Crown 1 Musical Instrument Amplifier User Manual
Contents
1. E106377 L Applies only to 120 VAC North American PB 1 PB 2 and PB 3 units Models Power Base 1 2 amp 3 O 1996 by Crown International Inc P O Box 1000 Elkhart Indiana 46515 1000 U S A Telephone 219 294 8000 Power Tech amplifiers are produced by the Professional Audio Division of Crown International Inc Trademark Notice Power Base 3 is a trademark and Power Base 1 Power Base 29 Crown IOC and ODEP are registered trademarks of Crown International Inc Other trademarks are the property of their respective owners LL 32521C Applies only to 120 VAC North American PB 1 and PB 2 units 101229 1 12 96 THREE YEAR FULL WARRANTY WORLDWIDE NORTH AMERICA SUMMARY OF WARRANTY The Crown Audio Division of Crown International Inc 1718 West Mishawaka Road Elkhart Indiana 46517 4095 U S A warrants to you the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown product for a period of three 3 years from the date of purchase by the original purchaser the warranty period that the new Crown product is free of defects in materials and workmanship and we further warrant the new Crown product regardless of the reason for failure except as excluded in this Crown Warranty 1 Note If your unit bears the name Amcron please substitute it for the name Crown in2. The information furnished in this manual does not include all of the details of design production or variations of the equipment Nor does it cover every possible situation which may arise during installation operation or mainte nance If you need special assistance beyond the scope of this manual please contact our Technical Support Group Crown Audio Division Technical Support Group Plant 2 SW 1718 W Mishawaka Rd Elkhart Indiana 46517 U S A Phone 800 342 6939 North America Puerto Rico and Virgin Islands or 219 294 8200 Fax 219 294 8301 Fax Back 800 294 4094 North America only or 219 293 9200 Internet http www crownintl com IMPORTANT THE POWER BASE 3 REQUIRES CLASS 1 OUTPUT WIRING THE POWER BASE 1 AND 2 REQUIRE CLASS 2 OUTPUT WIRING CAUTION AVIS RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC ELECTRIQUE N OUVREZ PAS TO PREVENT ELECTRIC SHOCK DO A PREVENIR LE CHOC ELECTRIQUE NOT REMOVE TOP OR BOTTOM N ENLEVEZ PAS LES COUVERCLES IL COVERS NO USER SERVICEABLE NY A PAS DES PARTIES SERVICEABLE PARTS INSIDE REFER SERVICING TO L INT RIEUR TOUS REPARATIONS QUALIFIED SERVICE PERSONNEL DOIT ETRE FAIRE PAR PERSONNEL DISCONNECT POWER CORD BE QUALIFIE SEULMENT DEBRANCHER FORE REMOVING BACK PANEL LA BORNE AVANT D ENLEVER LA COVER TO ACCESS GAIN SWITCH COVERTURE EN ARRIERE Magnetic Field CAUTION Do not locate sensitive high gain equipment such as preamplifiers
3. ohms watts FUSE amps iS PEAK MUSIC POWER LOUDSPEAKER RATING LOUDSPEAKER IMPEDANCE n 4 L 15 Fig 2 5 Loudspeaker Fuse Nomograph 2 5 Required AC Mains All Power Base amplifiers are shipped with an appro priate line cord and plug When possible use a power receptacle on a dedicated circuit and always make sure it will provide the right voltage and sufficient cur rent We do not recommend operating your amplifier with voltages greater than 10 above or below the unit s rated voltage For example if your amplifier is rated for 120 VAC the line voltage should not exceed 132 VAC Power Base Series Power Amplifiers 3 Operation 3 1 Precautions Although your amplifieris protected from external faults the following safety precautions are recommended 1 There are important differences among the Stereo Bridge Mono and Parallel Mono operating modes Please refer to Sections 2 for additional information 2 WARNING Do not change the position of the stereo mono switch unless the amplifier is first turned off 3 CAUTION In Parallel Mono mode a jumper is used to connect the red binding post outputs Be sure to remove this jumper for Bridge Mono or Stereo mode or high distortion and excessive heating will occur Also make sure the stereo mono switch is set to the proper position 4 Use care when making connections selecting sig nal sources and controlling the outpu
4. fully counterclockwise and turn off the amplifier 2 Set the back panel stereo mono switch to Stereo 3 If present remove the Parallel Mono jumper 4 Connect the input and output cables as shown in the first example in Figure 2 1 5 Turn on the amplifier and adjust the level for each chan nel using the back panel level controls CAUTION Never parallel the two outputs by di rectly tying them together and never parallel them with the output of another amplifier 2 2 Mono Your amplifiers mono modes provide double the power of Stereo mode in a single channel In Bridge Mono mode the outputs are wired in series for twice the output voltage In Parallel Mono mode the outputs are paralleled for twice the current capacity Bridge Mono mode is provided for loads with an im pedance greater than 4 ohms Parallel Mono mode should be used with loads of 4 ohms or less BRIDGE MONO 1 Turn down the level controls fully counterclockwise and turn off the amplifier 2 Set the back panel stereo mono switch to Bridge Mono 3 If present remove the Parallel Mono jumper 4 Connectthe input and output cables as shown in the sec ond example in Figure 2 1 Only usethe channel 1 input 5 Make sure the load is balanced neither side shorted to ground and do not use the black binding posts 6 Turn on the amplifier and adjust the level Only use the channel 1 level control PARALLEL MONO 1 Turn down the le
5. GND SLEEVE BALANCED INPUT WIRING TIP Li Yr id INPUT FCLU T INPUT GAIN AFFECTS PHONE INPUTS ONLY MONO GND SLEEVE Fig 2 4 Input Sensitivity Switch 2 4 Additional Load Protection To protect against excessive power a fuse can be added in series with each loudspeaker cable A single fuse can protect the entire system or one can be used for each driver High frequency drivers tweeters are usually more sensitive to large voltage peaks while low frequency drivers woofers are typically most sen sitive to the heat from average RMS output power To protect your tweeters we recommend that you use a high speed instrument fuse like the Littlefuse 361000 series To protect your woofers we recommend using a slow blow fuse that more closely represents the thermal response of your woofer Use Figure 2 5 to find the cor rect value for either type of fuse Page 10 Power Base Series Power Amplifiers Example A Find the peak music power of your loudspeaker such as 75 watts B Find the loudspeaker impedance 8 ohms C Draw a line between points A and B The line inter sects the middle scale at the correct fuse value 1 5 amps 2 3000 254 2000 1500 1000 8 3 8 Example Impedance 8 ohms Peak Power 75 W 100 Answer Fusez1 5A g Lit EHI 3 Typically 4 times the continuous average power
