CKi Series Owner`s Manual
Contents
1. f a RG Mode x20 e Output Class 2 Wiring Operation STO Daisy Chaining Out In Out Standard CKi Power Processing amplifiers come with a blank panel installed in the N etwork bay The amplifier must not be operated without a Network module or blank panel in place A Removable modules contain static sensitive devices handle modules only at static safe work stations A Safety The owner s role in amplifier safety Protecting your speakers Description of protection features OS ALI User Responsibility Speaker Protection Protection Features Safety User Responsibility Your CKi Series amplifier is very powerful and can be potentially dangerous to loudspeakers and operators alike It is your responsibility to read all precau tions and make sure that the amplifier is installed wired and operated properly as instructed in this manual Many loudspeakers can be easily damaged or destroyed by overpowering espe cially with the high power available from a bridged amplifier Always be aware of the speaker s continuous and peak power capabilities C rest Audio is not responsible for damage to loudspeakers for any reason Speaker Protection All loudspeakers have electrical thermal and physical limits which must be obser ved to prevent damage or failure Too much power severely clipped wave forms low frequencies applied to h2. p 19 Any number of CKi amplifiers can be daisy chained together for sequential turn on W iring two amplifiers for STO is as simple as con necting the O n Com and O ff pins of the STO O ut connector on the first amplifier to the corresponding pins on the STO In con nector on the second amplifier Repeating this wiring scheme with sub sequent amplifiers allows entire systems of CKis to be wired for STO Modules CKi amplifiers come standard with a blank panel fixed over the module bay W hen a N exSys module is installed in this bay connection to a network is made via a standard RJ 45 connector and CAT 5 Ethernet cable p 20 Module Removal Installation The amplifier must be switched off and unplugged from the AC mains supply before any module operation is undertaken Two Phillips head Screws secure the module panel to the chassis T he module is connect ed electrically to the amplifier with a singe multi pin ribbon cable O nce unscrewed from the chassis unplugging the module from this ribbon cable frees the module for removal To insert a module simply reverse this procedure See Chapter 7 N exSys Modules for more information Module Bay with Blank Panel Installed ChA ChB otect i tot 775V 0dB HBHHEBBH I Input Gain OO LP Address O Amp ID Gain A C Temperature Fault OAC Voltage O Mute CREST AUDIO
3. Operation Amplifier ID Condition Monitoring NexSys Modules Overview The extended capabilities of CKi amplifiers are reached when connected to a N exSys amplifier network via a N exSys module These modules reside in the CKis module bay and provide control monitoring and signal processing fea tures This chapter covers the installation of N exSys modules as well as infor mation concerning computer control of a exSys system For more informa tion about controlling a system with N exSys refer to the N exSys System Manual Module Installation There are two modules through which a CKi amplifier can be connected to a N exSys network the N xEthernet Module and N xCobranet Module Although they have different feature sets they both serve the networking func tion Because of this they are collectively referred to as network modules The installation procedure for both is the same 1 Remove the blank panel covering the CKi s module bay by removing the screws on either side of the panel Save these screws as they will be needed for fastening the network module 2 Inside the exposed module bay you should see the ribbon cable con nector on the amplifier s circuit board N ote of the way the connector is keyed and position the ribbon cable to match Insert the cable into the connector with the opposite end hanging out of the module bay 3 Position the network module right side up Connect the exposed end of the ribbo
4. RET 0 0 LUS WL Ul N u U On m Protect ACL ACL 5 off status cha che CREST AUDIO A Maya Signal Signal CKi 100s Professional Power Amplifier 9 Remote mu Ca m Z 3 Rear View 17 432mm USCH WL 2g e SISK SA A sob t S o dB oe HH if IHIHBHJ n o In Out ChA Ul N EEN Ul d AUDIO rimo d WwW p em uw uie S 3 YT uggT GZS Cuu6s ss CREST AUDIO Installation Cooling Requirements CKi amplifiers use a forced air cooling system to maintain a low even operating tempera ture Air drawn by a fan mounted behind the front panel enters through the front grille and the heated air exits through the side panel ports O n two an three space CKi amplifiers the fan will remain inactive until operating temperature rises to 45 C O ne four space units the fan runs all the time Make sure that there is enough space around the front of the amplifier to allow air to enter and around the sides to allow the heated air to exit System cooling needs must be considered before installation and the system installer designer should specify appropriate countermeasures such as ventilation air conditioning etc Refer to A ppendix A for specific thermal emission figures N ote If the amplifier is rack mounted do not use doors or cov
5. 6 2 4 0 2 5 1 60 1 01 0 60 11 9 7 1 5 0 3 2 2 0 1 20 Power Loss 4Q load 1 61 1 02 0 64 0 40 0 25 3 2 2 0 1 28 0 80 11 9 7 1 5 0 3 2 2 0 1 20 22 14 6 9 6 6 2 4 0 24 20 load 3 296 2 0 1 28 0 80 0 51 6 2 4 0 2 5 1 60 22 14 6 9 6 6 2 4 0 2 4 37 26 17 8 11 8 7 1 4 7 p 39 OQCREST http Awww crestaudio com CKi Owner s Manual Version 1 0 3 14 04 AUDIO
6. AC ground as the ampli fier s In some cases however particularly if an amplifier is being installed in an existing system this may result in a ground loop creating excessive 60H z hum at the amplifier s output If this happens slide the ground lift switch on the amplifier s rear panel to the open left position In this position the sig nal ground is lifted from the chassis ground and is clamped to 0 6V D o not lift the ground if the amplifier and the signal source equipment are not on the same AC ground In a properly designed system the amplifier should receive its ground from the AC line cord to ensure safety and minimize noise Sequential Turn On Off STO CKi amplifiers come standard with Sequential Turn O n Turn O ff STO cir cuitry W hen the amplifier front power switch is set to remote a single SPDT toggle switch or two SPST momentary switches can be used to turn the amplifier on and off Using the same switch es additional amplifiers can be turned on off sequentially by daisy chaining the STO O ut terminals of one amplifier to the STO In terminals of a subsequent amplifier T he stan dard turn on delay time between amplifiers is approximately 100ms turn off delay time is 200ms W hen using N exSys control with an amplifier equipped With an N xEthernet or N xCobraN et module these standard turn on and turn off delay times may be modified in the control software Standard Sequential Turn On Turn Off Wiring
