amplifier incorporates a linear power supply design and are built to uncompromising standards This combined with major advances in amplifier technol ogy provides for extreme reliability and sonic accuracy for which Crest products are renown linear toroid power supply A traditional linear power supply is used in the CD Series Because of the amplifier sections efficiency approx 80 the transformer does not need to be as big or as heawy T his gives the CD Series an advantage in deliver ing more power in a more compact package The efficiency of the output stage also gives the power supply the ability to handle heavy duty cycles without compromising so
26. to driving both channels separately at 2 ohms AA A A see connections for examples of mode specific wirings or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment p 16 connections proper wiring schemes for connectors Speakon input binding post XLR 1 4 TRS Combi correct signal paths stereo parallel and bridged output Binding Posts Speakons CREST AUDIO connections am inputs CD amplifiers are configured standard with pin 2 hot on XLR inputs female XLR 1 Ground 3 Negative 2 Positive TRS pinouts Tip Positive Ring Negative Sleeve Ground 1 u outputs Speakers are connected using the high current five way binding posts speakon connectors or both Very high current is A stereo parallel bridged mono A available at the outputs Pi Si PNG Please connect your El ig gt output cable to the and IE 2 fo DEI p terminals of each sec tion precisely as shown A and B channel A Channel O NLY Speaker to PIN 1 Speaker to PIN 1 Speaker to PIN 1 Speaker to PIN 2 A channel also has B channel to PIN 2 B channel to PIN 2 Note This is useful in bi amp monitor situations see operation modes stereo mode five way binding post connectors parallel mode ve way binding post connector
27. ty TRS connector polarity bridged mono mode parallel mode stereo mode chassis ground lifted position chassis ground grounded position output connection remot output channel A stereo parallel channel B stereo parallel bridged mono five way binding post channel A stereo parallel bridged mono channel B stereo parallel features overview rear panel Output connections Speakers can be connected via the high current binding posts and the industry standard Speakon N L 4 connectors Binding posts O ne pair Red hot Black ground per channel Speakons O ne connector for each channel The Speakon connector for ChannelA also contains contacts for Channel B out put as well see O peration Modes Ground lift switch The recessed two position ground lift switch is used to isolate the amp s signal ground from the chassis AC ground The factory default setting is to the right Grounded To lift or disconnect the signal ground from the chassis AC ground slide the switch to the left N ever lift the ground prong on the AC connector Input connections Input signals can be connected to the amp via the Combi connec tors the 1 4 TRS connectors and the Female XLR pin 2 hot con nectors See Connections Mode selector switch This recessed three position switch configures the amplifier for Stereo Parallel or Bridged Mono operation The default factory setting is Stereo See operation modes Input sensitivity
28. ure when the This switch turns the amp on and off H the amp doesnt turn on when A ET is in the off the switch is in the ON position check the circuit breaker on the rear S panel CREST AUDIO p 11 features overview La NU _ CD owner s manual SAN Ee 2 Designed and manufactured H Input Y N 24 Pos 1 Pe D gt Outputs Ina 8 Inputs in the USA by FEN a S m BeNegl2 hegi lass 2 Wiring Mode CREST L B AB AB pa silts Je ils Al Pini Sleeve E AUDIO be Pin2 Tip Stereo Pins Ring y Bridges rest Audio Inc Fair Lawn New Jersey www crestaudio com AAA NI NY Wg rear panel p 12 IEC power connector Accepts a standard IEC terminated power cable Breaker Resettable circuit breaker no fuses are used Breaker can trip due to a power surge or over voltage condition If it trips once reset it If it continues to trip the amplifier may need servicing Fan The fan operates continuously while the amp is on An internal temperature sensor increases the speed of the fan during high temperature conditions Air enters through the rear of the amp and exits through the front grill Be sure to allow adequate air flow from the rear of the rack the amp is mounted in rear panel legend o Ai o gt aioe U gt D G gt gt wd oo o Se input connection XLR connector polari
29. 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 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 wave forms applied to the speakers T he amplifier will however allow normal musical transient bursts to pass O f course when the amplifier does clip it is operating at its maximum output power N ote that some speaker systems are packaged with proprietary processors that have power limiting circuits and therefore should not require additional limiting Do not drive any low frequency speaker enclosure with frequencies lower than its own tuned frequency the reduced acoustical damping could cause a ported speaker to bottom out even at moderate power Consult the speaker system specifications to determine its frequency limits and employ a roll off filter if necessary recommended speaker cabling The wire gauge charts will assist you in determining the optimum copper wire gauge for your speaker cables Remember that the speaker cable resistance robs amplifier power in two ways through power lost directly to resistance often referred to as IR loss and through increased total load resistance which decreases the amount of power
30. your outlet consult an electrician for replacement of the obsolete outlet 10 Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point they exit from the apparatus O nly use attachments accessoriegs provided by the manufacturer Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus W hen a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over ODA OWO OUEN E so Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped 15 N ever break off the ground pin W rite for our free booklet Shock Hazard and Grounding Connect only to a power supply of the type marked on the unit adjacent to the power supply cord 16 If this product is to be mounted in an equipment rack rear support should be provided 17 Exposure to extremely high noise levels may cause a permanent hearing loss Individuals vary considerably in susceptibility to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficient
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