6. Power Notes All maximum power specifications are based on 0 1 regulated AC mains and an ambient room temperature of 70 F 21 C A 100V 50Hz model was used because of its higher current demand Although it is an unusual condition your amplifier can function well with AC mains voltages up to 10 over the specified line voltage With overvoltage conditions your amplifier may be capable of delivering instantaneous power levels up to 20 greater than the specifications in the matrix 1 A single cycle sine wave is presented to the amplifier and monitored for nonlinear distortion The average power during the burst is reported Loudspeakers must be able to withstand this level if they are to be safely used with this amplifier 2 A40 millisecond sine wave burst 10 percent duty cycle is presented to the amplifier and monitored for nonlinear distortion The average power during the burst is reported This power level is a measurement of the amplifier s maximum transient power that can be perceived by the human ear Power Base 1 Maximum Power Watts Single Cycle Tone Burst 40 Millisecond Tone Burst Stereo Mono At less than 0 05 THD 0 05 THD Noise Mode See note 1 See note 2 1 kHz Stereo both channels driven Bridge Mono balanced output eo 5 N a o oO gt e N Parallel Mono Stereo both channels driven Bridge Mono balanced output International
7. Units Parallel Mono Fig 4 4 Power Base 1 Maximum Power Matrix Page 17 EErouwn Page 18 Power Base Series Power Amplifiers Power Base 2 Maximum Power Watts Stereo Mono Mode Stereo both channels driven Single Cycle Tone Burst At less than 0 05 THD See note 1 40 Millisecond Tone Burs 0 05 THD Noise See note 2 50 Hz 1 kHz Bridge Mono balanced output e 2 5 N ce o c gt a N x International Units Parallel Mono Stereo both channels driven Bridge Mono balanced output Parallel Mono Fig 4 5 Power Base 2 Maximum Power Matrix Power Base 3 Maximum Power Watts 120 VAC 60 Hz Units International Units Stereo Mono Mode Stereo both channels driven Single Cycle Tone Burst Atless than 0 05 THD See note 1 40 Millisecond Tone Burst 0 05 THD Noise See note 2 50 Hz 1 kHz 50 Hz 1 kHz Bridge Mono balanced output pe Parallel Mono Stereo both channels driven Bridge Mono balanced output E Parallel Mono m ojo o Fs a mn o jojo Fig 4 6 Power Base 3 Maximum Power Matrix Power Base Series Power Amplifiers 5 Accessories There are two accessories available at the time of this printing the MT XLR and the MT BB Important The MT XLR and MT BB must be
8. and send it along with your proof of purchase and the defective unit to the Crown factory For warranty service we will pay for ground shipping both ways in the United States after receiving copies of the shipping receipts Shipments should be sent UPS ground If the unit is under warranty you may send it C O D for the cost of freight via UPS ground The fac Page 20 Power Base Series Power Amplifiers tory will return it via UPS ground Please contact us if other arrangements are required Factory Service Shipping Instructions Always use the original factory pack to transport the unit 1 When sending a Crown product to the factory for service be sure to fill out the service information form that follows and enclose it inside your units shipping pack Do not send the service informa tion form separately 2 To ensure the safe transportation of your unit to the factory ship it in an original factory packing container If you don t have one call or write Crown s Parts Department With the exception of polyurethane or wooden crates any other pack ing material will not be sufficient to withstand the stress of shipping Do not use loose small size packing materials 3 Do not ship the unit in any kind of cabinet wood or metal Ignoring this warning may result in ex tensive damage to the unit and the cabinet Ac cessories are not needed do not send the instruction manual cables and other hardware If
9. consignee may initiate a claim with the carrier for damage resulting during shipment Even if the unit arrived in perfect condition as most do save all packing materials so you will have them if you ever need to transport the unit NEVER SHIP THE UNIT WITHOUT THE FACTORY PACK 1 2 Features 11 Rugged professional power amplifier built for the road Mounts in a standard 19 inch 48 3 cm rack m Crown s patented grounded bridge circuitry gener ates large voltage swings while avoiding electrical stress on the output stages This results in low distortion and high reliability LJ Front panel power switch with turn on delay for loud speaker protection U Patented Output Device Emulation Protection ODEP9 keeps the amplifier working when others would fail 1 High damping factor provides superior control over low frequency drivers for a clean accurate low end 1 Safe with any load Bridge Mono and Parallel Mono modes offer optimal load matching performance A Complete protection against shorted outputs mis matched loads overheating DC input output and high frequency overload full internal fault protection L1 Balanced phone jack inputs with internal three position sensitivity switch Optional XLR or barrier block input connectors are available with the MT XLRor MT BBac cessories A Ground lift switch is provided to isolate the chassis ground from the phone jack input ground CJ Efficient heat sinks and sel
