Phoenix Gold pt1250 Stereo Amplifier User Manual
Contents
1. amplifiers are used within the same rack as the pt1800 pt2400 amplifiers Always mount convection cooled amplifiers above the fan cooled amplifiers Additional fans in the rack will reduce the amount of preheated air entering the fan cooled models AC Power Considerations Ensure that the pt1800 pt2400 is plugged into an outlet capable of supplying the correct voltage specified for your model and enough current to allow full power operation of all the amplifiers plugged into it The current demand of a power amplifier varies depending on several factors including the impedance of the load the output level of the amplifier and the crest factor and duty cycle of the program material Under typical conditions reproducing rock music with both channels driven into a 4 ohm load to the point where musical peaks are just at the clipping point the amplifiers require the following average currents pt1800 amps for 120V versions amps for 230V versions pt2400 amps for 120V versions amps for 230V versions Safety Precautions WARNING IMPORTANT OPERATING CONSIDERATIONS FOR A C POWER SUPPLY CONNECTIONS VITAL SAFETY INSTRUCTIONS The pt2400 pt1800 have two separate A C power cords each supplying power to one amplifier channel Each connection can draw up to 15 amperes of current which is the maximum amount that can be supplied by a single 120 volt branch circuit Therefore the pt2400 pt1800 require TWO separate independent branch circuits be2. connectors e Accepts balanced or unbalanced lines e Heavy duty 5 way speaker binding posts e Independent CH 1 and CH 2 Level Controls with 11 detented positions e Internally configurable for Parallel Mono mode for single channel low impedance operation e Highly efficient Pulse Width Modulated PWM power supply e High efficiency linear tracking output design e Dual stage slow power up e High power to weight ratio 1250 watts 11 pounds e Independent CH 1 CH 2 protection circuits will instantaneously activate if one of the following fault conditions is detected Excessive High Frequency Over Temperature Short Circuit D C Offset e Additional protection circuitry includes Clipping Eliminator AC Line Fuse e Power Connected Standby indicator e 7 LED display per channel including Power Ready and Clip Protect indicators e 2 speed switchable Fan cooled e 70 volt stereo direct drive operation B R SPECIFICATIONS he j Fa im B e features Continuous Average Output Power both channels driven 465 watts per channel into 8 ohms from 20Hz to 20kHz with no more than 0 5 THD 625 watts per channel into 4 ohms from 20Hz to 20kHz with no more than 0 5 THD Parallel mono operation 100 watts into 4 ohms from 20Hz to 20kHz with no more than 0 5 THD 70 volt stereo 600 watts per channel 70 volt parallel mono 750 watts Frequency Response 20Hz to 20kHz 0 0 5 dB gt 200 15 kilohms unbal
3. provided one for each A C line cord For a typical installation in a sound system amplifier rack studio or broadcast facility you must be sure that each power cord is plugged into its own branch circuit just as if you were connecting two individual high power amplifiers An electrician will refer to these AC branch circuits as dedicated circuits because the equipment connected to them that is each pt2400 pt1800 channel will draw as much current as the circuit can supply It follows then that no other equipment may be connected to these same circuits because they are already loaded to maximum capacity The pt2400 pt1800 is not recommended for home installation because the typical home will not have two separate dedicated A C circuits available in close enough proximity to allow proper connection If domestic installation is mandatory a qualified electrician must be called upon to install two dedicated circuits into the location where the pt2400 pt1800 is to be used Magnetic Leakage Considerations If it is necessary to locate the pt1800 pt2400 in the same rack as signal processing equipment then some consideration must be given to their respective locations The power amplifiers s should be mounted in the bottom of the rack Space may be required and should be allowed between the amplifier and signal processing equipment Even though the Carver Magnetic Field type power supply actually generates less stray magnetic field at idle th
4. system strap allows isolating the amplifier circuit ground from the AC line safety ground green wire Isolating the grounds may be necessary in some installations to break a ground loop This is infinitely preferable to breaking the ground pin off the power cord The pt1250 s XLR connector uses the American wiring convention pin 3 hot Note that the pin 3 of the XLR connector corresponds to the tip connection on the TRS phone jack All input connectors are connected in parallel you can parallel the amplifier inputs by patching an unused input connector to its counterpart on the other channel For balanced operation 1 4 inch phone jack Use a 3 conductor TRS 1 4 phone plug The tip of the plug carries the hot non inverting side of the signal the ring carries the low inverting side of the signal and the sleeve is ground XLR Use a male XLR connector Pin 2 carries the hot non inverting side of the signal Pin 3 carries the low inverting side of the signal and Pin 1 is ground For unbalanced operation 1 4 inch phone plug Use a 2 conductor Tip Sleeve 1 4 phone plug The tip of the plug carries the signal and the sleeve is ground The ring connection in the jack is automatically grounded by the sleeve XLR Pin 2 carries the hot non inverting side of the signal and Pin 1 is ground Short Pin 3 to Pin 1 in order to reference the input differential amplifier for the correct gain Note The gain rem