7. Signal Control W henever a CKi Series amplifier powers up or comes out of a protect mode the Auto Ramp circuit activates W hile the speakers are discon nected the Auto Ramp circuit fully attenuates the signal After the out put relay closes the signal slowly and gradually raises up to its set level PowerSave All CKi amplifiers come standard with PowerSave circuitrywhich reduces current draw and thermal emissions at idle PowerSave oper ates by cutting off the bias current to the output stage when signal is no longer sensed at the input W hen signal appears bias current is instantly restored after the first positive going waveform C urrent draw specifi cations while PowerSave is active are included in specifications under Idle Current D raw NexSys Fault Monitoring A CKi equipped with an N xEthernet or N xCobraN et module and con nected to a N exSys network will report fault conditions to the PC con trolling the network If a networked amplifier enters ACL or IGM or experiences a thermal DC voltage or short circuit fault the fault con dition will be reported the PC interface T his allows easy monitoring of amplifier operating conditions across a large or widespread network from a single location NexSys Modules General module information Installing a module Individual module features Usinga module Setting amplifier IDs Amplifier monitoring via modules OS ALI Overview Installation Features
8. 3D 03E 03F HEX TO DECIMALCONVERSION TABLE Hex 040 041 042 043 044 045 046 047 048 049 04A 04B 04C 04D 04 04 050 051 052 053 054 055 056 057 058 059 05A 05B 05C 05D 05E 05F 060 061 062 063 064 065 066 067 068 069 06A 06B 06C 06D 06 06 070 071 072 073 074 075 076 077 078 079 07A 07B 07C 07D 07E 07F Dec 0064 0065 0006 0067 0068 0069 0070 0071 0072 0073 0074 0075 0076 0077 0078 0079 0080 0081 0082 0083 0084 Network Reference Hex 080 080 081 082 083 084 085 086 087 088 089 08A 08B 08C 08D 08E 08F 091 092 093 094 095 096 097 098 099 09 098 09C 09D 09 09 0A0 OA1 0A2 0A3 0 4 0 5 0 6 0A7 0A8 0A9 OAA DAD DAC OAD OAE OAF OBO D I 0B2 0B3 0 4 085 086 0B7 0B8 089 OBA OBB OBC OBD OBE OBF Dec 0128 0144 0129 0130 0131 0132 0133 0134 0135 0136 0137 0138 0139 0140 0141 0142 0143 0145 0146 0147 0148 0149 0150 0151 0152 0153 0154 0155 0156 0157 0158 0159 0160 0161 0162 0163 0164 0165 0166 0167 0168 0169 0170 0171 0172 0173 0174 0175 0176 0177 0178 0179 0180 0181 0182 0183 0184 0185 0186 0187 0188 0189 0190 0191 Hex 0CO DCH 0C2 0C3 0C4 0C5 0C6 0C7 0C8 0C9 OCA DCH DCD DCE OCF 0D0 0D1 0D2 0D3 0D4 0D6 0D7 0D9 ODA 0 oDC ODD ODE ODF 0E0 D I DEZ DEZ DEA DER DEG DEZ DES DES DEA DER O
9. CREST AUDIO CKi Amplifier Owner s Manual Signal Signal CREST AUDIO CKi 800s Professional Power Amplifier Q 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 A 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 N o 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 iNO ABRIR PRECAUCION Para d
10. EC OED OEE OEF OF1 DEZ OF4 OFS OF7 OF8 OFA OFB OFD OFE OFF Dec 0192 0193 0194 0195 0196 0197 0198 0199 0200 0201 0202 0203 0204 0205 0206 0207 0208 0209 0210 0211 0212 0213 0214 0215 0216 0217 0218 0219 0220 0221 0222 0223 0224 0225 0226 0227 0228 0229 0230 0231 0232 0233 0234 0235 0236 0237 0238 0239 0240 0241 0242 0243 0244 0245 0246 0247 0248 0249 0250 0251 0252 0253 0254 0255 p 37 p 38 Wire Gauge Stranded Cable Length Qu E 1 0 meter 5 3 0 meters Wire Gauge 0 3mm 0 5 0 75 1 5 2 5 4 0 0 5mm 0 75 1 5 2 5 4 6 0 5mm 0 75 1 5 2 5 4 6 0 75mm 1 5 2 5 4 6 10 8Q 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 4Q 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 5 5 10 8 5 6 2 9 1 74 1 09 0 73 15 5 9 8 6 3 4 3 2 6 20 load 10 896 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 Wire Gauge Stranded Cable Length SE 5 feet 1 0 40 feet 80 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 8Q load 0 81 0 32 0 20 0 128 1 61 1 02 0 64 0 40 0 25
11. For non N exSys remote turn on a single SPDT toggle switch or two SPST momentary switches can be used In either case the switch es are wired to the STO In connector on the amplifiers rear panel and the amplifier s front panel power switch must be set to Remote The switch es should be wired to close a connection between C om and O n pins for turn on and between the Com and O ff pins for turn off The diagram below illus trates the circuit NY Sequential Turn On V In Fault S gu oque eoe SSS APL cS Active e e p E E In Out In Out Output Class 2 Wirinc 775V 0dB X20 eX40 Gain Bw uu The shield on a bal anced input line should A be grounded at one end only usually the sending end and it must never be relied on to supply ae ground to the ampli ler W hen using N exSys control hardwiring E for manual switch closure between ampli fiers should be used cau tiously If the switch clo sure output is wired up it W ILL cause the next amp to switch regard less of which source hardware switch or N exSys STO command has initiated the com mand
12. I e Very high current is and to not exceed the maximum output rating of your C Ki amplifier EE the outputs A Output Barrier Strip Please connect your output cable to the and terminals of each section precisely as shown See the wiring diagrams on the next two pages for more information on connecting your CKi amplifier p 16 Stereo Mode Direct Outputs eration Kee M Designed and manufactured in the USA by CH CREST Crest Audio Inc Fair Lawn NJ USA AUDIO www crestaudio com r AB A Sequential Turn On V In LE APO KY SIS SHIH Por Sa Fault r Active JE gaene FEI Out In Out ut Clase 2 willns Parallel Mode Direct Outputs Bridge Stereo Mode ox 30 Parallel Ch A 775V 0dB 205 x40 Gain vyd aud AN Designed and manufactured in the USA by Crest Audio Inc Fair Lawn J USA AUDIO www crestaudio com a Sequential Turn On V In Fault EN SIF oft Se Q S LIL Active 11 1 HIH H HH HH HIR I Z ge HHHEHEEHBHEBHES In Out In Out Bridged Mono Mode Direct Outputs Designed and manufactur