10. installed at a Crown Factory Service Center or the Crown factory 5 1 MT XLR The MT XLR is an accessory panel that provides two standard 3 pin female XLR input connectors The MT XLR accessory makes it easy to quickly change connections in a system that uses standard XLR con nectors lt can also be used in systems that need to daisy chain an input signal from one amplifier to an MT XLR CH 2 INPUT CH 1 INPUT o e NOT THESE XLR INPUTS ARE CONNECTED IN PARALLEL WITH THE PHONE JACK INPUTS Fig 5 1 The MT XLR Scrown other Because the MT XLR connectors are wired in parallel with the amplifier s built in phone jack connec tors an input signal fed to either input can be fed to another amplifier from the unused connector for that channel 5 2 MT BB The MT BB is an accessory panel that provides barrier strip input connectors An MT BB accessory might be desirable in applications requiring bare wire connec tions It can also be used to daisy chain an input signal from one amplifier to another just like the MT XLR CH 2 INPUT CH 1 INPUT zt ur p nao Fig 5 2 The MT BB Page 19 S crown 6 Service This unit has very sophisticated circuitry which should only be serviced by a fully trained technician This is one reason why each unit bears the following label CAUTION To prevent electric shock do not re move covers No user serviceable parts inside Re fer servicing to a qualified technician 6 1 Wo
11. this warranty ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period It does not cover any product which has been damaged because of any intentional misuse accident negligence orloss whichis covered under any of yourinsurance contracts This Crown Warranty also does not extend to the new Crown productif the serial number has been defaced altered or removed WHAT THE WARRANTOR WILL DO We will remedy any defect regardless of the reason for failure except as excluded by repair replacement or refund We may not elect refund unless you agree or unless we are unable to provide replacement and repair is not practical or cannot be timely made If a refund is elected then you must make the defective or malfunctioning product available to us free and clear ofall liens or other encumbrances The refund will be equal to the actual purchase price notincluding interest insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase Warranty work can only be performed at our authorized service centers We will remedy the defect and ship the product from the service center within a reasonable time after receipt of the defective product at our authorized service center All expenses in remedying the defect including surface shipping costs to the nearest authorized service center
12. you have any questions please call or write the Crown Technical Support Group Crown Audio Division Technical Support Factory Service Plant 2 SW 1718 W Mishawaka Rd Elkhart Indiana 46517 U S A Telephone 219 294 8200 800 342 6939 North America Puerto Rico and Virgin Islands only Facsimile 219 294 8301 Technical Support 219 294 8124 Factory Service Fax Back 219 293 9200 800 294 4094 North America only Internet http www crownintl com Detach and send with unit Crown Factory Service Information Shipping Address Crown International Inc Factory Service Plant 2 SW 1718 W Mishawaka Rd Elkhart IN 46517 Phone 1 800 342 6939 or 1 219 294 8200 Fax 1 219 294 8124 Owner s Name Shipping Address Phone Number Fax Number Model Serial Number Purchase Date NATURE OF PROBLEM Be sure to describe the conditions that existed when the problem occurred and what attempts were made to correct it Other equipment in your system If warranty has expired payment will be L1 Cash Check VISA MasterCard L1 C O D Card Number Exp Date Signature ENCLOSE THIS PORTION WITH THE UNIT DO NOT MAIL SEPARATELY
13. 0 1 at 20 kHz Intermodulation Distortion IMD 60 Hz and 7 kHz 4 1 Less than 0 05 from less than 158 milliwatts to full bandwidth power Damping Factor Greater than 1 000 from 10 Hz to 400 Hz Crosstalk Power Base 1 Greater than 75 dB below full band width power from 50 Hz to 2 kHz rising linearly to greater than 60 dB at 20 kHz Power Base 2 Greater than 90 dB below full band width power from 50 Hz to 2 kHz rising linearly to greater than 66 dB at 20 kHz Power Base 3 Greater than 90 dB below full band width power from 50 Hz to 4 KHz rising linearly to greater than 70 dB at 20 kHz Common Mode Rejection CMR Better than 70 dB below rated full bandwidth power from 20 Hz to 1 kHz falling linearly to better than 50 dB at 20 kHz Controlled Slew Rate Greater than 13 volts ms Voltage Gain 20 1 3 or 26 dB 0 25 dB at the maxi mum level setting Input Sensitivity switch set to its 26 dB position Power Base 1 51 1 x1296 or 34 3 dB 1 dB at 0 775 volt sensitivity 28 1 12 or 29 1 dB 1 dB at 1 4 volt sensitivity ecrouwn Power Base 2 64 1 12 or 36 2 dB 1 dB at 0 775 volt sensitivity 35 1 12 or 31 0 dB 1 dB at 1 4 volt sensitivity Power Base 3 83 1 12 or 38 4 dB 1 dB at 0 775 volt sensitivity 46 1 12 or 33 3 dB 1 dB at 1 4 volt sensitivity Power Output Power The following specifications are guaran teed minimums for standard 1 kHz power For more infor mation see the po
14. 21 C A 100V 50Hz model was used because of its higher current demand The standard EIA power measurement RS 490 is not identified here because it is identical to the FTC Continuous Average Power specification 1 A1kHz sine wave is presented to the amplifier and the output monitored for nonlinear distortion The level is increased until the THD reaches 0 1 At this level the average power per channel is reported 2 Asine wave is presented to the amplifier over the range from 20 Hz to 20 kHz and the output monitored for nonlinear distortion The level at each frequency is increased until the THD reaches 0 1 At this level the average power per channel is reported 3 A1kHz sine wave is presented to the amplifier and the output monitored for nonlinear distortion The level is increased until the THD reaches 0 05 At this level the average power per channel is reported 4 Continuous power in the context of Federal Trade Commission testing is understood to be a minimum of five minutes of operation Harmonic distortion is measured as the RMS sum total and given as a percentage of the fundamental output voltage This applies for all wattages greater than 0 25 watts Power Base 1 Minimum Guaranteed Power Watts Maximum Average FTC Continuous Average Stereo Mono 0 1 THD N 0 1 THD N 0 05 THD N 0 1 THD Noise Mode See note 1 See note2 See note 3 See note 4 1 kHz 20Hz 20kHz 1 kHz 1 kHz 20Hz 20kHz Stereo both chan
