Precision Power PCX 250 User's Manual
Contents
1. Before beginning disconnect the negative terminal of the battery prior to working on the positive terminal to prevent a short to ground This is important unless you want to spend the rest of your life with a nickname like Sparky or Smokey Reconnect the negative terminal only after all connections have been made Em i i i F i i i i Warning A Main Fuse must be installed within 18 of battery TROUBLE SHOOTING NO SOUND Is the LED lit YES NO Check Power and Remote turn on wire for voltage Make sure Ground wire is secure STILL NO SOUND See your Authorized PrecisionPower Dealer or call 1 800 62POWER SOUND IN ONE CHANNEL ONLY Reverse left and right speakers by unplugging the speaker connector turning it over and plugging it back in SOUND IS NOW IN OPPOSITE CHANNEL SAME CHANNEL Reverse RCA inputs Problem is in the speaker or speaker wire of the silent channel SOUND IS NOW IN OPPOSITE CHANNEL SAME CHANNEL Reverse RCAs at head unit Problem is in the Amplifier See your local Authorized PrecisionPower Dealer or call 1 800 62POWER SOUND IS NOW IN OPPOSITE CHANNEL SAME CHANNEL Problem is in the head unit Problem is in the RCAcables or before the amplifier CARR PROTECTION CECT Short Circuit Protection engaged The amplifier will turn off and try to come back on immediately The amplifier will cycle like this indefinitely with blips of sound each time If t2. above limitations or exclusions may not apply to you 8 Your product will be serviced on an in warranty basis within the warranty period for the correction of warranted defects If improper operation of your PrecisionPower product should occur contact your Authorized Dealer for assistance with the return and factory repair of your PrecisionPower product If an Authorized Dealer is not available return the unit including your name telephone number return address a copy of your sales receipt and a description of the problem to PrecisionPower Service Department 9235 S McKemy Street Tempe AZ 85284 TO RETURN PrecisionPower PRODUCTS OUTOF WARRANTY Return the unit postage prepaid in the original protective carton Please include a description of the problem and if desired a request for an estimate of repair costs Unless a request for an estimate is included the unit will be repaired as necessary Please contact PrecisionPower Customer Service at 1 800 62 POWER for questions concerning out of warranty repair charges Repaired unit will be returned with an itemized statement C O D 21
3. added expense and installation of an outboard crossover The speaker outputs of your amplifier are high pass low pass or all pass depending to the HP LP Full switch on the front endplate You would choose low pass switch middle to use this amp for subwoofers choose high pass switch left or full switch right to use this amp for full range speakers The RCAoutputs are controlled by a separate HP LP Full switch and are always independent of the speaker output crossover As well as being able to independently select HP LP Full your new PCX amplifier allows independent selection of frequencies from 30 4kHz See page 19 NOTE The System Diagrams beginning on page 15 show several ways to use the virtually unlimited PCX amplifiers internal crossovers in your system SOLUS TING INPIIM GAI 1 Adjust all amplifier input gain controls to just above minimum sensitivity fully counterclockwise 2 Using the cleanest music source CD playing turn up the head unit source volume until you can hear distortion Now turn it down a bit until you cannot hear the distortion usually just below full volume 3 Increase the Amplifier gain clockwise until the onset of audible distortion Then decrease the gain to the point just before the distortion starts This setting minimizes background noise and prevents overload 4 Repeat step 3 for any remaining amplifiers in the system EMDPLATE MNAC 1 Cooling Plenums Maintain a minimu
4. running a mono output from the same amplifier is accomplished by running the stereo speakers normally and tapping into the appropriate wires for the mixed mono channel left channel positive for the positive speaker wire and right channel negative for the negative speaker wire Speaker impedance should be no lower than 2 Ohms on the stereo channels and 4 ohms on the mono channel NOTE Passive crossovers must be used for mixed mono operation Choose a low pass crossover around 100Hz for your subwoofer then choose a high pass crossover for your stereo channels The high pass crossover must be at the same or slightly higher frequency than the low pass crossover to maintain the correct impedance See your PrecisionPower dealer or call 1 800 62POWER for more information about passive crossovers TWEET EF 4 La A I rWEETEH MICE ce E 7 ORANGE PRO SUE ENANA The following is a basic formula to be used as a guide to determine current draw A50 amplifier efficiency rating is used as an average Your new PCX amplifier is more efficient than most other amplifiers This formula is to be used as a guideline Using wire of a larger gauge can only improve the current transfer of your system Do not use smaller gauge wire Total Amplifier RMS output x 2 Total Input Wattage from car Total Input Wattage Current Draw in Amps Supply Voltage Example A POWERCLASS PCX 280 amplifier has two channels at 80w per channel RMS rati