13. al fan will keep the amplifier operating well within its intended temperature range under normal conditions If a channel s heat sink temperature reaches 75 C which may indicate an obstruct ed air supply that channel will independently protect itself by discon necting its load and shutting down until it has cooled During this time the Protect LED will light the Active LED will extinguish and the cooling fan will run at its highest speed Short Circuit If an output is shorted the IGM and thermal circuits will automatical ly protect the amplifier The IGM circuit senses the short circuit as an extremely stressful load condition and attenuates the signal protect ing the channels output transistors from over current stress If the short circuit remains the channel will eventually thermally protect itself by disconnecting the load DC Voltage Protection If an amplifier channel detects DC voltage or subsonic frequencies at a channel output the respective output relay will immediately open to prevent loudspeaker damage The Protect DC LED will light SE p 23 p 24 Safety Turn OryTum Offf Protection At power up the amplifier stays in the protect mode with outputs dis connected for about six seconds while the power supplies charge and stabilize W hile the output relays are open the ACL LEDs will light W hen the power is turned off the speaker loads immediately discon nect so that no thumps or pops are heard Auto Ramp
14. closure for remote turn on and to other CKi amplifiers for sequential turn on STO Fault Connector This output is a contact closure that can be used to report a fault con dition e g an open output relay in the amplifier EHE cir Lu dub pak 775V Input Gain Rear Panel Legend Ground Connected Ground Lifted Channel A stereo parallel Bridged mono Channel B stereo parallel Input Polarity N ever connect a hot red output to ground A or to another hot red output Rear Panel cont Output Connectors A barrier strip provides output connection terminals for two speak ers operating in stereo or parallel for a single speaker wired in a bridged mono configuration or for constant voltage distribution Bare wire or spade lugs may be used to make barrier strip connections Ground Lift Switch This switch disconnects the audio ground from the chassis ground in the amplifier Module Bay All CKi amplifiers possess a module bay configured to accept inter changeable plug in modules Your amplifier may have been factory configured with a module Information on all C Ki modules is available in this manual See Chapter 7 N exSys Modules for more information Mode Select Switch This switch reconfigures the amplifiers outputs for stereo parallel or bridged operation Input Attenuators Each channel has an attenuator knob to adjust the channels output fr
15. dard CAT 5 Ethernet cabling using and RJ 45 connector For a more robust connection use a N eutrik EtherC ong connector All C Ki network modules are equipped to accommodate this more robust solution W hen the cable has been physically connected to the module and to an active network device the Link LED will illuminate Setting IP Addresses Press the Function button until the LED next to I P Address illuminates Once the function has been chosen depressing the Select button will For instructionson SH scroll through the four octets of the I P Address The position of the decimal point in the numeric display designates which octet has been complete network selected If the decimal point is to the left of all three digits then the please see Appendix C first octet is being displayed If the decimal is between the first and second digit the second octet is being displayed and so on Once the appropriate octet has been selected press the Edit button The octet value will begin flashing Press the increment and decrement buttons to change the octet value T here are 256 possible values for each octet ranging from 0 to 255 0 nce the correct value has been reached press the Edit button again to register the value and exit edit mode If another octet value must be changed select it using the Select button and repeat the editing procedure Setting the I P Address to 000 000 000 000 will enable DHCP for this Nx E
16. dow This space shipped standard with a blanking panel installed can accom modate various add on options to the network module including the N xD SP signal processing module RJ 45 Network Connector The N eutrik EtherC ong ruggedized RJ 45 connector allows connec tion of the CKi amplifier to an Ethernet network The jack accommo dates a standard male 45 connector or the male EtherC ong con nector Data amp Link LEDs The Data LED will flash when data packets are being sent or received by the module The Link LED will light when the module detects that it is connected to an Ethernet network NxCobranet The N xCobranet module varies in appearance only in the fact that above the RJ 45 connection NxCobraNet appears instead of N xEthernet p 28 NexSys Modules Module Operation The following pages contain information on how to operate the N xEthernet and N xCobraN et modules The N exSys functions that can be controlled from the amplifiers rear panel will be explained After working through this section you should have an understanding of the network modules opera tion through hardware For more on software control of the modules fea tures see the N exSys Manual The instructions in this chapter assume that a module has been mounted in the CKi amplifier and the user has a working knowledge of the modules control panel layout Making Network Connections The Network modules are connected to the network via stan
17. e Chapter 5 O peration for more information on power considerations 5 Turn the front panel three position AC switch to on and bring up the rear panel gain attenuators to the desired level CKi Power Processing amplifiers are 2 3 amp 4 rack space units of 17 1 8 437mm depth that mount in a standard 19 inch rack O n 2 amp 3 rack space units four front panel mounting holes are provided 4 rack space units have eight front panel mount ing holes Rear mounting ears are also provided on all amplifiers for additional support which is essential in non permanent installations like mobile or touring sound systems and recommended for permanent installations D istance from the back of the front rack ear to the center of the rear mounting ear holes is 16 5 8 422mm Because of the cables and connectors on the rear panel a right angle or offset screwdriver or hex key will make it easier to fasten the rear mounting ears to the rails For replacement call Crest E Audio s C ustomer Service Department directly See service and support Be certain that there is enough space around the the amplifier 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 In racks with closed backs allow at least one standard rack space opening for every four amps Installation Front View h 19 483mm