15. 9 cm height and 16 inch 40 6 cm depth behind the mounting surface Approximate Weight Center of gravity is 6 inches 15 2 cm behind front mounting surface 120 VAC 60 Hz Units Power Base 1 30 pounds 13 6 kg net 34 pounds 15 4 kg shipping weight Power Base 2 34 pounds 15 4 kg net 38 pounds 17 2 kg shipping weight Power Base 3 36 pounds 16 3 kg net 40 pounds 18 2 kg shipping weight Power Base Series Power Amplifiers crown Crown specifications are guaranteed for three years In an effort to provide you with as much information as possible about the high power producing capabilities of your amplifier we have created the following power matrices Minimum Power Specifications Crown s minimum power specifications represent the absolute smallest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions Some spaces in each matrix may be left blank because the same guarantee is not provided for those conditions however your amplifier will perform well under all conditions listed in each matrix When measuring power 0 1 THD appears to be the industry standard for distortion Two of the maximum average power specifications shown in each minimum power matrix are measured at 0 1 THD so you can easily compare Crown specifications to those of other manu facturers But this high level of distortion actually allows for some clipping which is undesirable Becau
16. MIEBBZ S it Be ok Ne 19 Page 5 Power Base Series Power Amplifiers ecrouwn Power Power Indicator Switch Reset Switch Power Base 3 Only Access Cover Power Cord Removable grille and dust filter 5 Way Binding Post Output Connectors CAUTION THIS COVER IS NECESSARY FOR EFFICIENT COOLING OF THE AMPLIFIER REMOVE ONLY TO ACCESS GAIN SWITCH Ch 2 Level Stereo Mono Switch Ya Inch Control Phone Switch Input Ch 2 Ground Ch1 Ch1 Lift V4Inch Level Phone Control Input Fig 1 1 Power Base Front and Back Panels 1 Welcome Congratulations on choosing a Power Base amplifier Power Base amplifiers are compact professional ste reo power amplifiers engineered to meet the most de manding sound reinforcement needs They compare very favorably to more expensive amplifiers providing uncolored sound and signal to noise ratios commonly associated with recording studios This manual will help you successfully install and use your amplifier we strongly recommend you read all instructions warnings and cautions If you plan to oper ate in one of the two mono modes be sure to read Sec tion 2 2 Also for your protection please save your bill of sale as it is your official proof of purchase 1 1 Unpacking Please unpack and inspect your new amplifier for any damage that may have occurred during transit If dam age is found notify the transportation company imme diately Only you the
17. al Units Stereo both channels driven Bridge Mono balanced output Parallel Mono Fig 4 3 Power Base 3 Minimum Power Matrix Power Base Series Power Amplifiers crown Maximum Power Specifications Crown s maximum power specifications represent the largest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions These specifications can be used to prevent loudspeaker and hearing damage The maximum power matrices include specifications for single cycle and 40 millisecond burst sine waves Burst signals act like large transient peaks that are present in common source signals Loudspeakers can respond to a single cycle burst so the single cycle burst specifications should be used to help you protect your loudspeakers In contrast a 40 millisecond burst represents the typical response time of the human ear Your ear will not respond to the entire dynamic change of a burst that lasts less than 40 milliseconds The specifications are provided at 0 05 THD because this represents a low distortion condition To help you operate your amplifier within these tolerances Crown s premium amplifiers include an input output comparator that shows when the amplifier has exceeded 0 05 THD Operating the amplifier at levels higher than 0 05 THD can result in output power levels that are higher than those listed in the maximum power matrices Maximum
18. ck panel Circuit Breaker Reset If the problem persists refer the unit to a qualified techni cian Page 12 Power Base Series Power Amplifiers 3 4 Controls The Power switch is th only control located on the front panel All others are located on the rear including the level controls When making any setup or wiring changes don t forget to turn off the amplifier turn down the level controls and disconnect the power cord Be sure to turn down full counterclockwise the channel 2 level control when us ing either mono mode The Parallell Mono Stereo Bridge Mono switch is used to select Stereo Bridge Mono or Parallel Mono operating modes The Input Ground Lift switch isolates the phone jack input grounds from the chassis ground to help prevent ground loops It does not affect any installed input ac cessories The Input Sensitivity Switch located inside the back cover plate sets the amplifier s input sensitiv ity refer to subsection 2 3 for information on changing this switch And the Power Base 3 has a back panel Circuit Breaker Reset button that resets the circuit breaker refer to subsection 3 3 5 CHANNEL 2 LEVEL CONTROL CHANNEL 1 LEVEL CONTROL CH 2 CH 1 5 ij 11 8 4 3 9 3 10 PEE TES y INPUT GROUND LIFT 12 INPUT Le Z INPUT AFFECTS PHONE INPUTS ONLY MONO Fig 3 1 Back Panel Level Controls 3 5 Filter Cleaning A dust filter is provided on the unit s air intake If it be come
19. da ER D et eus 11 3 3 2 Ultrasonic and RF Protection 11 3 3 2 Drive Protection tette bere 11 3 3 4 Transformer Thermal Protection 12 3 3 5 Fuses and Circuit Breakers i n 12 Ou COMUOIS cric ertet e tete p teo e te erts 12 3 5 Filter Cleaning tt Creer re e rta 12 A eere ane aeiae 13 5 ACCOSSO MOS cias 19 Sto MIESXBE ao tt oe ER cto cad 19 TERV EE e A ada Da 19 6 Service Mii an 20 6 1 Worldwide Service ssssssmRR 20 6 2 North American Service cerier 20 6 2 1 Service at a North American Service Center 20 6 2 2 Factory Service aene a a a 20 Page 4 Power Base Series Power Amplifiers crown ILLUSTRATIONS 1 1 Power Base Front and Back Panels inn 7 2 1Three System Connection Methods sss 8 2 2Do NOT Block Air Flow ssseRR RR 9 2 3Power Base Input Wiring ssssssssssm 9 2 AInput Sensitivity Switch e ra i a i 10 2 5Loudspeaker Fuse Nomograph cciciocococccccccconnnnnccccnannnnnnos 10 3 1Back Panel Level Controls ss 12 4 1Power Base 1 Minimum Power Matrix o an 15 4 2Power Base 2 Minimum Power Matrix oaeaeei 16 4 3Power Base 3 Minimum Power Matrix i e 16 4 4Power Base 1 Maximum Power Matrix sees 17 4 5Power Base 2 Maximum Power Matrix sseeeess 18 4 6Power Base 3 Maximum Power Matrix seeeess 18 5t The MTSXERU au see tee omes 19 52The