5. DRCGRAIMA TOOL S PARTOS FOR INS TALLA TICON NOTE TOOLS ARE NOT SUPPLIED all PCX250 Small flat blade screwdriver PP S Phillips screwdriver 2 or medium sized Ba Wire cutters Wire strippers Such 4 6 round head screws and 1 8 sheet metal screw or nut bolt flat washer 3 SI pu star washer see detail REA gt Y gt xK 2 Ring connectors large enough to accommodate your method of grounding In line fuse or circuit breaker see fuse chart below Power and ground wire see Power Wire Calculator on page 4 Speaker wire 12 to 16 gauge Grommets sized to work with the power wire you plan to use in your installation Tube of silicone sealant PLS REDOOMREMENTO You will need to install an in line fuse or circuit breaker in the power wire within 18 of the battery This fuse or circuit breaker is to protect your vehicle from fire in case the power wire shorts to the vehicle body If you are only using one amplifier use the fuse rating indicated in this chart If you are using more than one amplifier add up the fuse ratings for all the amplifiers This sum is the rating for your main fuse or circuit breaker You may also want to add a power distribution block near your amplifiers to distribute large gauge power cable to multiple amplifiers PCX280 NOLL YONELLLY LANE Amplifier Maximum Fuse Rating PCX 250 30 Amp G QBASS REMOTE PCX 280 35 Amp SASTEM DESIGN 1 J A AAA _ _ Q u
6. PrecisionPower 9235 South McKemy Street Tempe Arizona 85284 www precisionpower com 8900 4005 NOTES O ___r______rrT_T _ _ o gg Gi NEW Advanced Instrumentation Input Stage NEW 12dB Octave HP LP FULL 30 4kHz Crossover NEW Independent Line Output Crossover 30 4kHz Adaptive PWM Power Supply Triple Darlington Output Stage AP IV Protection Circuitry Forced Air Thermal Management PCX 280 QBASS Bass Boost PCX 250 QBASS Plus Bass Boost PCX 280 High Voltage Input Capability with 12dB Attenuation Switch Gold Plated RCAInput and Output Connectors PowerLock Speaker and Power Wire Connectors Mixed Mono Stereo Operation 3 Yr Warranty when installed by an Authorized PrecisionPower Dealer BP NCAA FANS Power Bandwidth 10 Hz 50 kHz Total Harmonic Distortion lt 0 02 S N Ratio gt 110dB Input Topology Instrumentation Input Sensitivity 150mv 12 Volts RMS Input Impedance 10k Ohms Load Impedance stereo 2 8 Ohms Load Impedance bridged 4 8 Ohms Supply Voltage 11 15 Volts Damping Factor gt 500 Slew Rate gt 50 V uS QBASS Up to 12dB Boost 40Hz QBASS PLUS Up to 18dB Boost 30 36 44 or 60Hz Crossovers 12dB Octave Crossover Frequency 30 4kHz Idle Current PCX 250 1 5 Amps PCX 280 2 Amps POLE RATINGS MODEL 4ohm STEREO 20hm STEREO 4ohm MONO PCX 250 2X 50 2X100 1 X 200 PCX 280 2 X 80 2 X 160 1 X 320 ALL POWER RATINGS SHOWN ARE TESTED 12V 20 20kHz 20 1 BLOCK
7. ace at no charge to the original purchaser any unit which PrecisionPower examination discloses to be defective and under warranty provided the defect occurs within three 3 years from the date of original purchase when the unit is installed by an Authorized Dealer and the product is returned immediately to PrecisionPower This warranty is not transferable 2 Non Authorized Dealer Installed Products PrecisionPower will either repair or replace at no charge to the original purchaser any unit which PrecisionPower examination discloses to be defective and under warranty provided the defect occurs within ninety 90 days from the date of purchase and the product is returned immediately to PrecisionPower Warranty claims beyond ninety 90 days for Non Authorized Dealer Installed Products will be for parts only and will extend for one 1 year from the date of purchase This warranty is not transferable 3 Internet and mail order products purchased from non authorized PrecisionPower dealers are not subject to factory warranty PrecisionPower does not endorse or approve of internet and mail order sales but will repair products at current non warrantied part and labor rates 4 The date of purchase and proof of Authorized Dealer Installation of a PrecisionPower product must be established by an original sales receipt which must accompany the article being re turned for war ranty work 5 This warranty shall NOTapply to any PrecisionPower product foun