18. e displayed with a designation of F for degrees Fahrenheit or C for degrees Celsius To change the units that the temperature is displayed in press the Select button AC Line Voltage Use the Function button to choose AC Voltage The AC line voltage will be displayed p 30 NexSys Modules SE Service Support amp Warranty When to get support Support Waysto contact Crest Audio Contact Crest Warranty SE Service Support amp Warranty Support In the unlikely event that your amplifier develops a problem it must be returned to an authorized distributor service center or shipped direct ly to our factory Because of the complexity of the design and the risk of electrical shock all repairs must be attempted only by qualified tech nical personnel If the unit needs to be shipped back to the factory it must be sent in its EE original carton If improperly packed the unit may be damaged na cil Crest To obtain service contact your nearest Crest Audio Service Center Audios Customer Service Distributor Dealer or any of the worldwide Crest Audio offices For those with Internet access please visit the Crest Audio web site Contact Crest Customer Service Phone 201 475 4600 USA Fax 201 475 4677 USA Email customerserve crestaudio com Technical Support Phone 201 475 4600 USA Fax 201 475 4632 USA Email techserve crestaudio com Web Site www crestaudio com Postal Mail Crest Aud
19. ed in the USA by CREST Crest Audio nc air Lawn AUDIO www crestaudio com AB Sequential Turn on V In Fault lt PPO Ke 1 SIS SHS oF SKS a marr E Edit Select Function O Amp ID Gain DLP Address BRETT 275 A Stereo 3 OdB P 30 Ael Ty Bridge Parallel o6 Sep 205 ex4o Nx Ethernet Edit Mode Select Function Stereo Bridge Mode Parallel o6 ChA ChA ChB Gain Vu Ethernet CREST AUDIO VU Stereo Mode Constant Voltage Output V amp X Models only Operation OLP Address amp ID OAC Voltage Sequential Turn On V In Fault S SIE SH PRL Parallel Mode Constant Voltage Output v amp x Models only Gain A OTemperature Faul CREST AUDIO A 5 Fault 5 Mute O ChA ChB 775V 0dB KSE Gain Sequential Turn On V In Fault m SIF SIG e t tC 10 z mion F Stereo i She HHHHHREHEEJHHR E suse M pati a cO a In Ou In Out Oufput Clase 2 Willng E E Mode ChA ChB CV Line Ch A CV Line Ch B Removable Attenuator Knob
20. el CKi 800s shown O a ge dat ss 65 CREST AUDIO Remote CKi 800s Professional Power Amplifier 1E a p O Front Panel Rack Mounting Ears Two holes four on 4U amplifiers are provided on each front mount ing ear 3 Position Power Switch With this switch in the up position the amplifier is O n The middle position is Off and the lower position is marked Remote W hen Switched to Remote the amplifier must be activated by the sequential turn on turn off STO circuit Protect LED If the amplifier enters any of its Protect modes the output relay will open and this LED will light Active LED The Active LED indicates the amplifier is turned on and the output relays have closed ACL LEDs Each channel has an ACL Active Clip Limiting LED If a channel reach es the clipping point this LED will light to show that the ACL circuit is active Features Overview Front Panel cont Signal LEDs Each channel has a Signal LED The intensity of the light varies with sig nal level the stronger the input signal the brighter the LED Fan Grille amp Filter A DC fan draws air into the amplifier though the removable dust fil ter Do not block this intake The fan operates only when the amplifi er requires cooling Fan filters are easy to remove and should be cleaned regularly to ensure optimum performance Contact your Crest Repr
21. ers on the front or rear without pressurizing the rack Make sure that heated air can escape freely and that there is no resistance to the intake of cool air Intake and exhaust air must flow without restriction Fan filters should be regularly cleaned and periodically replaced Circuit Size Requirements CKi amplifier power requirements are rated at idle 1 8th power typical music condi tions 1 3rd power and maximum rated power The maximum power current draw rating is limited by the amplifier s circuit breaker Consult A ppendix A for the current that each ampli fier model will demand AC mains voltage must be the same as that indicated on the rear of the amplifier Damage caused by connecting the amplifier to improper AC voltage is not cov ered by any warranty PowerSave All CKi amplifiers come standard with PowerSave circuitr y T his effectively reduces current draw and thermal emissions to a minimum when the amplifier is at idle PowerSave operates by cutting off the bias current to the output stage after absence of signal is sensed at the input W hen signal presents itself PowerSave instantly restores the bias current after the first positive going waveform Current draw specifications while PowerSave is active are included in specifications under Idle C urrent D raw Maintenance CKi amplifiers require little routine maintenance W hen used in an extremely dusty or smoky environment the unit should be periodically bl
22. esentative to obtain replacement filters Side Panel Exhaust Ports Heated air exits through the exhaust ports on the sides of the ampli fier chassis Do not block these ports Warm Air Warm Air y Side View QS ALI 9 Features Overview Rear Panel CKi 100s shown Sequential Turn On V In Fault ah gb O C SIF SIE GPL IT ZAR GActive FF IIIB 2 D J ote HHHBHHBHHEBH il J In Out In Out Output Class 2 Wiring d ur Mode gt J Rear Panel p 10 Mains Breaker 2U amp 3U amplifiers have a push type circuit breaker while 4U units have a throw switch style breaker If the units breaker trips repeatedly the amplifier needs servicing IEC Power Cord Connector On 2U amplifiers a standard IEC power connector is located on the rear panel of amplifier T he connector accommodates a standard IEC line cord included in the amplifier box Should this cord need to be replaced only a cord with the same current rating should be used 3U amp 4U units have a captive power cord AC Mains Active LED indicators The AC mains yellow LED indicates that the amplifier is attached to a power source T he active green LED indicates that the amplifier has been turned on and is operating Sequential turn on off Connectors These connectors can be wired to a contact
23. fuses have a significant series resis tance that could degrade the amplifiers damping of the speaker s motion and may even deteriorate the system s sound quality If you elect to use fuses check with the speaker manufacturer to determine the proper current rating and time lag required 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 The wire gauge charts in Appendix D will assist you in determining the opti mum copper wire gauge for speaker cables in direct output systems Speaker cable resistance robs amplifier power in two ways through power lost directly to resistance often referred to as I2R loss and through increased total load resistance which decreases the amount of power available from the amplifier Appendix D gives cable length figures in feet AW G wire gauges and in metric values p 22 Safety Protection Features CKi Series amplifiers incorporate several circuits to protect both themselves and loudspeakers Crest Audio has attempted to make the amplifiers as fool proof as possible by making them immune to short and open circuits mis matched loads DC voltage and overheating If a channel goes into ACL gain reduction mode the speaker load will remain connected but clipping percent age or output p