20. ed two channel Bridge Mono Balanced single channel Channel 1 controls are active Channel 2 controls should be turned down and not used Parallel Mono Unbalanced single channel Channel 1 controls are active Channel 2 controls should be turned down and not used Protection Power Base amplifiers are protected against shorted open or mismatched loads overloaded power supplies excessive temperature chain destruction phenomena input overload and high frequency blowups They also protect loudspeakers from input and output DC as well as providing protection from turn on turn off transients If operating conditions are unreasonable the patented ODEP circuitry proportionally limits the drive level to pro tect the output transistors particularly in the case of el evated temperature A thermal switch imbedded in the transformer protects the power supplies from overload In the rare event that a transformer overheats the ther mal switch removes power waits until the unit has cooled to a safe temperature and then resets itself Turn On Four second delay with no dangerous tran sients Contact us if you need to change the delay Construction Durable black finish on steel chassis with special flow through ventilation from front to side panels Cooling Internal heat sinks with forced air cooling for rapid uniform heat dissipation Dimensions Standard 19 inch 48 3 cm rack mount width EIA RS 310 B 3 5 inch 8
21. emperature It is very unlikely that your Power Base amplifier will ever activate transformer thermal protection as long as it is operated within rated conditions Your amplifier is designed to continue operating under conditions where other amplifiers would fail But even when you exceed the limits of a Power Base amplifier it still pro tects itsel and your investment from damage 3 3 5 Fuses and Circuit Breakers All 120 VAC 60 Hz units and all Power Base 3 units have a fuse that protects the low voltage power supply and cooling fan The Power Base 1 and Power Base 2 high voltage power supplies are protected by fuses while the Power Base 3 high voltage power supplies are protected by a circuit breaker With rated loads and output levels these fuses or the circuit breaker should only shut down the amplifier in the incredibly rare instance of a catastrophic amplifier failure The ODEP protection system keeps the amplifier opera tional under most other severe conditions The fuses or breaker can also shut down the amplifier in situa tions where extremely low impedance loads and high output levels result in excessive current draw A Power Base amplifier will not blow its fuses or trip its breaker unless something is wrong In the rare event that an internal fuse blows please refer the unit to a qualified technician If the breaker in a Power Base 3 trips try to identify and correct the problem before re setting it with the ba
22. f contained forced air cool ing system dissipate heat quickly and evenly for extra amplifier protection and greater power output 1 Three year No Fault full warranty and guaranteed specifications protect your investment Page 7 Cf OUUJ Power Base Series Power Amplifiers CHANNEL 2 CHANNEL 1 CHANNEL 2 STEREO MODE CHANNEL 1 POWER BASE AMPLIFIER CH 2 GROUND CH 1 LEVEL LIFT LEVEL CONTROL SWITCH CONTROL STEREO PARALLEL e BRIDGE MONO MONO CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH ONLY USE THE CHANNEL 1 INPUT CHANNEL 2 IS NOT USED IN THIS MODE DO NOT LOUDSPEAKER USE BLACK TERMINALS POWER BASE AMPLIFIER TURN CHANNEL 2 OFF FULLY CCW IN THIS MODE STEREO PARALLEL BRIDGE MONO MONO CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH ONLY USE THE CHANNEL 1 INPUT ADD A 14 GAUGE OR LARGER JUMPER BETWEEN THE RED CHANNEL 1 CHANNEL 2 IS AND CHANNEL 2 LOUDSPEAKER MIXER NOT USED IN BINDING POSTS THIS MODE PARALLEL MONO MODE POWER BASE AMPLIFIER STEREO PARALLEL BRIDGE MONO MONO CAUTION TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH Fig 2 1 Three System Connection Methods Page 8 Power Base Series Power Amplifiers 2 Installation Always remove powe
23. gent circuitry was then designed to simu late the instantaneous conditions of the output transis tors Its name describes what it does Output Device Emulation Protection or ODEP In simple terms ODEP compares transistor conditions to their known SOA If more power will be asked of them than they can deliver under the existing conditions ODEP limits the drive until conditions fall within the SOA Limiting is propor tional and kept to an absolute minimum only what is required to prevent output transistor damage Under normal conditions no limiting is required and ODEP is transparent to the audio signal ODEP makes possible a quantum leap in output effi ciency and reliability with ODEP the show goes on 3 3 2 Ultrasonic and Radio Frequency Protection An amplifier s slew rate only needs to be large enough to deliver the maximum voltage at the highest required frequency Higher slew rates actually allow undesirable ultrasonic and radio frequencies to be reproduced By design Power Base amplifiers have a controlled slew rate to limit the highest frequencies that they reproduce Limiting occurs well above 20 kHz so there is no au dible effect on performance This approach protects the amplifier from radio frequencies and can even pro tect some sensitive loads including some tweeters 3 3 3 Drive Protection The drive protection system temporarily removes output drive to protect the amplifier and its loads Drive protec tionca
24. iate AC line cord and plug are provided 120 VAC 60 Hz units have a standard 3 wire 15 amp grounded connector NEMA 5 15P Controls Power A front panel rocker switch used to turn the amplifier on and off Level A back panel rotary potentiometer for each chan nel used to control the output level Stereo Mono A three position back panel switch used to select Stereo Bridge Mono or Parallel Mono mode Sensitivity A three position switch inside the back cover plate used to select the input sensitivity for both channels 0 775 volts or 1 4 volts for standard 1 kHz power or 26 dB voltage gain see Section 2 3 Input Ground Lift A two position back panel switch used to isolate the phone jack and chassis grounds Reset Power Base 3 only A back panel push but ton used to reset the circuit breaker that protects the power supplies Indicators Power This amber indicator shows the on off status of the low voltage power supply Input Output Input Connector Balanced 4 inch phone jacks See Section 5 for XLR and barrier block accessories Input Impedance Nominally 20 K ohms balanced 10 K ohms unbalanced OutputConnector Twosets ofcolor coded5 way bbinding posts for banana plugs spade lugs or bare wire Output Impedance Less than 10 milliohms in series with less than 2 microhenries DC Output Offset Less than 10 millivolts Page 14 Power Base Series Power Amplifiers Output Signal Stereo Unbalanc
