AMPLIFIER MODELS DCX 300.4 DCX 800.5 DCX 600.4 DCX 1000.
TABLE OF CONTENTS Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONGRATULATIONS Thank you for choosing PrecisionPowerTM audio equipment. Designed and engineered in the USA, this product combines innovative technology with the finest materials to consistently deliver Absolutely State of the Art™ performance, sound quality, reliability, and value. This PrecisionPowerTM product reflects our commitment to offer you unparalleled performance and quality for years of dependable service and listening enjoyment.
FEATURES Advanced Instrumentation Input Stage TC-X Crossover 12dB/Octave; HP/LP/FULL; 30-4kHz Crossover Adaptive PWM Power Supply (DCX 300.4, DCX 600.4, DCX 800.5) AP-IV Protection Circuity Fully Regulated PWM Power Supply (DCX 1000.4) Fully Complementary Darlington Output Stage Forced Air Thermal Management (DCX 1000.4) QBASSTM Bass Boost (DCX 300.4) QBASS PlusTM Bass Boost (DCX 600.4, DCX 800.5, DCX 1000.
QBASSTM QBASS PLUSTM Up to +18dB @ 40Hz Up to +18dB Boost @30, 36, 44, or 60Hz 12dB/Octave 30-4kHz DCX 300.4 2 Amps DCX 600.4 2.5 Amps DCX 1000.4 3 Amps DCX 800.5 2.5 Amps Crossovers Crossover Frequency Idle Current: 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” 10-½” 2-¾” DCX 800.5 28-1/8” 10-½” 2-¾” FUSE REQUIREMENTS You will need to install an in-line fuse or circuit breaker in the power wire within 18” of the battery.
AMPLIFIER STATUS LEDS 3 SHORT PROTECT POWER 4 THERMAL PROTECT CLIP OUT 1 2 The LEDs provide the following indications: 1. Power - This LED illuminates RED when the amplifier power is turned on with the remote input (output muted). After a short time delay this LED will turn GREEN (amplifier ready). 2. Clip Output - This LED illuminates RED on the peaks of the output signal when the peaks are too high. This clipping causes audible distortion in the speakers. 3.
QBASS/QBASS PLUS SPECIFICATIONS QBASSTM (DCX 300.4) Up to 18dB of boost centered at 40Hz, with a Q-factor of 2. QBASS PLUSTM (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-factor of 2. Optional QBASS REMOTETM (DCX 600.4, 1000.4, 800.5) This boost control can be mounted in the dash and will supersede the boost control on the amplifier endplate. TOOLS/PARTS FOR INSTALLATION NOTE: TOOLS ARE NOT SUPPLIED.
WIRING Before beginning, disconnect the negative (-) terminal of the battery prior to connecting the amplifier to the positive (+) 12V terminal to prevent a short to ground and potential damage to wiring and equipment. Some vehicle radios have an anti-theft feature where when the radio is removed from 12V the radio will no longer function and must be code reset. Note: The cables running from the battery to the rear of the car should be installed on the side of the car opposite to the antenna.
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 PowerLockTM 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 PowerLockTM into the amplifier.
GROUND WIRING Locate an area near the amplifier(s) that is metal and clean an area about the size of a quarter down to bare metal. Inspect the area around and underneath to be sure you will not 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 to the bare metal using a #8 sheet metal screw and washer or preferable, a bolt, nut and a star washer. (not supplied).
CURRENT DRAW The following is a basic formula to be used as a guide to determine current draw. Your new 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 improve the current transfer of your system. Do NOT use smaller wire gauge. Total RMS output X 1.
POWER 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 power wire. POWER LOCK CONNECTORS Once you have run both the power and ground wires, then 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 PowerLockTM power and ground connector (supplied).
modules. This feature permits the creation of a mono channel for a suitable 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 may engage.
DCX 300.4 FRONT PLATE DIAGRAM DCX 300.4 Front Panel 20 19 18 17 FREQ 30 FULL SUM REAR LP LP HP 16 15 14 FREQ GAIN LP 30 FULL HP 4K HP FULL 12 INT EXT LP 4K OUTPUTS 13 MIN RR+ RL+ 1 2 RL- FR- FR+ REM FL+ REAR FRONT LP HP FULL SOURCE 0 BRIDGED OUTPUT 10 30 FULL QBASS RR- R MAX REAR SOURCE 11 +12dB FL- ATT -12dB BRIDGED 3 4 5 4K HP FREQ GAIN L MIN MAX OUT IN IN FRONT 6 7 8 9 1.
to use the internal signal path from the front crossover for the rear input, or the EXT position to use the external rear RCA input. 13. Source HP/LP/FULL Switch: Select the desired setting. HP/LP/FULL for the internal signal from the front channel to the rear channel when not using an external rear RCA input. 14. Rear Gain: Use this control to match the output level of the head unit to the rear channel of the amplifier. 15. Rear Freq.
2. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums for proper amplifier cooling. DCX 600.4 AND DCX 1000.4 FRONT PLATE DIAGRAM DCX 600.4 21 DCX 1000.
setting. HP/LP/FULL for the speaker output signal of the front channel. 13. Rear Source INT/EXT Switch: Select the INT position (switch in) if you want to use the internal signal path from the front crossover for the rear input, or the EXT position (switch out) to use the external rear RCA input. 14. Rear HP/LP/FULL Switch: Select the desired setting. HP/LP/FULL for the internal signal from the front channel to the rear channel when not using an external rear RCA input. 15.
DCX 800.5 FRONT PLATE DIAGRAM 12 DCX 800.5 Front Panel 21 20 19 18 FREQ GAIN SUM SUB 30 FULL/LP/HP 4K MIN 17 16 15 FREQ GAIN 30 MAX 4K FULL/LP/HP SUB MIN REAR SOURCE 14 13 INT EXT MAX 11 10 FREQ GAIN 9 SUB REAR FRONT FULL/LP/HP FULL/LP/HP 30 MIN R QBASS FREQ MAX 2 FRONT SOURCE 4K 1 SOURCE ATT - - + SUB 1 2 + RR- RR+ RL+ BRIDGED RL- FR- FR+ REM FL+ FL- -12dB IN IN IN 5 6 7 8 BRIDGED 3 4 L 1.
12. Front HP/LP/FULL Switch: Select the desired crossover setting. HP/LP/FULL for the speaker output signal of the front channel. 13. Rear Input INT/EXT Switch: Select the INT position if you want to use the internal signal path from the front crossover for the rear input, or the EXT position to use the external rear RCA input. 14.
DCX 600.4, DCX 800.5, DCX 1000.4 END PLATE DIAGRAM 1 2 3 4 DCX 600.4, 800.5, 1000.4 Rear Panel QBASS QBASS REMOTE 0 +16 1. Power/Ground PowerLockTM: After you have securely connected your power and ground wires, plug in the Power/Ground PowerLockTM connector here. 2. QBASS REMOTETM: Plug in the data cable from the optional QBASS REMOTETM dash mounted level control here. (The remote level control will bypass the amplifier’s on board QBASSTM control. 3.
DCX 300.4, 600.4, 1000.
DCX 800.
ADVANCED INSTRUMENTATION INPUT The Advanced Instrumentation Input has been incorporated from the legendary PrecisionPowerTM 2500F1. 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 40dB. This is equivalent to a noise reduction of approximately one hundred times what the noise level would be without this circuitry.
QBASS PLUS On DCX 600.4, DCX 800.5, and DCX 1000.4 amplifiers, we’ve taken bass control to a higher level with QBASS PLUSTM. The two QBASSTM switches (labeled 1 and 2) on the front end of the amplifier allow you to select one of four frequency centers 30Hz, 36Hz, 44Hz and 60Hz. On the rear end plate you will find the QBASSTM level control and plug-in for an optional QBASS REMOTETM dash mounted level control. Adjust the level control clockwise for up to +18dB of boost at your selected frequency.
Your new DCX amplifier has a TC-X Crossover (Total Control Xover®) 30Hz-4kHz (see this guide for Crossover Chart).12dB per octave phase correlated crossover built-in to provide superior system flexibility without the added expense and installation of an outboard crossover. The speaker outputs of your amplifier are high pass, low pass, or all-pass according to the HP/LP/FULL switch on the front endplate.
CROSSOVER DETENT CHART Detent # 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 Low Pass Frequency (Hz) @ -3dB 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 1700 2436 2830 2980 25 High Pass Frequency (Hz) @ -3dB 52 52 52 56 56 60 64 72 76 80 88 92 100 116 132 148 168 192 216 244 284 348 404 468 512 564 624 700 800 932 1036 1144 1300 1504 1812 2196 2840 41
INPUT COMBINE Your multi-channel DCX amplifier can use both front and rear outputs from your head unit to maintain the ability to fade front to rear, or you can run a single set of RCAs to the front inputs and push in the Rear Input INT/EXT switch on the amplifier endplate to route the front signal to the rear channels as well. ADJUSTING INPUT GAIN 1. Adjust all amplifier input gain controls to just above minimum sensitivity (fully counterclockwise). 2.
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 end-plate exhaust vents. AP-IV PROTECTION CIRCUIT Short Circuit Protection engaged: The DCX amplifiers will turn off and try to come back on immediately (the Short RED LED will illuminate). The amplifier will cycle like this indefinitely with “blips” of sound each time.
TROUBLESHOOTING NO SOUND Is the LED illuminated? YES NO Check Power and Remote turn-on wire for voltage. Make sure the ground wire is secure. STILL NO SOUND See your Authorized PrecisionPowerTM Dealer or call 1-800-62POWER. SOUND IN ONE CHANNEL ONLY Reverse the 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.
LIMITED TWO YEAR CONSUMER WARRANTY: Directed Electronics, Inc. promises to the original purchaser, to replace this product should it prove to be defective in workmanship or material under normal use, for a period of two years from the date of purchase by the dealer as indicated by the date code marking of the product PROVIDED the product was installed by an authorized Directed dealer.