24. ged Constant Voltage Q p 15 Power Input O utput STO aat tome ek bre pd p 21 User Responsibility Speaker Protection Protection Circuitry NexSys Modules p 25 Introduction Installation Module Features Module O peration Service Support amp Warranty p 34 Support Contact Crest W arranty SpecificationS p 35 ConstantVoltage p 36 Network Reference p 37 Wire Gauge Chart p 38 Table Of Contents Contents Appendices How to use this manual Introduction Congratulations on your purchase of a Crest Audio CKi Intelligent Power Processing amplifi er Please read this manual carefully as it contains information vital to the unit s safe opera tion Also please fill out and return the enclosed product registration card CKi amplifiers represent a new level of value and flexibility never before offered to the con tracting market S Series models are designed to drive low impedance speaker loads while V Series models feature a unique front end circuit to provide directly coupled 70 7 volt out puts eliminating the need for step up transformers X Series models feature transformer iso lated outputs for 100V operation 50V optional Together these amplifiers cover almost every conceivable installed or distributed sound power requirement The C Ki family is everything that
25. hooses between C hannel A and B W ith the proper channel selected press the Edit button The increment and decrement buttons will now adjust the channels gain If the channel has been muted by N exSys the first press of either the increment or decrement will bring the channel out of mute and return its previous value Subsequent presses will adjust OLP Address O Amp ID O Gain Temperature OAC Voltage Edit Select Function Amplifier channels can Si the gain value O nce the gain has been adjusted pressing the Edit but not be muted from the ton again will lock in the value and the display will stop flashing module con rols Channels can only Gain values are listed in dB from 0 unity to 80 The setting of the BS Soap procedure described amplifier s attenuators will also affect the overall gain The attenuators are positioned after the exSys gain control in the amps gain structure resulting in an additive attenuation value For example if an attenuator is set to 6dB and the N exSys gain for that channel is set to 10dB the amplifier s overall gain will be 16dB below the amplifiers maximum ouput Condition Monitoring These functions do not make use of the Edit and increment decrement buttons They simply provide information concerning the amplifier s operating condition Temperature Use the Function button to choose Temperature The internal ambient temperature of the amplifier will b
26. igh frequency drivers and DC voltage can all be fatal to cone and compression drivers Crest Audio CKi Series amplifiers automatically protect speakers from D C voltages and subsonic signals Be sure that the low and mid bands of an electronic crossover are connected to the correct amplifiers and drivers and not accidentally connected to those for a higher frequency band The amplifier s clipping point is its maximum peak output power and some of the higher powered CKi Series amplifiers can deliv er 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 the speakers never receive excessive power and that the amplifier never clips use a properly adjusted external limiter or a compressor with a ratio of 10 1 or higher to control power output in systems with active elec tronic crossovers use one for each frequency band The clip limiter will auto matically 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 W hen the amplifier does clip it is at its maximum output power Some speaker systems are packaged with processors that have power limiting circuits and should not require additional external limiting Fuses may also be used to limit power to speaker drivers although as current limiting rather than voltage limiting devices Some poor quality
27. inals Use extreme caution when operating in the bridged mode as potentially lethal voltage may be present at the output termi nals Unlike the stereo and parallel modes in which one side of each output is grounded both sides are hot in bridged mono mode Channel A 5 side is the same polarity as the input N ever ground either side of the speaker cable when the 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 Constant Voltage CKi V and CKi X Series amplifiers are designed for use with distributed or constant voltage systems These amplifiers can also be wired for Bridged Mono mode operation however bridging these models is usually undesirable as the output will be approximately 140V CKi V or 200V CKi X There are how ever specific applications for this configuration Contact Crest Audio C ustomer Service for more information if required See Appendix B for information on recommended distributed line imped ance p 14 Stereo Bridge e eParallel Mode Connecting amplifier outputs to oscillo scopes or other test equipment while the amplifier is in bridged mode may damage both the amplifier and test equipment Regardless of operating mode NEVER con nect amplifier outputs directly together Operation Connecting the amplifier to AC power Pro
28. io Inc 16 00 Pollitt Drive Fair Lawn NJ 07410 USA Warranty Your Crest Audio Amplifier is covered against defects in material and workmanship Refer to the warranty card provided with this manual for more details p 34 Specifications CKi Series S Models Stereo Power per channe N A both channels driven 2Q 4 150W 89 100W Bridge Power AO 600W 400W N A 1100W 900W 600W 2200 80 200 800 1800 Maximum outpu 64V 78V Voltage Swing N N e N N e vs un Frequency Response 1W 80 Power Bandwid T n o E N o E o K a 400 1 gt 60dB 141V Damping Factor 80 Input cmrr Input sensitivity 4Q rated output power 40x Input sensitivity 4Q rated output power 20x Input impedance Hum and noise A weighted rated power 80 Crosstalk 1kHz at rated power 8Q Class T H D N 2x49 1kHz Current draw 1 8 power 120Vac Current draw 1 3 power 120Vac 2 82V balanced gt 10kQ u 105dB A weighted gt 60dB 1kHz gt A 4 gt A E A 10 0 14 8A ont panel mounted Connectors i 1 0 sequential turn rs AC mains circuit ground lift switches L one per ch Prot Protection i antaneous gain mod d DC voltage m iw 5 a Ii EI o Lo age Double thickne Imperial Di