25. n be activated in two situations First if dangerous subsonic frequencies or direct current DC is detected in the amplifier s output the unit will activate its DC low frequency protection circuitry which puts the amplifier in drive protection mode This protects the loads and pre vents oscillations The unit resumes normal operation as soon as the amplifier no longer detects dangerous out put Although it is extremely unlikely that you will ever activate the amplifiers DC low frequency protection system improper source materials like subsonic square waves or input overloads that excessively clip the input signal can activate this system The amplifier s fault protection system will put the am plifier in drive protection mode in rare situations where heavy common mode current is detected in the output Page 11 S crown The unit should never output heavy common mode cur rent unless its circuitry is damaged Activating drive protection helps prevent further damage 3 3 4 Transformer Thermal Protection All Power Base amplifiers have transformer thermal protection This protection circuitry is activated in un usual situations where the unit s transformer tempera ture rises to unsafe levels Under these abnormal conditions the unit removes power to the high voltage transformer The fan will continue to run in all units ex cept those with 220 240 VAC transformers The ampli fier will return to normal after it cools to a safe t
26. nels driven Bridge Mono balanced output eo e 5 N a o oO gt e N Er Parallel Mono Stereo both channels driven Bridge Mono balanced output ay Bl Mm QD oj o AIIAJN i ojojoj a International Units Parallel Mono Fig 4 1 Power Base 1 Minimum Power Matrix Page 15 EErouwn Page 16 Power Base Series Power Amplifiers Power Base 2 Minimum Guaranteed Power Watts N 2 e 5 N a o oO gt e N e Stereo Mono Mode Stereo both channels driven Maximum Average 0 1 THD N 0 1 THD N 0 05 THD N See note 1 See note 2 See note 3 FTC Continuous Average 0 1 THD Noise See note 4 1 kHz 20Hz 20kHz 1 kHz 20Hz 20kHz Bridge Mono balanced output Parallel Mono International Units Stereo both channels driven Bridge Mono balanced output Parallel Mono Fig 4 2 Power Base 2 Minimum Power Matrix Power Base 3 Minimum Guaranteed Power Watts 120 VAC 60 Hz Units Stereo Mono Mode Stereo both channels driven Maximum Average 0 1 THD N 0 1 THD N 0 05 THD N See note 1 Seenote2 See note 3 FTC Continuous Average 0 1 THD Noise See note 4 1 kHz 20Hz 20kHz 1 kHz 20Hz 20kHz Bridge Mono balanced output Parallel Mono Internation
27. or tape decks directly above or below the unit Because this amplifier has a high power density it has a strong WAR N N G magnetic field which can induce hum into unshielded devices that are located nearby The field is stron gest just above and below the unit TO REDUCE THE RISK OF ELECTRIC If an equipment rack is used we recommend locat SHOCK DO NOT EXPOSE THIS ing the amplifier s in the bottom of the rack and the EQUIPMENT TO RAIN OR MOISTURE preamplifier or other sensitive equipment at the top The lightning bolt triangle is used to alert the user to the risk of electric shock The exclamation point CS triangle is used to alert the user to important operating Printed on or maintenance instructions recycled paper C ro uJ n Power Base Series Power Amplifiers CONTENTS 1 Welcome ii icisc ainda cana dn nre mad Va canada dina conc 7 Wel Unpacking e tt 7 T2 Features ote tere iere ter en Ee ids 7 2 Installation cace ec ccewcces ceederccenadevdagesenscacsusecwucesccuustwesordeewseesss 9 PAS 0 s shite ae ittis 9 Di MONO tr daa adria dl 9 2 3 Input Sensitivity Adjustment sssssssssss 10 2 4 Additional Load Protection oooccccccocccccnnoncnnncnnnnos 10 2 5 Required AC Mains e 10 3 Operation cinc 11 S A Precautions x obe BE tse IN es de ta 11 3 2 Power IfidliGalor eoe eet Ee ene 11 3 3 Protecti n SySIerTis s dut ederet e des 11 331 ODE A i ds
28. r are not satisfactory notify us or our authorized service center immediately DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN PRODUCT THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATIONS OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU WARRANTY ALTERATIONS No person has the authority to enlarge amend or modify this Crown Warranty This Crown Warranty is not extended by the length of time which you are deprived of the use of the new Crown product Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured LEGAL REMEDIES OF PURCHASER THIS CROWN WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE No action to enforce this Crown Warranty shall be commenced later than ninety 90 days after expiration of the warranty period THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS Telephone 219 294 8200 Facsimile 219 294 8301 9 90
29. r from the unit and turn the level controls off fully counterclockwise when making or breaking connections This reduces the chance of blasts that can cause loudspeaker damage The guidelines below are provided to help you quickly get your amplifier installed and ready to go Be sure to follow the instructions in Sections 2 1 and 2 2 for the selected mode of operation Additional information on input sensitivity load protection and required AC mains is provided in Sections 2 3 2 4 and 2 5 1 Install the amplifier in a standard 19 inch 48 3 cm rack or place it on a stable surface The mounting dimensions are 19 inches 48 3 cm wide 3 5 inches 8 9 cm tall and 16 inches 40 6 cm deep behind the mounting sur face IMPORTANT Allow for adequate ventilation IMPORTANT Be sure the back of the amplifier is supported 16i P AMPLIFIER TOP VIEW RACK CABINET t AIR FLOW Fig 2 2 Do NOT Block Air Flow 2 Use high quality loudspeaker cables to connect the load to the amplifier s outputs Do not use shielded cable 3 Use shielded cables to connect audio sources to the amplifier inputs Either balanced or unbalanced wiring can be used as shown below XLR connectors are avail able with the MT XLR accessory See Section 5 BALANCED UNBALANCED FROM PREAMPLIFIER SHIELD SHIELD Fig 2 3 Power Base Input Wiring Scrown 2 1 Stereo 1 Turn down the level controls