8. d to have the original factory serial number removed or defaced All products received by PrecisionPower for in warranty or out of war ranty repair with their original serial numbers removed or defaced will NOT be repaired and will be returned to sender freight collect Refer to original packaging for the serial number of your component speakers 6 The provisions of this warranty shall not apply to any PrecisionPower product used for a purpose for which it is not designed which has been repaired or altered in any way or which has been con nected installed or adjusted other than in accordance with the instructions furnished in PrecisionPower owner s manual Nor shall this warranty apply to any part which has been subject to misuse neglect or accident 7 PrecisionPower does not authorize any other persons to assume any other liability in connection with its products THIS WARRANTY IS THE ONLY EXPRESS WARRANTY MADE BY PrecisionPower APPLICABLE TO ITS PRODUCTS ANY IMPLIED WARRANTY OR MER CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE APPLICABLE TO PrecisionPower PRODUCTS IS LIMITED IN DURATION TO THE DURATION OF THIS LIMITED WARRANTY PrecisionPower SHALL NOT BE LIABLE FOR THE INCIDENTAL CONSEQUENTIAL OR COM MERCIAL DAMAGES RESULTING FROM THE BREACH OF THIS WRITTEN WARRANTY Some states or provinces do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts so the
9. esn t have RCA outputs don t worry Simply add a set of RCA plugs available at your dealer to your front or rear set of speaker leads see drawing below plug them into the input jacks and push to the IN the 12dB input attenuation switch RI VANCEDO INST RONMENT ATOM IMPLIT H The Advanced Instrumentation Input has trickled down from the 15 000 PrecisionPower2500F1 This circuit completely isolates the chassis ground from the audio circuit of the amplifier and reduces noise radiated into your signal cables by up to 400B This is equivalent to a noise reduction of approximately one hundred times what the noise level would be without this circuitry It provides all the benefits of a true balanced line without the need of any special cables see diagram below This type of input works with any conventional RCAcable NARA whl noise cancels RERE ENQDPLA TE PCX 250 Power Panel 2000 0000000000000 0005 0 0 rower PrecisionPower Designed and Handorafted in the U S A 1 Cooling Plenums Maintain a minimum 2 clearance around cooling plenums for proper amplifier cooling 2 QBASS Control Add more bass to the system by turning this control clock wise to boost the selected QBASS frequency up to 18dB 3 QBASS Remote Port Port to plug in the optional QBASS Plus Remote knob 4 Power amp Ground Connections After connecting the power and ground cables to the PowerLock wire con
10. h the vehicle to the speakers Observe the same precautions for routing these wires that you followed for running the power and remote turn on wires Cut off excess and using wire strippers strip 1 4 inch of insulation Locate the speaker remote turn on PowerLock connector Loosen the outer screws on the underside of the connector Insert the speaker leads into the end Check to be sure you ve maintained proper polarity before securing each wire and plug the PowerLock into the amplifier Speaker POWER OCK Connector Left Speaker negative Left Speaker positive Remote turn on Right Speaker positive Y Right Speaker negative AMPLIFIER PARINI All two channel PCX amplifiers are capable of being bridged into a 4 ohm mono output without switches or bridging modules This feature permits the creation of a mono channel for a subwoofer or center channel Deriving the mono channel is accomplished by using the Left Channel Positive wire L as the positive speaker wire and the Right Channel Negative wire R as the negative speaker wire NOTE It is important that a minimum 4 ohm impedance is observed If the impedance drops below 4 ohms while the amplifier is wired in the bridged configuration the amplifier s protection circuitry AM IV may engage SPLIT There are two sets of RCA jacks on the front end of your amplifier The RCA cables from your source unit go in the set labeled INPUTS If your source unit do