29. ion turn the amplifier off and set the Mode Select Switch to the stereo position In this mode both channels operate inde pendently of each other with the input attenuators controlling each channel s level Thus a signal at Channel AS input produces an amplified signal at C hannel A s output and the same for Channel B Parallel For parallel dual channel single input operation turn the amplifier off and set the Mode Select Switch to the parallel position both amplifier channels will now be driven by the signal at Channel A s input No jumper wires are needed O utput connections are the same as in the stereo mode In the parallel mode only Channel A s input is active Channel B5 input is not in the circuit Both attenuators remain active permitting different levels for each channel Power and other performance specifications are the same as in the stereo mode Bridged Mono For Bridged single channel single input operation turn the amplifier off and set the Mode Select Switch to the Bridge position This Mode straps both amplifier channels together making a very powerful single channel O ne channel pushes and the other pulls equally effectively quadrupling the power of either channel alone As in Parallel mode signal is connected to Channel A The nature of Bridged mode requires that both attenuators be set at the same level preferably at OdB attenuation The speakers are connected only to the designated output term
30. isminu r el riesgo de descarga el ctrica no abra la cubierta o hay piezas utiles dentro D eje todo mantenimiento en manos 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 l utilisateur la pr sence d une tension dangereuse pouvant tre d amplitude suffisante pour constituer un risque de choc lectrique Ce symbole est utilis dans ce manuel pour indiquer l utilisateur qu il ou qu elle trouvera d importantes instructions concernant l utilisation et l entretien de l appareil dans le paragraphe signal ATTENTION Risques de choc lectrique NE PAS OUVRIR ATTENTION Afin de r duire le risque de choc lectrique ne pas enlever le couvercle ne se trouve l int rieur aucune piece 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 A vant 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 G eh uses warnen die von Ausreichender St r
31. ke sind um einen elektrischen Schlag verursachen zu k nnen T Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam machen die Handhabung und W artung des Produkts betreffen VORSICHT Risiko Elektrischer Schlag N icht ffnen VORSICHT Um das Risiko eines elektrischen Schlages zu vermeiden nicht die Abdeckung enfernen Es befinden sich keine darin die vom Anwender repariert werden k nnten Reparaturen nur von qualifiziertem Fachpersonal durchf hren assen 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 Oor eh Y UT Ro Ode Kat 15 16 17 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
32. mensions 35x19x 173 525 x 19 x 173 70x 19x 173 Metric Dimensions 89 x 483 x 435 134 x 483 x 435 178 x 483 x 435 N et Weight Ibs kg 34 44 15 64 58 20 26 42 78 65 35 39 Gross W eight Ibs kg NJ to 55 Pei Wi wW en 9 N 5 S NJ MN ES e gt 5 LT N e 69 All power measurements made at 120 VAC 2 Ohm sine wave power is time limited by magnetic circuit breaker and internal protection circuit SE p 35 Constant Voltage A distributed or constant voltage system as shown in the figure below uses loudspeaker step down transformers for each speaker The transformers are designed to deliver a specific power level into a spe cific load impedance when a specific voltage the example here uses 70 7 volts appears at the primary A speaker transformer usually has taps on its primary secondary or both so it can be used for several different power levels or speaker impedances Each speaker step down transformer converts the low impedance of its loudspeaker to a rela tively high impedance as seen by the distributed line C onsequently loads can be added or subtracted to the distributed line with very lit tle effect on the actual line voltage hence the term constant voltage Te SCH line load Z that the amplifier sees is determined by the ormula Z V2 P where P is the sum of the loudspeaker power taps compensated for transformer insertion loss P X xfrmr 1 P
33. n cable to the connector on the module again taking note ofthe keying of the connectors 4 Slide the module into the bay and fasten it to the C Kis chassis with the screws removed in Step 1 Edit Select Function p 26 NexSys Modules Module Features This following pages describe the buttons indicators connectors and func tional components that are relevant to the two exSys modules These fea tures exist on both the N xEthernet and N xCobranet Modules Features specific to the N xCobranet Module are discussed later in this chapter Nx Ethernet N CREST Address AUDIO O Amp ID O Gain A B A A O Temperature Fault Se Sal e OAC Voltage c Mute Edit Select Function x e 4 character Display The LED display shows the value of the current parameter for the function chosen The selected Function is indicated by the corre sponding LED Edit Button Enables and disables editing of a function parameter W hen pressed the value in the display will flash indicating that edit mode has been entered T he value can now be adjusted using the increment and decre ment buttons Pressing Edit again will register the value and stop the flashing of the display Select Button W hen a function parameter exists for both channels independently e g Gain Temperature
34. om to maximum power Status LEDs The Protect Signal and ACL LED s on the rear panel serve the same function as the front panel LED s of the same names The IGM LED will light if the amplifier s IGM protection circuit engages Input Connectors The CKi uses one 3 pin Phoenix connector per channel for balanced line level audio input These inputs can also be setup to accept an unbalanced signal Gain input sensitivity Select Switch This switch sets the amplifiers gain structure as constant sensitivity 0dB setting or constant gain x20 or x40 settings SE Features Overview Do not adjust the mode selection switch A while the amplifier is turned on In situations where an UN BALANCED sig E nal is fed to the amp it s important to ground the unused input If the inverting input of an amp channel is left float ing the gain will drop by 3 dB p 11 Choosing the appropriate mode Switching between operation modes Special considerations when using bridged mode Connecting to a constant voltage Line SE Modes Stereo Parallel Bridged Constant Voltage Modes Mode Selection The rear panel Mode Select Switch determines whether the amplifier is in stereo parallel or bridged mono mode Do not operate the Mode Select Switch with the amplifier on See the next chapter on O peration for proper wiring in each mode Stereo For stereo dual channel operat