5. unit Excessive heat is the single greatest source of both short term and long term component failure 4 lt z fo a n w W fo a a Mechanical Considerations The pt1250 requires two rack space units 3 5 and a depth of 10 75 inside the rack including the rear supports Secure the unit mechanically using four screws with washers to prevent marring the front panel Neoprene rubber washers are a good choice because they grip the screw head and prevent them from backing out when vibrated or transported Rear Support for Road Applications If the pt1250 is rack mounted and the rack is transported mechanical support for the rear of the amplifier is required This could take the form of a shelf across the rear of the amplifier or brackets that engage the rear of the unit This practice is recommended for all electronic instruments Thermal Considerations When the pt1250 is used free standing no thermal considerations are necessary other than keeping the ventilation holes open If the amplifier is rack mounted ensure that adequate ventilation exists in front of and behind the amplifier When several amplifiers are mounted together in a rack you may need to provide air inlets from the outside of the rack The pt1250 is fan cooled The fan is internally mounted so that it draws air in from the rear and exhausts it out the front The pt1250 may be stacked directly on top of other amplifiers without spacer panels If the pt1250 is used
6. with other amplifiers ensure that the heat output from the other amplifiers doesn t interfere with the ventilation of the pt1250 or vice versa AC Power Considerations Ensure that the pt1250 is plugged into an outlet capable of supplying the correct voltage specified for your model and enough current to allow full power operation of all the amplifiers plugged into it The current demand of a power amplifier varies depending on several factors including the impedance of the load the output level of the amplifier and the crest factor and duty cycle of the program material Under typical conditions reproducing rock music with both channels driven into a 4 ohm load to the point where musical peaks are just at the clipping point the amplifier requires the following average currents pt1250 6 7 amps for 120V versions 3 5 amps for 230V versions Magnetic Leakage Considerations The pt1250 may be mounted without concern for magnetic flux leakage within the confines of common sense For example it s not a good idea to mount any power amplifier near a microphone input transformer or magnetic storage media Input Wiring See page 20 for information on new input module The 1 4 inch phone jacks and XLR connectors for the input signal can be used with either unbalanced 2 conductor or balanced 3 conductor cables Use shielded coaxial cable to conduct the signal from the source i e mixer equalizer CD player to the amplifier In addition a ground
7. 32dB Input Impedance 15 Kilohms Unbalanced 30 Kilohms Balanced CMRR gt 70db amp 1kHz Maximum Current Draw 30 A 4Q rated power Display 7 LED indicators per channel 1 green on 5 yellow signal 1 red clip protect Cooling Rear to front w 100 CFM maximum Connections Input XLR barrier strip Output 5 way binding posts 2 sets channel Size HxWxD 5 25 3u x 19 x 12 75 133mm x 483mm x 324mm Net Weight 46lbs 20 9 Kgs Shipping Wt 55lbs 25 Kgs Due to ongoing research and development all specifications and features effective 4 96 are subject to change without notice SIIMLvV3I T Power Output 8 ohm ch 4 ohm ch 2 ohm ch 8 ohm 4 ohm SPECIFICATIONS Both channels driven 20HzZ 20kHz 750 watts 1200 watts 1500 watts Power Output Series mono operation 20Hz 20kHz 2400 watts 3000 watts Signal to Noise Ratio gt 100dB from rated power 4Q A weighted Frequency Response 20Hz to 20kHz 0 5dB Channel Seperation gt 55db 1kHz Slew Rate 25V us THD 4Q 20 20kHz at 1200W lt 0 5 IM Distortion lt 0 1 Damping Factor gt 200 1kHz Sensitivity 1 5 V rms Gain 34dB Input Impedance 15 Kilohms Unbalanced 30 Kilohms Balanced CMRR gt 70db 1kHz Maximum Current Draw Display Cooling Connections Input Output Size HxWxD Net Weight Shipping Weight 40 A 4Q rated power 7 LED indicators per
8. E TERMINALS Separate SND send and RCV receive terminals for each channel allow the amplifier to be sequenced on and off within a system of multiple amplifiers The two sets of terminals also allow the two channels to be independently turned on and off from a remote location that can provide a 5 to 15 Voltage source The jumper connected from the SND terminal of Channel 1 to the RCV terminal of Channel 2 must be removed for independent operation 14 AC POWER CONNECTORS Two positive locking power cords permit connections to AC distribution systems already pre wired for 12 15 amps per plug Dual A C power cords facilitate easy installation and removal of the pt2400 pt1800 from the amplifier racks 15 FUSES Channel 1 and Channel 2 have independent A C line fuses pt1250 Installation Location and General Precautions Observe the following precautions when choosing a location for your amplifier A Do not expose the unit to rain or moisture If a fluid or foreign object should enter the unit disconnect the power plug and contact an authorized dealer or service center Do not pull out the plug by pulling on the cord grasp the plug firmly B Protect from heat and allow adequate ventilation Place away from direct sources of heat such as heating vents and radiators All components produce some heat during operation so make sure that the ventilation holes are not covered and that air is allowed to circulate freely behind beside and above the