30. ranty shall be commenced later than ninety 90 days after expiration of the warranty period THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS Telephone 219 294 8200 Facsimile 219 294 8301 SUMMARY OF WARRANTY The Crown Audio Division of Crown International Inc 1718 West Mishawaka Road Elkhart Indiana 46517 4095 U S A warrants to you the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER ofeach NEW Crown product for a period of three 3 years from the date of purchase by the original purchaser the warranty period that the new Crown productis free of defects in materials and workmanship We further warrant the new Crown product regardless of the reason for failure except as excluded in this Warranty ITEMS EXCLUDED FROM THIS CROWN WARRANTY This Crown Warranty is in effect only for failure of a new Crown product which occurred within the Warranty Period It does not cover any product which has been damaged because of any intentional misuse accident negligence orloss which is covered under any of your insurance contracts This Crown Warranty also does not extend to the new Crown product if the serial number has been defaced altered or removed WHAT THE WARRANTOR WILL DO We will remedy any defect regardless of the reason for failure except as excluded by repair replacement or refund We may notelect refund unless you agree or unless we are unable to provide replacement and
31. repair is not practical orcannotbe timely made If a refund is elected then you must make the defective or malfunctioning product available to us free and clear of all liens or other encumbrances The refund will be equal to the actual purchase price not including interest insurance closing costs and other finance charges less a reasonable depreciation on the product from the date of original purchase Warranty work can only be performed at our authorized service centers or at the factory We will remedy the defect and ship the product from the service center or our factory within a reasonable time after receipt of the defective product at our authorized service center or our factory All expenses in remedying the defect including surface shipping costs in the United States will be borne by us You must bear the expense of shipping the product between any foreign country and the port of entry in the United States and all taxes duties and other customs fees for such foreign shipments HOW TO OBTAIN WARRANTY SERVICE You must notify us of your need for warranty service not later than ninety 90 days after expiration of the warranty period All components must be shipped in a factory pack which if needed may be obtained from us free of charge Corrective action will be taken within a reasonable time of the date of receipt of the defective product by us or our authorized service center If the repairs made by us or our authorized service cente
32. rldwide Service Service may be obtained from an authorized service center Contact your local Crown Amcron representa tive or our office for a list of authorized service centers To obtain service simply present the bill of sale as proof of purchase along with the defective unit to an authorized service center They will handle the neces sary paperwork and repair Remember to transport your unit in the original factory pack We will pay the surface shipping costs both ways for warranty service to the authorized service center nearest you after receiving copies of all ship ping receipts You must bear the expense of all taxes duties and customs fees when transporting the unit 6 2 North American Service Service may be obtained in one of two ways from an authorized service center or from the factory You may choose either It is important that you have your copy of the bill of sale as your proof of purchase 6 2 1 Service at a North American Service Center This method usually saves the most time and effort Simply present your bill of sale along with the defective unit to an authorized service center to obtain service They will handle the necessary paperwork and repair Remember to transport the unit in the original factory pack A list of authorized service centers in your area can be obtained from our Technical Support Group 6 2 2 Factory Service To obtain factory service fill out the service informa tion page that follows
33. s clogged the unit will cool less efficiently and may produce lower output levels To clean the filter use a phillips screwdriver to remove the three screws the secure the front grille Use mild dishwashing deter gent and warm water for best cleaning results Be sure the filter is dry before you reinstall it Replacement fil ters may be ordered from the factory Dust filters are not 100 efficient long term this may require internal heat sink cleaning by a qualified tech nician Internal cleaning information is available from our Technical Support Group Power Base Series Power Amplifiers 4 Specifications All specifications apply to units in Stereo mode with 8 ohm loads and an input sensitivity of 26 dB unless otherwise specified Standard 1 kHz Power refers to maximum average power in watts at 1 kHz with 0 1 THD noise Full Bandwidth Power refers to maximum average power in watts from 20 Hz to 20 kHz with 0 1 THD noise 120 VAC 60 Hz Units refers to amplifiers with dedicated trans formers for 120 VAC 60 Hz power mains Performance Frequency Response 0 1 dB from 20 Hz to 20 kHz at 1 watt Phase Response 10 degrees from 10 Hz to 20 kHz at 1 watt Signal to Noise A weighted better than 105 dB be low full bandwidth power Better than 100 dB below full bandwidth power from 20 Hz to 20 kHz Total Harmonic Distortion THD Less than 0 05 at full bandwidth power from 20 Hz to 1 kHz increas ing linearly to
