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AMPLIFIER MODELS
DCX 300.2 DCX 500.2
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TABLE OF CONTENTS Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 QBASS PLUS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Spec
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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 New! Advanced Instrumentation Input Stage. New! 24dB/Octave; HP/LP/FULL; 30-4kHz Crossover. New! Independent Line Output Crossover 30-4kHz PWM Power Supply Triple Darlington Output Stage. AP-IV Protection Circuity TM QBASS Bass Boost High Voltage Input Capability with -12dB Attention Switch. Gold Plated RCA Input and Output Connectors. TM PowerLock Speaker and Power Wire Connectors. 2 Yr Warranty; if installed by an Authorized PrecisionPower Dealer. QBASS PLUS SPECIFICATIONS TM QBASS PL
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SPECIFICATIONS Power Ratings MODEL 4 ohm 2 ohm 4 ohm MONO DCX 300.2 2 X 75 2 X 150 1 X 300 DCX 500.2 2 X 125 2 X 250 1 X 500 All power ratings given above are tested at 12.5V; 4 ohms; 20Hz - 200Hz. General Specifications Load Impedance (Stereo) 2–8 ohms Load Impedance (Bridged) 4–8 ohms Input Topology Balanced differential Conversion Efficiency >50% @2 ohms max power Frequency Response 20Hz–20kHz ±0.25dB Linear Bandwidth 10–50kHz ±3dB (300.2) S/N Ratio >110dB Input Sensitivity 150mv - 12 Volts R
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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 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 fuse or circuit breaker. You may also want to add a powe
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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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TOOLS/PARTS FOR INSTALLATION NOTE: TOOLS ARE NOT SUPPLIED. Small flat blade screwdriver Phillips screwdriver (#2 or medium sized) Wire cutters Wire strippers 4 - #6 round head screws, and 1 - #8 sheet metal screw. (or nut, bolt, flat washer, star washer) (see details) 2 - Ring connectors (large enough to accommodate your method of grounding) In-line fuse or circuit breaker Power and ground wire Speaker wire - 12-16 gauge Grommets (sized to work with the power wire you plan to use in your install
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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. When using 16 gauge wire or larger, run the speaker wires from the amplifier location through 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 TM speaker/remote turn-on PowerLock connec
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Note: The power connector is inserted into the amplifier with the wire clamping screws in the up position as shown below. 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 sh
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You should also check the condition and current capacity of the stock battery negative cable and connections, and replace or upgrade as necessary. 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 you TM TM local authorized PrecisionPower Dealer or call PrecisionPower Technical Support at 1-800-62POWER x2033. CURRENT D
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If the same amplifier is driven into a 2 ohm stereo or 4 ohm mono load, double it’s 4 ohm RMS rating. All DCX amplifiers will effectively double their power at this load. 500W X 1.5 X2 = 1500 watts 1500W = 125 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. POWER WIRE SIZE A minimum of 8 gauge or a maximum of 4 gauge wire is recommended dependent on the application. The
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POWERLOCK 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, loosen the screws before attempting to insert the cable wires. Insert the wires into the appropriate hole, and tighten the screws. Once the wires are TM secure, the Pow
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DCX 300.2, DCX 500.2 FRONT PLATE DIAGRAM 12 11 DCX 300.2 DCX 500.2 Front Panel R R BRIDGE - + OUTPUT XOVER XOVER GAIN FREQ QBASS ATT LP LP L 30 40k 30 40k MIN MAX L R- R+ REM L+ L- 21 -12dB OUTPUT FREQ FULL HP INTPUT FREQ FULL HP 1 2 3 4 5 6 7 8 9 10 1. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums for proper amplifier cooling. TM 2. Speaker/Remote Connector: Plug in the PowerLock connector here. 3. Output Xover Freq. Control: Use this con
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DCX 300.2, DCX 500.2 END PLATE DIAGRAM DCX 300.2 DCX 500.2 End Panel QBASS QBASS REMOTE +16 0 1 2 3 4 1. Cooling Plenums: Maintain a minimum 2” clearance around cooling plenums for proper amplifier cooling. TM 2. Power/Ground PowerLock : After you have securely connected your power and ground wires, plug in the Power/Ground TM PowerLock connector here. TM 3. QBASS REMOTE : Plug in the data cable from the optional TM QBASS REMOTE dash mounted level control here. (The remote TM level contro
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INPUTS 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 doesn’t have RCA outputs, then 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 in the -12dB input attenuation switch. SOURCE Headunit eject 1 2 3 4 Trk 1 5 6 7 8 BASS TREBLE BALANCE TRACK PPI MAR KET ING DPT VOLUME LEFT RIGHT FOWAR
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QBASS PLUS/QBASS REMOTE On DCX 300.2, and DCX 500.2 amplifiers, we’ve taken bass control TM TM to a higher level with QBASS PLUS . The two QBASS 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 TM rear end plate you will find the QBASS level control and plug-in for TM an optional QBASS REMOTE dash mounted level control. Adjust the level control clockwise for up to +18dB of boost at your selected frequ
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TC-X CROSSOVER Your new DCX amplifier has a TC-X Crossover (Total Control X- ® over ) 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. You would choose low pass (middle position of switch) to use this amplifie
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CROSSOVER DETENT CHART Low Pass High Pass Detent # Frequency (Hz) Frequency (Hz) @ -3dB @ -3dB 1 28 52 2 28 52 3 30 52 4 30 56 5 30 56 6 32 60 7 34 64 8 36 72 9 38 76 10 42 80 11 46 88 12 50 92 13 52 100 14 54 116 15 60 132 16 66 148 17 76 168 18 88 192 19 100 216 20 116 244 21 136 284 22 144 348 23 168 404 24 198 468 25 240 512 26 286 564 27 310 624 28 340 700 29 380 800 30 424 932 31 484 1036 32 576 1144 33 632 1300 34 748 1504 35 932 1812 36 1076 2196 37 1428 2840 38 1700 4116 39 2436 4540 40
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ADJUSTING INPUT GAIN 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