9. FANA ENE ENN pt1250 pt1800 pt2400 Professional Stereo Power Amplifier The lightning flash with arrowhead gbo mas 2 equilateral nele 1s intended to alert the user to the CAUTION presence of uninsulated dangerous 4 lt z fo a a w W fo a a RISK OF ELECTRIC SHOCK voltage within the product s DO NOT OPEN enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK The exclamation point within an NO USER SERVICEABLE PARTS INSIDE equilateral triangle is intended to alert the user of the presence of important REFER SERVICING TO QUALIFIED SERVICE PERSONNEL operating and maintenance servicing instructions in the literature accompanying the appliance Introduction sas n a n a NER RENA 1 Unpacking and Paperwork s sssssssrsssrssersrrssrrnt 1 Features and Specifications PLU E E E I E nae 2 PES OO se ts ss enade renee tern RNE 4 DF OOS aserne eden 6 Controls and Functions 8 Dee T 8 PULS 00 24 00 oa lerende 10 Installation pt1250 Location and General DPrecauniOnS eee 12 Mechanical Considerations sese eee 12 Rear Support for Road Applications sees sese eee eee eee 12 Thermal Considerationg sss sss see eee 12 AC Power Considerations 12 Magnetic Leakage CONSIderatiONS sssssesreereresrersrsrrrrrrrrrrrrrrrrna 12 Tipt TT 12 Output ntroduction Co
10. TOR SWITCH The Clip Eliminator Switch enables circuitry which senses the onset of clipping and limits the output distortion to approximately 1 for up to 8 dB of overdrive at the input 8 XLR POLARITY SWITCH The XLR Polarity Switch conveniently configures both XLR connectors for Pin 3 Pin 2 or Pin 2 Pin 3 the clear security cover can be installed after switches are set 9 INPUT CONNECTORS The pt2400 pt1800 amplifier comes equipped with XLR and Barrier inputs The XLR connector is wired in parallel with the barrier strip connector on each channel Channel 1 is used to drive both channels in either mono configuration 10 FAN FILTER An expanded foam filter is used to keep dust and airborne debris out of the amplifier s cooling system 11 OUTPUT BINDING POSTS Two sets of binding posts for each channel provide a convenient means to connect multiple loudspeaker boxes The channels alternate vertically and allow the connection of multiple loudspeaker boxes in the Series Mono Bridged configuration 12 GROUND LIFT TERMINALS These two connections on the barrier strip are provided to help eliminate noise in systems where ground loops are a problem For maximum safety during an amplifier fault condition the jumper between chassis and power supply grounds should remain installed When using the power supply ground terminal for the control voltage common in the power sequencing operation leave the jumper installed 13 SEQUENC
11. ains the same regardless of whether the input is balanced or unbalanced Note The polarity of the balanced inputs can be reversed by changing four jumpers located on the Input Board Output Wiring Use heavy gauge wire for speaker connections The greater the distance between the amplifier and the speakers the larger the diameter the wire should be to minimize power losses across the wire and improve the damping of the speaker Wire thickness specifications or gauges get larger as the wire gets thinner thus 14 gauge wire is thicker than 16 gauge wire Use the following as a guide up to 25 ft use 16 gauge up to 40 ft use 14 gauge up to 60 ft use 12 gauge up to 100 ft use 10 gauge up to 150 ft use 8 gauge up to 250 ft use 6 gauge This will insure that the resistance of the speaker wire is less than 5 of 4 ohms resulting in a transmission loss of less than 0 5 dB The multi way binding posts can accept spade lug bare wire or banana connections Be sure that all the fine strands of the wire are twisted together and contained within the connector If even one strand is loose and can touch the adjacent terminal a short circuit may result Class I NEC wiring must be used For stereo operation use the red and black binding posts associated with each channel Unlike most solid state amplifiers the pt1250 can be operated with its output connections paralleled CAUTION Internal jumpers must be moved before this connection or operating mod
12. al backup for channel 1 All other amplifiers have power switches turned off and sequence switches turned on Each amplifier channel controls the next amplifier channel in succession via an internally generated 11 4 VDC control voltage that is present at the SND terminal In the unlikely event an amplifier should fail the amplifiers sequenced on after this unit will NOT turn off The control voltage at the RCV terminal of the failed amplifier will carry through the failed amplifier and keep the next amplifier on Properly operating amplifiers will not be taken out of service in a sequenced configuration by inoperative amplifiers However if the master amplifier channel 1 of the first amplifier should fail then the following amplifiers would power down Therefore use channel 2 of the first amplifier as a backup to channel 1 by switching on both channel 1 and channel two power switches Channel 1 of the master amplifier may also be backed up by connecting a DC control voltage battery to it s RCV terminal and ground The rack shown below may also be turned on by a control voltage received from another rack or a control voltage from a remote location PROFESSIONAL Remote Power Control The rack shown in Figure 4 may be powered up and powered down from a remote location ie mixing console or stage position not located near the amplifiers It is possible to control the amplifiers independently by removing the jumper between channel 1 SND an