11. his is the case check your speakers and wiring for low impedance and short circuits Thermal Protection engaged The amplifier will turn off and several minutes later will come back on In this case ensure that there is nothing blocking the normal convective airflow of the amplifier No obstruction should be within 2 of the amplifier on all sides NOTE Low battery voltage will cause the amplifier to run warmer and possibly damage the amplifier 14 POLERLOCK CONNECTORS Once you have run both the power and ground wires it s time to connect the cables to the amplifier Cut off excess wire and using wire strippers strip the ends of the power and ground cables approximately 1 4 inch Locate the PowerLock power and ground connector supplied With a small flat bladed screw driver loosen the screws before attempting to insert the cables Insert the wires into the appropriate hole and tighten the screws Check for stray strands of wire which may short out Once the wires are secure the PowerLock may be plugged into the amplifier The Power Ground PowerLock will accommodate 6 gauge wire for the PCX 250 and PCX 280 Power Ground PowerLock Fastening screws Connect to Amplifier TEX CROSSOVER Your New PCX amplifier has a TC X Crossover Total Control X overe 30 4kHz See page 19 for crossover Detent Chart 12dB per octave phase correlat ed crossover built in to provide superior system flexibility without the
12. ier endplate Q BASS PLUS 30Hz 36Hz 44Hz 60Hz Optional QBASS REMOTE This boost control can be mounted in the dash and will supersede the boost control on the endplate PrecisionPowerPCX amplifiers no longer need an optional QPORT to connect multiple QBASS PLUS equipped amplifiers while using one QBASS REMOTE The new QBASS PLUS circuitry in the PCX amplifiers is now positioned before the crossover circuit In doing this PrecisionPower engineers have allowed you to daisy chain your RCAoutput to the next amplifier input causing the first amplifiers Q BASS Remote to become the master control amplifier See your Authorized PrecisionPower Dealer for more information See diagram pg 18 2 20SS0 VER DETEN A A AN Low Pass Frequency Hz 308 High Pass Frequency Hz 3dB CONSRA TALA NONG _ _ a _ And thank you for choosing PrecisionPower audio equipment At PrecisionPower we proudly design engineer and manufacture audio products at our production facilities Our award winning engineering team utilizes innovative technology to consistently deliver Absolutely State of the Art performance sound quality reliability and value This PrecisionPower product reflects our commitment to offer you unparalleled versatility and quality for years of dependable service and listening enjoyment ate a Do not attempt to service PrecisionPower products yourself Performing exploratory surgery o
13. m 2 clearance around cooling plenums for proper amplifier cooling 2 Crossover HP LP FULL Select Switch Adjust this switch to select the HPF LPF FULLfunction for the speaker outputs 3 Crossover Frequency Selector Control Use this control to adjust the crossover frequency for the speaker output See Crossover frequency chart pg 19 4 RCA Inputs Connect the RCA cables from source unit or line driver to these RCAconnectors 5 Gain Control Use this control to match the output level of the source unit to the input of the amplifier 6 12dB Input Attenuation Push this switch IN for high voltage input 4V 12V capability This button pushed IN must be used for speaker level input on common ground head units or for high voltage line drivers PCX 250 280 Control Panel 7 QBASS Frequency Control Buttons 1 and 2 offer the capability of selecting 30 36 44 or 60Hz to boost by the QBASS Control See page 2 8 Output Crossover HP LP FULL Select Switch Adjust this switch to select the HP LP FULL function for the RCAoutputs 9 Output Crossover Frequency Knob Use this control to adjust the crossover frequency for the RCAoutput See Crossover frequency chart pg 19 10 RCA Outputs Left and right RCA outputs provide HP LP Full 30 4KHz to another amplifier 11 Speaker Output Connections Plug the speaker PowerLock connector in here SRE ARE LUME Run the speaker wires from the amplifier location throug
14. n your audio equipment yourself will void the warranty Many parts of your PrecisionPower product are custom built to our specifications Our factory parts are not made available to anyone else nor are they for sale Our goal is to make sure that your PrecisionPower product will always sound as good as the day it was purchased Contact your Authorized PrecisionPower Dealer about obtaining any warranty service through PrecisionPower See Warranty inside back cover CASTANI The extended use of a high powered audio system may result in hearing loss or damage While PrecisionPower systems are capable of Concert Level volumes with incredible accuracy they are also designed for you to enjoy at more reasonable levels all of the sonic subtleties created by musicians Please try to observe all local sound ordinances Three Year Limited U S A Warranty This warranty gives you specific legal rights and you may also have other rights which vary from state to state PrecisionPower warrants its products to be free from defects in materials and workmanship under normal use and service for a period of three 3 years from the date of original purchase when the unit is installed by an Authorized Dealer Non Authorized Dealer installed products carry a one 1 year parts and ninety 90 days labor limited warranty The extent and conditions of Limited Warranty are as follows 1 Authorized Dealer Installed Products PrecisionPower will either repair or repl
