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Table of contents for the manual
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Page 1
AMPLIFIER MODELS DCX 300.4 DCX 600.4 DCX 800.5 DCX 1000.4[...]
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T ABLE OF CONTENTS Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Ser vice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 F eatures . . . . . . . . . . . . .[...]
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Page 3
CONGRA TULA TIONS Thank you f or choosing Precision P o wer TM audio equipment. Designed and engineered in the USA, this product combines innov ativ e technology with the finest materials to consistently deliver Absolutely State of the Ar t ™ perf or mance, sound quality , reliability , and v alue. This Precision P o wer TM product reflects our c[...]
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Page 4
FEA TURES Advanced Instrumentation Input Stage TC-X Crosso ver 12dB/Octav e; HP/LP/FULL; 30-4kHz Crossover Adaptive PWM P ower Supply (DCX 300.4, DCX 600.4, DCX 800.5) AP-IV Protection Circuity Fully Regulated PWM P o wer Supply (DCX 1000.4) Fully Complementar y Darlington Output Stage F orced Air Thermal Management ( DCX 1000.4) QB ASS TM Bass Boo[...]
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Page 5
QB ASS TM Up to +18dB @ 40Hz QB ASS PLUS TM Up to +18dB Boost @30, 36, 44, or 60Hz Crossov ers 12dB/Octav e Crossov er F requency 30-4kHz Idle Current: DCX 300.4 2 Amps DCX 600.4 2.5 Amps DCX 1000.4 3 Amps DCX 800.5 2.5 Amps Dimensions Length Width Height DCX 300.4 21-½” 10-½” 2-¾” DCX 600.4 24-¾” 10-½” 2-¾” DCX 1000.4 29- 3 /8 ?[...]
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5 AMPLIFIER ST A TUS LEDS The LEDs provide the f ollowing indications: 1. P ower - This LED illuminates RED when the amplifier power is tur ned on with the remote input (output muted). After a shor t time dela y this LED will tur n GREEN (amplifier ready). 2. Clip Output - This LED illuminates RED on the peaks of the output signal when the peaks ar[...]
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QB ASS/QBASS PLUS SPECIFICA TIONS QB ASS TM ( DCX 300.4 ) Up to 18dB of boost centered at 40Hz, with a Q-f actor of 2. QB ASS PLUS TM ( DCX 600.4, 1000.4, 800.5 ) Up to 18dB of boost with selectable center frequency at 30Hz, 36Hz, 44Hz or 60Hz, with a Q-f actor of 2. Optional QB ASS REMO TE TM ( DCX 600.4, 1000.4, 800.5 ) This boost control can be [...]
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Page 8
WIRING Bef ore beginning, disconnect the negativ e (-) ter minal of the batter y prior to connecting the amplifier to the positive (+) 12V terminal to pre v ent a shor t to ground and potential damage to wiring and equipment. Some vehicle r adios hav e an anti-theft feature where when the radio is remo v ed from 12V the r adio will no longer functi[...]
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Page 9
same precautions f or routing these wires that you f ollow ed f or running the power and remote turn on wires. Cut off e xcess and, using wire strippers, strip 1/4-inch of insulation. Locate the speaker/remote turn-on P ower Loc k TM connector . Loosen the outer screws on the underside of the connector . Inser t the speak er leads into the end. Che[...]
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GROUND WIRING Locate an area near the amplifier(s) that is metal and clean an area about the size of a quar ter down to bare metal. Inspect the area around and under neath to be sure you will not drill into wires, brak e or fuel lines, etc. Dr ill a pilot hole in the middle of this area. T er minate the ground wire with a ring connector and attach [...]
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Page 11
CURRENT DRA W The f ollowing is a basic f or mula to be used as a guide to deter mine current dra w . Y our ne w DCX 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 improv e the current transf er of your system. Do NO T use smaller wire gauge. T otal RMS output[...]
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Page 12
PO WER WIRE SIZE A minimum of 8 gauge or a maximum of 4 gauge wire is recommended dependent on the application. The ground wire must be the same gauge as the po wer wire. PO WER LOCK CONNECT ORS Once you ha ve run both the pow er and ground wires, then connect the cables to the amplifier . Cut off excess wire , and using wire strippers, strip the e[...]
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modules. This feature permits the creation of a mono channel for a suitable subw oof er or center channel. Der iving the mono channel is accomplished by using the Left Channel P ositive wire (L+) as the positiv e speaker wire and the Right Channel Negativ e wire (R-) as the negativ e speaker wire . Note: It is impor tant that a minimum 4 ohm impeda[...]
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Page 14
DCX 300.4 FRONT PLA TE DIA GRAM 1. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums f or proper amplifier cooling. 2. Rear Speaker Connector: Plug in the P ower Loc k TM connector here. 3. Front Speaker/Remote Connector: Plug in the P ower Loc k TM connector here. 4. QB ASS TM Level Contr ol: Controls bass boost, centered a[...]
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Page 15
to use the inter nal signal path from the front crossov er f or the rear input, or the EXT position to use the e xter nal rear RCA input. 13. Source HP/LP/FULL Switc h: Select the desired setting. HP/LP/FULL f or the internal signal from the front channel to the rear channel when not using an e xter nal rear RCA input. 14. Rear Gain: Use this contr[...]