13. an most conventional designs the stray magnetic field produced at full power output is approximately the same as a conventional power supply design Input Wiring The pt1800 pt2400 have two types of input connections 3 pin type XLR and Barrier Use the connector most appropriate to your installation For optimum input performance with respect to noise and common mode rejection drive the amplifier in the balanced mode configuration Besides eliminating RFI radio frequency interference and EMI electro magnetic interference the balanced configuration allows the signal ground between the signal source and the amplifier to be separated thereby eliminating a potential ground loop Output Wiring Use heavy gauge wire for speaker connectors The greater the distance between the amplifier and the speakers the larger the diameter the wire should be to minimize power loss across the wire and improve damping of the speaker Wire thickness specifications or gauges get larger as the wire gets thinner thus 14 gauge wire is thicker than 16 gauge wire Use the following as a guide up to 25 ft use 16 gauge up to 40 ft use 14 gauge up to 60 ft use 12 gauge up to 100 ft use 10 gauge up to 150 ft use 8 gauge up to 250 ft use 6 gauge This will insure that the resistance of the speaker wire is less than 5 of 4 ohms resulting in a transmission loss of less than 0 5 dB The multi way binding posts can accept spade lug bare wire or banana connection
14. anced each leg to ground 30 kilohms balanced Damping Factor Input Impedance Sensitivity 1 5 Vrms for rated power into 4 ohms Gain 32 dB 0 5 dB Input Overload 15 dBu THD lt 0 5 IM Distortion lt 0 1 Signal to Noise Ratio gt 105dB weighted ref to rated power into 4 ohms Slew Rate 25V US CMRR gt 70dB 1kHz Power Consumption 1200W full power Power Requirements 120V AC 60Hz USA and Canada Other voltages as required for export Fusing 10 amp slo blo 120V 60Hz 5 amp Slo blo 230V 50Hz Display 7 LED indicators per channel 1 green READY 5 yellow SIGNAL 1 red CLIP PROTECT 3 50 2U x 19 x 10 25 89mm x 483mm x 273mm 11 Ibs 5 0kgs 15lbs 6 8kgs Size H x W x D Net Weight Shipping Weight Due to ongoing research and development all specifications and features effective 4 96 are subject to change without notice SIIMLvV3I T SPECIFICATIONS Power Output Both channels driven 20HZ 20kHz 8 ohm ch 600 watts 4 ohm ch 900 watts 2 ohm ch 1100 watt Power Output Series mono operation 20Hz 20kHz 8 ohm 1800 watts 4 ohm 2200 watts Signal to Noise Ratio gt 100dB from rated power 4Q A weighted Frequency Response 20Hz to 20kHz 0 5dB Channel Seperation gt 55db 1kHz Slew Rate 25V us THD 4Q 20 20kHz at 900W lt 0 5 IM Distortion lt 0 1 Damping Factor gt 200 1kHz Sensitivity 1 5 V rms Gain
15. channel 1 green on 5 yellow signal 1 red clip protect Rear to front w 100 CFM maximum XLR barrier strip 5 way binding posts 2 sets channel 5 25 3u x 19 x 12 75 133mm x 483mm x 324mm 48 Ibs 21 8 Kgs 59 Ibs 26 8 Kgs Due to ongoing research and development all specifications and features effective 4 96 are subject to change without notice PROFESSIONAL QD nas DOG antro NNE Fonction Pressing this switch turns on the clipping eliminator circuit In this mode the amplifier output remains undistorted even when overdriven by 8dB 2 LEFT RIGHT VOLUME CONTROLS 10 step attenuators that adjust the relative output level of the pt1250 The amount of attenuation corresponds to the front panel marking in dB In parallel mono mode only the LEFT level control is active 3 POWER SWITCH This turns the amplifier on 4 POWER LED A red LED that illuminates when the amplifier is on 5 CH1 CH2 STATUS INDICATORS These LEDs display information about the operation of the amplifier READY These LEDs illuminate green when the power is on and the amplifier is ready to operate The READY LEDs illuminate red when the power switch is first turned on while the power supply is stabilizing prior to the speaker output relays switching in or when the amplifier is in protect mode SIGNAL These LEDs illuminate yellow when a signal is present at the Speaker Output jacks to provide an indication of out
16. d channel 2 RCV terminals This allows remote power on off to an area or zone that a particular channel is assigned to Figure 3 Figure 4 b to 16 900 Operating Tips Using the pt1250 pt1800 pt2400 Once the amplifier has been installed and wired into the system you are ready to use it Here are some tips to help you get the most from it e Verify that all switches Stereo Mono Clipping Eliminator and Level Defeat have been set to the mode that you want e When you power the system up for the first time out of the carton it s a good idea to start with all of the amplifier level controls turned down then advance them slowly one at a time so that you can confirm that each amplifier channel is operating normally e Be sure that the Input Level controls are set sufficiently high to allow the preceding device to drive the amplifier to full output For most installations this is wide open fully clockwise e Once you have established settings it is a good idea to mark them down either on paper or on pieces of tape or sticky dots attached to the amplifier s panel In bi amplified multi amp systems it is a good idea to start with the low frequency amplifiers turned off or down and to check each frequency range from highest to lowest to ensure that each loudspeaker component is operating correctly In Case of Difficulty If vou re having trouble or suspect a problem with the pt1250 1800 2400 try some simpl
17. d packing materials in case shipping is required Please do not ship Parcel Post Include a complete description of the problem the associated components and connections and a copy of the purchase receipt Initial shipping costs are not paid by Carver Professional Return shipping costs will be pre paid if repairs were covered by the scope of this warranty YOU MUST RETAIN AND PROVIDE YOUR SALES RECEIPT TO OBTAIN COVERAGE UNDER THIS LIMITED WARRANTY The warranty Period begins from the date of first consumer purchase from an Authorized Carver Professional Dealer LIMITATIONS OF IMPLIED WARRANTIES All implied warranties for merchantability and fitness for a particular purpose are limited in duration to the warranty period for your product unless otherwise provided by the state law EXCLUSION OF CERTAIN DAMAGES In no event shall Carver Professional be liable for property or any other incidental or coincidental damages which may result from the failure of this product If your Carver Professional product proves defective in material or workmanship the liability of Carver Professional shall be limited to the repair or replacement at the option of Carver Professional of any defective part STATE LAWS MAY DIFFER Some states do not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limitations may not apply to you This warranty gives you spec
