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AMPLIFIER MODELS
DCX 300.4 DCX 600.4
DCX 800.5 DCX 1000.4
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TABLE OF CONTENTS Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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CONGRATULATIONS TM Thank you for choosing PrecisionPower 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, TM and value. This PrecisionPower product reflects our commitment to offer you unparalleled performance and quality for years of dependable service and listening enjoyment. SERVICE TM Do not attempt to service PrecisionPower
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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) TM QBASS Bass Boost (DCX 300.4) TM QBASS Plus Bass Boost (DCX 600.4, DCX 800.5, DCX 1000.4) High Voltage Input Capability with -12dB Attention Switch Gold Plated RCA Input and O
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TM QBASS Up to +18dB @ 40Hz TM QBASS PLUS Up to +18dB Boost @30, 36, 44, or 60Hz Crossovers 12dB/Octave Crossover Frequency 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” 3 DCX 1000.4 29- /8” 10-½” 2-¾” 1 DCX 800.5 28- /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. This fuse
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AMPLIFIER STATUS LEDS 3 4 SHORT PROTECT THERMAL PROTECT POWER 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. Short - This LED illuminates RED on
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QBASS/QBASS PLUS SPECIFICATIONS TM QBASS (DCX 300.4) Up to 18dB of boost centered at 40Hz, with a Q-factor of 2. TM QBASS PLUS (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. TM Optional QBASS REMOTE (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. Small flat blade scr
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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. Wh
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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 TM 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 TM before securing each wire, and plug the PowerLock into the amplifier. Note: The power connector is inserted int
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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 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). We suggest crimping and soldering
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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 1.5 = Total Input Wattage Total Input Wattage = Current Draw (in Amps) Supply Voltage Example: A DCX amplifier has two channels at 250 watts per channel RMS rat
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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 TM approximately 1/4 inch. Locate the PowerLock power and ground connector (supplied). With a small flat blade screwdriver,
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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
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DCX 300.4 FRONT PLATE DIAGRAM 20 19 18 17 16 15 14 13 12 11 10 DCX 300.4 Front Panel SUM INT FREQ FREQ GAIN OUTPUT REAR FRONT REAR EXT R LP LP LP LP LP 30 4K 30 4K 30 4K MIN MAX FULL HP FULL HP FULL HP FULL HP FULL HP FREQ OUTPUTS REAR SOURCE SOURCE QBASS GAIN ATT 0 +12dB MIN MAX L -12dB FR- FR+ REM FL+ FL- RR- RR+ RL+ RL- OUT IN IN FRONT BRIDGED BRIDGED 1 6 7 8 9 2 3 4 5 1. Cooling Plenums: Maintain a minimum 2” clea
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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. Control: Move this detented control in a clockwise rotation
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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 21 20 19 18 17 16 15 14 13 12 11 DCX 600.4 DCX 1000.4 Front Panel SUM INT OUTPUT REAR FRONT FREQ FREQ GAIN REAR EXT R LP LP LP LP LP 30 4K 30 4K MIN MAX 30 4K HP HP FULL HP FULL HP FULL FULL FULL HP FREQ OUTPUTS REAR SOURCE SOURCE GAIN FREQ QBASS ATT L MIN MAX -12dB 2 1 RR- RR+ RL+ RL- FR-
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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. Rear Gain: Use this c
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DCX 800.5 FRONT PLATE DIAGRAM 12 21 20 19 18 17 16 15 14 13 11 10 9 DCX 800.5 Front Panel FREQ GAIN SUM FREQ GAIN INT FREQ GAIN SUB REAR FRONT SUB EXT FULL/LP/HP QBASS FREQ R 30 4K MIN MAX 30 4K MIN MAX FULL/LP/HP 30 4K MIN MAX FULL/LP/HP FULL/LP/HP 2 1 SUB REAR FRONT SOURCE SOURCE SOURCE ATT L - - + + RR- RR+ RL+ RL- FR- FR+ REM FL+ FL- -12dB IN IN IN SUB BRIDGED BR
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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. 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 po
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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 TM 1. Power/Ground PowerLock : After you have securely connected your power and ground wires, plug in the Power/Ground TM PowerLock connector here. TM 2. QBASS REMOTE : Plug in the data cable from the optional TM QBASS REMOTE dash mounted level control here. (The remote TM level control will bypass the amplifier’s on board QBASS control. TM 3. QBASS PLUS : Up to 18dB of ba