35. ower will be instantly reduced W hen a problem occurs that causes a channel to go into a protection mode the Protect LED for that channel will glow DC voltage on the output excessive subsonic frequencies or thermal overload will cause the channel s output relay to open discon necting the speaker load until the condition is corrected Automatic Clip Limiting ACL Any time a channel is driven into continuous clipping the clip limiter circuit will reduce the channel gain to a level just slightly into clipping which protects the speakers against the damaging high power contin uous square waves Situations that may activate the clip limiter include uncontrolled feedback oscillations and improper equipment setting or a malfunction upstream from the amplifier Norma program tran sients will not trigger the clip limiter only steady excessive clipping will The ACL LED will glow brightly and continuously when limiting occurs IGM Impedance Sensing CKi Series amplifiers feature innovative circuitry that allows safe oper ation into any load W hen an amplifier sees a load that overstresses the output stage the Instantaneous Gain Modulation IGM circuit adjusts the channel gain to a safe level This method of output stage protection is far superior to the conventional brute force type limit ing found on other amplifiers The IGM circuit is sonically transparent in normal use and unobtrusive when activated Thermal Protection The intern
36. owerSave Maintenance Installation Unpacking Upon unpacking inspect the amplifier If you find any damage notify your supplier immediate ly O nly the consignee may institute a claim with the carrier for damage incurred during ship ping Be sure to save the carton and all packing materials Should you ever need to ship the unit for any reason use only the original factory packing If the shipping carton is unavailable contact Crest to obtain a replacement Mounting Crest Audio CKi amplifiers are configured to a standard set up at the factory They are func tional and ready to use out of the box All controls and input output connections are clearly labeled Units are shipped standard with a blank panel in the module bay To set the amplifier up for basic usage 1 Mount the amplifier in a rack remembering to allow for adequate access and cool ing space See Cooling Requirements below for more information 2 Make input connections via the rear panel Phoenix connector inputs M ake the con nections to both inputs Ch A and Ch B for stereo operation or connect to Ch A only for parallel or bridged mono configuration See Chapter 4 Modes for more information 3 Connect speakers to the output barrier strip Be sure to make the correct output connections for stereo parallel or bridged mono configuration See Chapter 5 O peration for more information 4 Make power connections allowing for proper current draw Se
37. own free using compressed air of any foreign matter that may have built up inside W hen used in an environment where residue from smoke fog machines is regularly present the amplifier s should be periodically checked by authorized C rest service personnel for build up of that residue The filter in the front panel air intake grille should be periodically cleaned Should the filter become permanently clogged or damaged a replacement should be obtained through your Crest representative Users will not need to make any adjustments to the amplifier during its lifetime O ther than installing or replacing a N exSys module there are no user serviceable parts or adjustments that require opening the unit Always turn off and disconnect the amplifier from the mains voltage before making audio connections If possible as an extra pre caution have the attenu ators turned down dur ing power up Controls and connectors Legend of panel symbols Air flow SE Features Overview Front Panel Side Panel Rear Panel Features Overview This chapter identifies the switches indicators connectors and functional com ponents of all CKi amplifiers Keep in mind that this chapter is only as an overview of the amplifiers layout and does not contain all the information nec essary to effectively operate the CKi For more detailed information on the items listed here be sure to read this entire manual Front Pan
38. per signal paths Proper wiring schemes for output connectors Sequential tum on off Additional operation considerations SE Power Input Output STO GOperdion Power Unless otherwise specified when ordered CKi Series amplifiers are shipped from the factory set to one of following voltage options Option 1US domestic Nominal 120Vac 60Hz for rated power output safe operating range 100 132Vac Option 2 Export Nominal 230Vac 50Hz for rated power output safe operating range 200 264Vac Inputs All CKi series amplifiers use 3 Pin Phoenix connectors for attaching input sig nals Each connector is configured from left to right positive negative ground Input Phoenix Connectors In situations where an SH Ch A Ch B UNBALANCED sig nal is fed to the amp e cq it s important to ground the unused input If the ing the gain will drop by 3 dB Outputs Direct Direct speaker outputs are connected to C Ki series amplifiers via the rear panel terminal strips Be sure to properly calculate the total impedance of all speakers connected to a direct output and to not exceed the minimum impedance rating of your CKi amplifier Constant Voltage For CKi v and CKi x models constant voltage distributed lines are connected to via the same rear panel terminal strips Be sure to prop erly calculate the total wattage demand of each constant voltage line
39. s The attenuator knobs can be removed and replaced with plugs that are shipped with the amplifier The procedure for attenuator knob removal is as fol lows 1 W ith a small knife remove the gray key cap of the attenuator knob revealing the inside nut 2 Using needle nose pliers or an appropriately sized nut driver loosen the nut 3 Slide the attenuator knob off the shaft 4 Insert a regular screwdriver in the slotted end of the shaft and adjust attenuation to the desired level 5 Insert the blank plugs into the attenuator holes p 18 A Protect D IGM ACL C Signal ChA ChB dod tot 775v GI SEE x20 IT 126 Thput Gain wud Ch A Knob still attached Ch B Knob replaced with plug 6 6 Ti 10 15 3 715 30 AEA d oo dB oo ZdB ChA Ch B Operation Gain Select Switch The 3 position gain select switch on the rear panel to sets the overall gain of the amplifier The left and right switch positions set the amplifier for constant gain of x20 26 dB or x40 32 dB respectively The center position sets the amplifier for constant sensitivity In this position a OdBu 0 775 VRMS input signal will produce maximum power at the amplifiers output The standard factory setting is for x40 32dB The specifications for a specific C Ki models in Appendix A contain more gain sensitivity information Signal Ground Lift Switch The signal source equipment should share the same