18. e is allowed These changes must be made at the Carver Professional factory or by a qualified service technician Only the left input connections and level control are used in parallel mono mode The minimum load impedance is two ohms or greater For driving a single load which may be comprised of one or more speakers connected in series parallel or series parallel the red binding posts must be wired in parallel wired together and the load connected to either red and black binding posts In either case ensure that the total load impedance is not lower than that listed in the specifications for the mode of operation that you have selected Polarity Loudspeakers must be connected with consistent polarity for correct phasing between them Incorrect phasing will do no physical harm but frequency response will be affected The key is to make sure that both speakers connected to the speaker terminals are hooked up the same way Connect at the speaker outputs to on the back of the speaker and at the speaker outputs to on the back of the speaker 70V Distribution Systems The pt1250 has sufficient output voltage capability in stereo mode to drive 70 volt distribution systems without using a step up transformer at the amplifier The amplifier delivers 300 watts per channel to the 70 volt system Transformers are still required at each loudspeaker as is the case with all 70 volt systems By re calculating the tap power ratings
19. e troubleshooting before contacting an Authorized Carver Professional Service Center No Sound No Power This is usually an indication of a power supply problem either the power line itself or the amplifier s power supply 1 Amplifier power is switched off 2 Linecord is disconnected 3 Poor fit between the plug and AC receptacle 4 Power off at AC receptacle check with tester or lamp 5 The amplifier is plugged into a switched outlet Verify that the outlet is live 6 Amplifier fuse has blown Check and replace fuse Power On Low Output or No Output Low or no output problems are usually signal source bad cable or partial output short circuit related If the items listed below check out then the problem may be internal to the pt1250 1800 2400 1 The Input Level controls are set too low 2 Move the input connections to another amplifier that you know is working to verify that it is not a source problem 3 Check the speaker connections Be sure that there are no small strands of wire touching similar strands coming from the other wire in the cable 4 Make sure the speakers are functioning correctly 5 If you are using bridged mono mode ensure that the Stereo Mono switch is set correctly 6 Use a voltmeter to determine if the power line voltage is dropping excessively when the amplifier is driven hard Playback Is Mixed with Hum 1 Check or replace the connecting cables 2 Make sure that each screw terminal con
20. g Eliminator Switch located on the back panel Note If the Input Level control s are turned down far enough a sufficiently large input signal can drive the input differential amplifier into clipping The Clipping Eliminator circuit cannot remedy this kind of clipping Likewise it has no effect on clipping that occurs prior to the amplifier inputs at the mixer or equalizer stage for example Power ON Sequencing The pt2400 pt1800 have one sequence switch per channel that allows each channel to be powered up in 3 second intervals The amplifiers power down at a much slower rate which is a function of the power supply decay In very large systems it is advisable to sequence the amplifiers on and off in groups with one master control amplifier per group The amplifiers come from the factory equipped with a jumper between the SND send terminal of channel 1 and the RCV receive terminal of channel 2 This programs channel 1 to be turned on first and provide the turn on signal for channel 2 The channel 2 send terminal then connects to the next amplifier s receive terminal A DC control signal of 10 volts 5 milliamps applied to the RCV terminal powers up the amplifier channel Fig 3 shows a typical set up in a 3 rack with 3 amplifiers In this case the top amplifier is the master amplifier Its channel 1 power switch controls the power up and power down sequence for the whole rack and possibly additional racks Channel 2 may be used as an option
21. ific legal rights and you may have other rights which vary from state to state OTHER IMPORTANT PROVISIONS Carver Professional reserves the right to make changes in design and improvements to its products without the responsibility of installing such changes to improvements on products previously sold by Carver Professional We suggest that you attach your purchase receipt to this Warranty and keep both documents in a safe place Thank you for your choice of a Carver Professional Amplifier NOTE The following warranty is exclusive to the United States and its possessions and territories Please see your Carver Professional dealer or distributor for the correct warranty information in your area or locale 4 lt z fo a P w W fo x a XA TN EET 180 pay D Year Performance Guarantee meea Warranty A Division Of Phoenix Gold International Inc 9300 North Decatur e Portland OR 97203 e Tel 503 978 3344 e Fax 503 978 3302 Part 8100 0089 Rev B