15. nector plug it in here 5 Power Indicator A green light indicates that the amplifier power is ON PCX 280 Power Panel The New PCX amplifiers mass has been increased by 2 lbs per linear foot over last year s POWERCLASS amplifiers resulting in far superior heat dissipation The unique heatsink on your PCX amplifier has been designed with fins on the inside of the aluminum extrusion This allows for the transfer of heat from the circuitry to the heatsink fins and out through the vents in the endplates Be sure you have ample space around the amplifier for cooling at least 2 on all sides FORO EE HAIR TRERMAL MANAGEMENT To manage the additional heat associated with higher output capability a thermally controlled fan has been designed into the PCX 280 When the heatsink temperature reaches a pre determined value the fan is activated and cool air is drawn in through the lower intake vents on the endplate This cool air flows below the circuit board through the fan and across the internal fins cooling the heatsink The warm air is then forced out through the upper endplate exhaust vents SHOU LEARN Locate an area near the amplifier s that is metal and clean an area about the size of a quarter to bare metal Inspect the area around and underneath to be sure you won t drill into wires brake or fuel lines etc Drill a pilot hole in the middle of this area Terminate the ground wire with a ring connector and attach it t
16. ng into 4 Ohms 80 x 2 160 You would use the formula in the following way 160W x 2 320W 320W 26 6 Amps Total current draw 12V If the same amplifier is driven into a 2 Ohm stereo or 4 Ohm mono load double i s 4 Ohm RMS rating All POWERCLASS amplifiers will effectively double their power at this load 160W x 2x 2 640W 640W 53 3 Amps Total current draw 12V If you are using more than one amplifier add up the total current draw for all of them and choose the appropriate gauge based on the grand total POLLE IRE CRLCULATOE Recommended Minimum Gauge Total Current Draw Length Of Wire To Be Run inamps Up to 4ft 4to 7ft 7to 10ft 10to 18ft 13 to 16ft 16 to 19ft 19 to 22ft 22 to 28ft 25 50 10 50 65 65 85 85 105 105 125 125 150 150 200 200 250 OONNN A FO NOTE The ground wire must be the same gauge or larger as the power wire SS EAT CESS SOURCE LUNI SH En Sile 1 ea E i Da DEO 2230 LB i DC TAVE EG PEW AMPLIFIER E CHANNEL all PCy AMMPUFIER sp Pai E CHANNEL Woes E a Dio 1 o PRO SUB PRO SLB 250 Up to 12dB of Boost centered at 40Hz with a Q Factor of 2 DAA A gt OBASS Plus PCX 280 Up to 18dB of Boost with selectable center frequency at 30Hz 36Hz 44Hz or 60Hz with a Q Factor of 2 Optional QBASS REMOTE PCX 280 This boost control can be mounted in the dash and will supersede the boost con trol on the amplif
17. o the bare metal using a 8 sheet metal screw and washer or preferably a bolt nut and a star washer not supplied We suggest crimping and soldering this connection After the connection is complete coat the area on both sides with silicone or some similar material to prevent rust from developing on the bare metal If your grand total current draw is over 50 amps or total output power is over 300 watts you should run a separate ground wire beside your power wire from the battery to the amplifier s Keep the ground and power wires as close together as possi ble and use the same gauge wire for both This will ensure that you have a good ground path and may eliminate such potential problems as engine noise and overheated amplifiers LCARRCINO SS TENTA If your grand total current draw is over 100 amps or total output power is over 600 watts you are probably exceeding the capability of your charging system Dimming lights and fluctuating voltage are solid indicators that you need to upgrade your alternator battery or both Keep in mind that your amplifiers simply convert electrical energy to acoustical energy and any electrical deficiency will compromise the performance of your sound system For more information about charging system upgrades see your local authorized PrecisionPower Dealer or call PrecisionPower Technical Support at 1 800 62POWER x 229 ATED MIMO DUTRUT J The ability to run stereo speakers while simultaneously
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