40. s vary considerably in susceptibility to noise induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently 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 11 2 102 1 105 1 2 110 1 4 or less 115 According to O SHA 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 CREST AUDIO SAVE THESE INSTRUCTIONS CREST AUDIO How To UseThis Manual p 2 Introduction Conventions InStallatioTi z mc ccce d p 3 Unpacking Mounting Cooling Requirements Circuit Size Requirements PowerSave Maintenance Features O verview p 7 Front Panel Side Panel Rear Panel tee EE p 13 Stereo Parallel Brid
41. speaker 1 X xfrmr 2 P speaker 2 and V is the distributed line voltage So for a 70 7 volt line Z 70 7 2 P Z 5000 P Distributed Line KI p 36 50 W Common 4 Common For example if the total power demanded by the speakers is 200 watts then V2 P 25 The compensation factor for transformer insertion loss is X power drawn from distributed line power delivered to speaker 10 Insertion loss in dB 10 Therefore a speaker transformer with an insertion loss of 1 dB tapped at 4 watts will actually demand 1 26 times 4 watts or about 5 watts CKV Series amplifiers are specifically designed for use with dis tributed or constant voltage systems Each CKV Series model can drive two distributed lines one per channel of the type for which they are configured any number of tapped loudspeakers can be placed on a line as long as the total demanded power including insertion loss es does not exceed the rated power of the model chosen If the impedance of a distributed line overly stresses the amplifier output stage the amplifier s IGM protection circuits engage reducing gain in order to protect the amplifier CREST AUDIO Hex 001 002 004 005 007 008 00 00B 00D 00 010 011 012 013 014 016 017 019 01A 01B 01C 01D 01E DIE 020 021 022 023 024 025 026 027 028 029 02A 02B 02C 02D 02 02 091 032 034 035 037 038 03A 03B 0
42. thernet amplifier Under this setting a connected DHCP server will dymani cally assign an I P Address to the amplifier SettingAmplifier ID Use the Function button to choose Amp ID EachAmp ID is composed of two two digit hexadecimal values see Appendix C for more infor mation on Hex N umbering The upper two digits the H igh Value and the lower two digits the Low Value can be independently adjusted For this function the Select button toggles between these two values Select a value for adjustment and press Edit The selected portion of the ID will flash and the increment and decrement keys can now be used to adjust the value O LP Address Amp ID O Gain O Temperature OAC Voltage Edit Select Function An amplifier s Lk Address can be used to designate an amp in a net work however Amp ID is more useful for designation particularly when DHCP is being used SE NexSys Modules Amplifier IDs can remain fixed even if the LP Address changes making the amplifiers settings and operating conditions easier to track Additionally creative use of the High and Low Values in the Amp ID can provide even more information about an amplifier Since the two val ues can be adjusted independently the H igh Value could be used to des ignate a group of amplifiers while the Low Value would identify specific amplifiers in that group Adjusting Gain Use the Function button to choose Gain In this mode the Select button c
43. this button changes between the parameter values for ChannelA and Channel B This button is also used to select parameters within a given function Function Button This button scrolls through the functions that can be controlled from the module panel including I P Address Amp ID Gain Temperature AC Line Voltage As each is selected the corresponding LED wil light and the appropriate function parameter will appear in the display Increment Decrement Buttons W hen the module is in edit mode and the value in the display is flash ing the increment and decrement buttons will adjust the value Function LEDs Each of the main functions has a corresponding LED W hen a func tion is selected this LED will light to identify the selection Some sec ondary functions do not have an associated LED so no LED will light when these functions are selected SE Not all function para meters can be adjust E ed e g AC Line Voltage Temperature etc as they are output values only p 27 NexSys Modules O L P Address RTE Amp ID O Gain A B O Temperature Fault 24 OAC Voltage Mute Fault LEDs Each channel has a fault LED on the module panel If one or more of a channel faults is triggered this LED will illuminate A fault code will also appear in the display Mute LEDs Each channel has a mute LED that will illuminate if the channel is muted through the control software OptionW in
44. 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 your outlet consult an electrician for replacement of the obsolete outlet 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 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 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 If this product is to be mounted in an equipment rack rear support should be provided Exposure to extremely high noise levels may cause a permanent hearing loss Individual
45. you expect from Crest Audio T hey are ruggedly built from high quality components intelligently laid out and possess comprehensive protection features After sale support is considered paramount at Crest Audio For any assistance in the set up or operation of this product please call C rest Audios Customer Service department or your local Crest Audio representative Should you have any problems at all or suggestions that may help us improve our products or service please contact us W e encourage your partici pation in Crest s future FORYOUR SAFETY READTHE IMPORTANT PRECAUTIONS SECTION AS WELLASTHE INPUT OUTPUT AND POWER CONNECTION SECTIONS OF THIS MANUAL Conventions Warnings Procedures not to attempt A Issues or hazards to keep in mind when operating the equipment Indicators W hat to look for on X9 the equipment display x Alerts indicators or prompts that may appear Tips Preferred methods Si 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 N ote supplementary feature information Y What to do with the shipping carton Y Proper rack mounting technique Y Keeping the amplifier cooled Y Supplying proper power Y Saving power Routine maintenance practices OS ALI Installation Unpacking Mounting Cooling Requirements Circuit Size Requirements P
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