22. internally connected together 10 GROUND Barrier strip connections Removing this jumper isolates the amplifiers power supply ground from the amplifier chassis This may be necessary to eliminate ground loops in some systems The amplifier chassis is always connected to the safety ground line plug ground or green wire of the power cord With the jumper removed the amplifier s circuit ground is connected to the amplifier s chassis ground via a 27 kilohm resistor in parallel with a 0 1 mfd capacitor 11 INPUTS Each channel has parallel connected female XLR connectors and 1 4 inch tip ring sleeve phone jacks These are the input connectors for the amplifier Since the jacks are connected in parallel the remaining jack can be used as an output when daisy chaining several amplifier inputs CARVER MAGNETIC FELD POWER AMPURER rep WR mig R L a L mamn biii rek Mth on og 4 lt z fo a o w W fo a a Controls And Functions 1 POWER SWITCHES Channel 1 and Channel 2 power switches independently power up each channel The slow start up feature of each power supply allows both switches to be pushed simultaneously 2 SEQUENCE SWITCHES These switches make it possible to sequentially turn on and off amplifiers in one rack or multiple racks of units A group of amplifiers can be powered up with the power switch on a designated master amplifier or remotely via a 5 to 15 VDC voltage source Two sequence switches allow re
23. me commitment to providing the world s finest components for music and sound reproduction Thanks for placing your confidence in Carver Professional We know your amplifier will provide many years of dependable service and reliable sound reproduction Unpacking and Paperwork Carefully unpack the amplifier and keep the original carton and packing materials for future moving shipment or long term storage After opening the box please check for any visible signs of damage that were not apparent from the outside of the box If you do encounter what appears to be concealed damage please consult your Carver Professional Dealer before installing the unit Important Paperwork Make sure to save your sales receipt Your receipt is extremely important to establish the duration of your Limited Warranty and for insurance purposes Next make a note of the serial number which is located on the back of the amplifier Record it in the space provided below for convenient reference Model pt1250 ptl 00 pt2400 Serial Number Purchased at Date Finally take a moment to fill out and return the Warranty Registration Card packed with the amplifier and return it to Carver Professional This will allow us to keep you informed about new products as they become available 7 ft ra O E a K 3 SN O O a FEATURES pt1250 e features 6 465W per channel into 8 ohms 625W per channel into 4 ohms e XLR and 1 4 TRS input
24. mote power control of Channel 1 and Channel 2 independently 3 LEFT AND RIGHT LEVEL CONTROLS Eleven step attenuators adjust the relative output level of the amplifier The amount of attenuation corresponds to the front panel markings in dB For maximum input sensitivity and signal to noise ratio at the input set level controls for full clockwise rotation 4 CH1 CH2 STATUS INDICATORS These LEDs display information about the operation of the amplifier READY These LEDs illuminate green when the power is on and the amplifier is ready to operate SIGNAL These LEDs illuminate yellow to indicate the output voltage level of the amplifier in dB relative to the maximum output CLIP PROTECT These LEDs illuminate red to indicate amplifier clipping excessive high frequency protection or limiting by the clip eliminator option 5 DUAL MONO SWITCH The Dual Mono Switch configures the input to allow both channels to be driven from a mono source via the channel 1 input NOTE channel 2 XLR connector may be used to patch to other amplifiers if parallel connections are made on the barrier block ie ch 1 connected to ch 2 etc 6 SERIES MONO BRIDGE SWITCH The Series Mono Switch inverts the phase of channel 1 which produces a differential voltage between Channel 1 red binding post and the Channel 2 red Channel 1 s XLR and Barrier drive both channels Minimum load impedance in this configuration is 4 ohms 7 CLIP ELIMINA
25. nection is tight 3 Signal cables may have been routed too closely to AC cables power transformers motors or another type of EMI inducing device 4 Try connecting another source to the power amplifier inputs If the hum stops the problem lies with the original source component Distortion Distortion is usually caused by excessive loss in the input controls the mixer equalizer crossover can t produce enough output overdriving resulting in output clipping or current limiting caused by excessively low load impedances 1 Check the setting of the Input Level controls If set too low the preceding piece of equipment may not have sufficien output to overcome the loss 2 Check the speaker connections and verify that all screw connections are tight and that there are no stray strands of wire to cause short circuits 3 Verify that the total load impedance presented to the amplifier is within the limits described in this manual for the mode of operation selected Cafe and Service SSIStance Care Wipe off the pt1250 1800 2400 front panel and chassis from time to time with a soft dry cloth If you have something stubborn to remove use a mild dish soap or detergent sparingly applied to a soft cloth Don t use alcohol ammonia or other strong solvents Service Assistance We suggest that you read the Limited Warranty completely to fully understand your warranty service coverage Please promptly complete and return the Warranty Registra