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Page 16
2. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums f or proper amplifier cooling. DCX 600.4 AND DCX 1000.4 FRONT PLA TE DIA GRAM 1. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums f or proper amplifier cooling. 2. Rear Speaker Connector: Plug in the P ower Loc k TM connector here. 3. Front Speaker[...]
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Page 17
setting. HP/LP/FULL for the speak er output signal of the front channel. 13. Rear Sour ce INT/EXT Switch: Select the INT position (s witch in) if you w ant to use the inter nal signal path from the front crossov er f or the rear input, or the EXT position (s witch out) to use the e xter nal rear RCA input. 14. Rear HP/LP/FULL Switch: Select the des[...]
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Page 18
DCX 800.5 FRONT PLA TE DIA GRAM 1. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums f or proper amplifier cooling. 2. Sub Speaker Connector: Plug in the P ower Loc k TM connector here. 3. Rear Speaker Connector: Plug in the P ower Loc k TM connector here. 4. Front Speaker/Remote Connector: Plug in the P ower Loc k TM connec[...]
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Page 19
12. Front HP/LP/FULL Switc h: Select the desired crossov er setting. HP/LP/FULL for the speak er output signal of the front channel. 13. Rear Input INT/EXT Switch: Select the INT position if you w ant to use the inter nal signal path from the front crossov er f or the rear input, or the EXT position to use the e xter nal rear RCA input. 14. Rear So[...]
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Page 20
DCX 600.4, DCX 800.5, DCX 1000.4 END PLA TE DIA GRAM 1. P ower/Gr ound Po w e r Lock TM : After you ha ve securely connected your po wer and ground wires, plug in the P ower/Ground Po w e r Lock TM connector here. 2. QB ASS REMO TE TM : Plug in the data cable from the optional QB ASS REMO TE TM dash mounted le v el control here. (The remote le v el[...]
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Page 21
DCX 300.4, 600.4, 1000.4 BLOCK DIA GRAM INPUT A TTENUA TION INPUT A TTENUATION 20[...]
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Page 22
DCX 800.5 BLOCK DIA GRAM 21[...]
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AD V ANCED INSTRUMENT A TION INPUT The Adv anced Instrumentation Input has been incor porated from the legendar y Precision P ower TM 2500F1 . This circuit completely isolates the chassis ground from the audio circuit of the amplifier and reduces noise radiated into y our signal cables b y up to 40dB. This is equiv alent to a noise reduction of app[...]
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QB ASS PLUS On DCX 600.4 , DCX 800.5 , and DCX 1000.4 amplifiers, w e’ve tak en bass control to a higher le v el with QB ASS PLUS TM . The two QB ASS TM s witches (labeled 1 and 2) on the front end of the amplifier allow y ou to select one of four frequency centers 30Hz, 36Hz, 44Hz and 60Hz. On the rear end plate you will find the QB ASS TM le v [...]
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Page 25
Y our ne w DCX amplifier has a TC-X Crossov er (T otal Control X- over ® ) 30Hz-4kHz (see this guide for Crosso ver Chart).12dB per octav e phase correlated crossov er built-in to provide superior system fle xibility without the added e xpense and installation of an outboard crossov er . The speaker outputs of y our amplifier are high pass, lo w p[...]
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25 CROSSO VER DETENT CHART Detent # Low P ass F requency (Hz) @ -3dB High P ass F requency (Hz) @ -3dB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 28 28 30 30 30 32 34 36 38 42 46 50 52 54 60 66 76 88 100 116 136 144 168 198 240 286 310 340 380 424 484 576 632 748 932 1076 1428 1[...]
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INPUT COMBINE Y our m ulti-channel DCX amplifier can use both front and rear outputs from your head unit to maintain the ability to f ade front to rear , or y ou can r un a single set of RCAs to the front inputs and push in the Rear Input INT/EXT s witch on the amplifier endplate to route the front signal to the rear channels as well. ADJUSTING INP[...]
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through the low er intake v ents on the endplate. This cool air flows below the circuit board, through the f an and across the inter nal fins, cooling the heatsink. The warm air is then forced out through the upper end-plate e xhaust v ents. AP-IV PRO TECTION CIRCUIT Shor t Circuit Protection engaged: The DCX amplifiers will tur n off and tr y to c[...]
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28 TROUBLESHOO TING NO SOUND Is the LED illuminated? YES NO Check P ower and Remote tur n-on wire f or voltage . Make sure the g round wire is secure. STILL NO SOUND See your A uthor ized Precision P ower TM Dealer or call 1-800-62PO WER. SOUND IN ONE CHANNEL ONL Y Re verse the left and right speakers b y unplugging the speaker connector , turning [...]
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LIMITED TWO YEAR CONSUMER W ARRANTY : Directed Electronics, Inc. promises to the or iginal purchaser , to replace this product should it prov e to be defectiv e in workmanship or material under nor mal use, f or a period of two y ears from the date of purchase b y the dealer as indicated by the date code marking of the product PRO VIDED the product[...]