34. se of this a maximum average power spec at 0 05 THD is included in each minimum power matrix which represents non clipped conditions Although most manufacturers do not give you power specifications at 0 05 THD we encourage them to provide these specifications so you will have a more realistic representation of the way amplifiers should be used in the real world without a clipped output signal Many manufacturers publish power specs with a tolerance of 1 dB or worse This means their amplifier can deviate more than 20 in output A 100 watt amplifier would meet their specification if it only produced 79 4 watts Other manufacturers qualify their specs by saying they are typical subject to manufacturing tolerances single channel driven or that they are specified with fuses bypassed Each of these statements effectively removes any performance guarantee In fact some manufacturers use these tactics to generate large power numbers and they don t even print a disclaimer We take a different approach at Crown our amplifiers are guaranteed to meet or exceed their specifications for three years Further because our published specs are set below our in house measurements you can expect every Crown amplifier to exceed its published minimum power specs We believe you should get what you pay for Minimum Power Notes All minimum power specifications are based on 0 1 regulated AC mains and an ambient room temperature of 70 F
35. t level The load you save may be your own 5 Do not short the ground lead of an output cable to the input signal grouna This will form a ground loop and may cause oscillations 6 Operate the amplifier from AC mains of not more than 10 variation above or below the selected line voltage and only at the specified line frequency 7 Never connect the output to a power supply out put battery or power main Such connections may result in electrical shock 8 Tampering with the circuitry by unqualified person nel or making unauthorized circuit changes may be hazardous and invalidates all agency listings Remember Crown is not liable for any damage that re sults from overdriving other system components 3 2 Power Indicator When lit the amber power indicator to the left of the power switch shows that the amplifier has been turned on It is driven only by the low voltage power supply and does not indicate the status of the high voltage supplies 3 3 Protection Systems Power Base amplifiers have extensive protection sys tems including ODEP ultrasonic RF protection drive protection transformer thermal protection and fuses or circuit breakers that protect the power supplies Scrown 3 3 1 ODEP Crown invented ODEP to keep the amplifier working under demanding conditions and to increase output efficiency To do this Crown established a rigorous pro gram to measure each transistor s safe operating area SOA Intelli
36. vel controls fully counterclockwise and turn off the amplifier 2 Set the back panel stereo mono switch to Parallel Mono 3 Install a solid 14 gauge 2 mm or heavier jumper wire across the two red binding post outputs 4 Connectthe input and output cables as shown in the third example in Figure 2 1 Only use the channel 1 input 5 Turn on the amplifier and adjust the level Only use the channel 1 level control CAUTION With Parallel Mono wiring do not switch to Stereo or Bridge Mono mode until the output jumper wire is removed Page 9 EErouNn 2 3 Input Sensitivity Adjustment The input sensitivity switch inside the amplifier is set to 0 775 volts at the factory It can be changed to 1 4 volts or a voltage gain of 26 dB as follows Turn off and unplug the amplifier from the AC source Remove the access cover on the back panel Locate the labeled access hole for the sensitivity switch Set the switch to the desired position Replace the access cover plate ak WN When set to 26 dB gain the Power Base 1 requires a 2 0 volt input the Power Base 29 requires a 2 5 volt in put and the Power Base 3 requires a 3 2 volt input to deliver full output into an 8 ohm load SENSITIVITY SWITCH INSIDE ACCESS HOLE THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY REMOVE COVER PLATE ABOVE TO ACCESS SENSITIVITY SWITCH CH 2 CH 1 O INPUT GROUND LIFT O UNBALANCED INPUT WIRING Ipa TIP
37. wer matrices in Figures 4 1 through 4 6 maximum average power Q 0 1 THD N Power Base 1 Stereo mode both channels driven 240 watts into 4 ohm 200 watts into 8 ohm Bridge Mono mode 455 watts into 8 ohm Parallel Mono mode 455 watts into 2 ohm 400 watts into 4 ohm Power Base 2 S S S 395 watts into 16 ohms v Stereo mode both channels driven 460 watts into 4 ohm 325 watts into 8 ohm Bridge Mono mode 910 watts into 8 ohm S S S 660 watts into 16 ohms Parallel Mono mode 920 watts into 2 ohm 655 watts into 4 ohm Power Base 3 v Stereo mode both channels driven 760 watts into 4 ohm 540 watts into 8 ohm Bridge Mono mode 1525 watts into 8 ohm S S S 1090 watts into 16 ohms Parallel Mono mode 1530 watts into 2 ohm 1080 watts into 4 ohm Load Impedance Safe with al for 4 to 8 ohms in Stereo 8 Mono and 2 to 4 ohms in Paral S S types of loads Rated o 16 ohms in Bridge lel Mono mode Page 13 S crown Required AC Mains Current frequency and voltage requirements are provided on each unit s back panel All models draw 90 watts or less at idle Power Base 1 Draws up to 6 amps of current Power Base 2 Draws up to 10 amps of current Power Base 3 Draws up to 15 amps of current Low Voltage Power Supply A 24 VDC fanformer supply fan motor winding regulated to 15 VDC AC Connector An appropr
38. will be borne by us You must bear the expense of all taxes duties and other customs fees when transporting the product HOW TO OBTAIN WARRANTY SERVICE You must notify us of your need for warranty service not later than ninety 90 days after expiration of the warranty period All components must be shipped in a factory pack Corrective action will be taken within a reasonable time of the date of receipt of the defective product by our authorized service center If the repairs made by our authorized service center are not satisfactory notify our authorized service center immediately DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN PRODUCT THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR PRODUCTS RESULTING FROM SUCH A DEFECT WARRANTY ALTERATIONS No person has the authority to enlarge amend or modify this Crown Warranty This Crown Warranty is not extended by the length of time which you are deprived of the use of the new Crown product Repairs and replacement parts provided under the terms of this Crown Warranty shall carry only the unexpired portion of this Crown Warranty DESIGN CHANGES We reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes in products previously manufactured LEGAL REMEDIES OF PURCHASER No action to enforce this Crown War
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