26. ngratulations on your purchase of a new Carver Professional Power Amplifier It is backed by state of the art engineering and manufacturing techniques to bring you the best in quality craftsmanship and reliable performance The pt1250 pt1800 and pt2400 are specially designed for pro touring applications Their rugged construction and low profile make it ideal for sustaining the abuses of the road with reliability and space saving economy The pt1250 is rated at 625 watts per channel into 4 ohms and 465 watts per channel into 8 ohms The pt1800 is rated at 900 watts per channel into 4 ohms and 600 watts per channel into 8 ohms The pt2400 is rated at 1200 watts per channel into 4 ohms and 750 watts per channel into 8 ohms The sophisticated protection circuits designed into this amplifier will protect your system should an unexpected fault occur They also protect the amplifier from excessive temperature continuous current limiting and shorted outputs The balanced input uses a high quality high common mode rejection differential amplifier for exceptional hum and noise rejection The sequencing feature on the pt1800 and pt2400 allows a rack of amplifiers to be powered up from a remote location The daisy chain connection scheme causes each amplifier to turn on in sequence preventing the large in rush current that can occur when an entire rack of amplifiers is turned on simultaneously This power amplifier was designed and manufactured by people with a lifeti
27. on the step down transformers used at the loudspeaker end the pt1250 can deliver additional power beyond 300 watts 4 lt z fo a o w W fo a a Clipping Eliminator This circuit prevents the input signal from exceeding the point where it would drive the amplifier into hard clipping It has no effect on the signal until it reaches the point where clipping would occur The larger the input signal the more the signal is reduced to keep the output just below clipping The Clipping Eliminator circuitry is inactive when the unit is shipped from the factory but can be activated with the Clipping Eliminator Switch located on the front panel Note If the Input Level control s are turned down far enough a sufficiently large input signal can drive the input differential amplifier into clipping The Clipping Eliminator circuit cannot remedy this kind of clipping Likewise it has no effect on clipping that occurs prior to the amplifier inputs at the mixer or equalizer stage for example pt1800 2400 Installation Location and General Precautions Observe the following precautions when choosing a location for your amplifier A Do not expose the unit to rain or moisture If a fluid or foreign object should enter the unit disconnect the power plug and contact an authorized dealer or service center Do not pull out the plug by pulling on the cord grasp the plug firmly B Protect from heat and allow adequate ventilation Place away from direct
28. put power relative to full power 0dB CLIP PROTECT These LEDs illuminate red when the power switch is first turned on when the output begins to clip or whenever there is a fault condition detected that causes the output relay s to disengage These fault conditions include excessive DC Offset excessive heatsink temperature and short circuits at the speaker output s Note The relays operate independently for each channel Therefore it is possible for one channel to operate normally while the other is in protect mode Modd FT 1250 Magnetic bad Amfi 6 POWER CORD Connect to a properly configured outlet providing the line voltage specified for your model 7 FAN SPEED Push button switch that sets the idle speed of the cooling fans For normal usage use the low speed position The fan speed is proportional to the amplifier power output 8 FUSE AC power line fuse for the pt1250 For the 120 volt pt1250 use only one of the following 10 ampere slo blo fuses Bussman MDA 10 amp Little Fuse 3AB 10 amp Schurter SPT 001 2534 10 amp For the 230 volt model use only Bussman MDA 5 amp Little Fuse 3AB 5 amp Schurer SPT 034 5239 5 amp Repeated fuse blowing is a sign of internal distress 9 LEFT RIGHT SPEAKER OUTPUT 5 way binding posts used to connect the loudspeakers to the amplifier outputs The red terminal is the signal connection the black terminal is the signal return connection The black terminals are
29. s Be sure that all the fine strands of the wire are twisted together and contained within the connector If even one strand is loose and can touch the adjacent terminal a short circuit may result Class I NEC wiring must be used The pt1800 pt2400 has two sets of output connections per channel They alternate vertically top to bottom Ch 1 Ch 2 Ch 1 Ch 2 WARNING Hazardous voltages may be present at the output terminals Never contact the output terminals while operating the unit WARNING Channel 1 and 2 red binding posts are hot and should never under any circumstances be connected together or directly to ground CAUTION Make sure the total power handling capability of the loudspeakers or test loads are adequate to handle the high output capability of the amplifier Carver Professional will not be responsible for blown loudspeakers Consult the speaker manufacturer if in doubt For minimum noise do not connect channel 1 and channel 2 loudspeakers return black binding posts together However doing so will not harm the amplifier or loudspeakers Use both sets of binding posts if multiple loudspeakers are to be connected in parallel on one channel Maintain a minimum of 2 ohms per channel PROFESSIONAL Polarity Loudspeakers must be connected with consistent polarity for phasing between them Incorrect phasing will do no physical harm but frequency response will be affected The key is to make sure that both speakers connected to
30. sources of heat such as heating vents and radiators All components produce some heat during operation so make sure that the ventilation holes are not covered and that air is allowed to circulate freely behind beside and above the unit Excessive heat is the single greatest source of both short term and long term component failure Mechanical Considerations The pt1800 and pt2400 requires three rack space units 5 25 and a depth of 12 75 inside the rack including the rear supports Secure the unit mechanically using four screws with washers to prevent marring the front panel Neoprene rubber washers are a good choice because they grip the screw head and prevent them from backing out when vibrated or transported Rear Support for Road Applications In portable racks it is mandatory that the rear of the chassis be supported The amplifier s rear rack supports are equipped with slots that can be used to support the rear of the chassis Thermal Considerations The amplifier s heat dissipation is thermally managed by a two speed fan that produces air flow from the back to front Side vents also move air within the chassis that effectively cool power supply components It is essential that intake and exhaust areas of the amplifier be kept clear for maximum performance The pt2400 pt1800 amplifiers may be stacked directly on top of each other without the use of spacer panels Additional fans may be required in the rack if convection cooled no fan
31. the speaker terminals are hooked up the same way Connect at the speaker outputs to on the back of the speaker and at the speaker outputs to on the back of the speaker Dual Mono Figure 1 shows the rear panel connections for dual mono operation All selections and connections should be made with the power OFF Bridged Mono Figure 2 shows the rear panel connections for mono bridged operation All selections and connections should be made with the power OFF I DE ova mono CAUTION In bridged mono operation the output connections are actually a balanced output configuration This means that both output terminals have voltage present neither one may be grounded 70 Volt Distribution Systems The pt2400 pt1800 have the capability of driving a 70 volt distribution system directly without the need for step up transformers pt2400 in stereo 1200W channel pt1800 in stereo 700W Channel For minimum wire loss use appropriate wire size for the length of distance travelled Clipping Eliminator This circuit prevents the input signal from exceeding the point where it would drive the amplifier into hard clipping It has no effect on the signal until it reaches the point where clipping would occur The larger the input signal the more the signal is reduced to keep the output just below clipping The Clipping Eliminator circuitry is inactive when the unit is shipped from the factory but can be activated with the Clippin
32. tion Card Also be sure to save the sales receipt in a safe place It will be necessary for warranty service If your CARVER Professional product should require service you may contact the CARVER Professional Technical Service Department by calling 503 978 3363 or by writing to us at the Factory address shown below We will then direct you to the nearest in our national network of Authorized Warranty Service Centers or give you detailed instructions on how to return the product to us for prompt action If you should have questions or comments please write to the Factory address given below Please include the model and serial number of your Carver Professional product your complete address and a daytime phone number M D t 1 2 5 0 Replacement input board for PM 2 0t and pt1250 4 lt z fo a n w W o a a Improved CMRR gt 80dB 1kHz The NEW I M pt1250 resolves some of the common complaints of the pt1250 Redesigned using the SSM2141 op amp to provide greatly increased CMRR the I M pt1250 now attains common mode rejection gt 80dB 1kHz or gt 70dB 20kHz This allows the use of long input lines in electrically noisy environments without annoying noises becoming part of your program Flatter broadband frequency response The frequency response of the new input board is flat from 20Hz to beyond 200kHz 0 0 2dB New grounding scheme eliminates ground loops An improved grounding scheme shortens the chassis gro
33. und path to millimeters eliminating ground loop problems New user selectable pin2 or pin3 hot A jumper on the input board allows the user to select pin2 or pin3 as the hot leg of the XLR connector Warranty Information Professional Power Amplifiers 5 years WHAT IS COVERED THIS WARRANTY COVERS DEFECTS IN MATERIALAND WORKMANSHIP ONLY This limited Warranty DOES NOT extend to 1 Damage caused by shipment 2 damage caused by accident misuse abuse failure to perform owner maintenance or operation contrary to the instructions in the Carver Professional owner s manual 3 units on which the serial number has been defaced modified or removed and 4 damage resulting from modification or attempted repair by any other person than authorized by Carver Professional WHAT WE WILL PAY FOR Carver Professional will pay all labor and material expenses for items covered under this Limited Warranty See the next section concerning shipping charges WHAT YOU MUST DO TO OBTAIN WARRANTY SERVICE In the event your Carver Professional product requires service contact your Carver Professional authorized dealer contractor or contact Carver Professional ATTN Customer Service Dept 9300 N Decatur Portland OR 97203 or call the Customer Service Department directly at 503 978 8510 You will be directed to an Authorized Carver Service Station or receive instructions to ship the unit to the factory Please save the original shipping carton an
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