Precision Power DCX 6004 User Manual

AMPLIFIER MODELS  
DCX 300.4  
DCX 600.4  
DCX 800.5  
DCX 1000.4  
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 Artperformance, 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.  
SERVICE  
Do not attempt to service PrecisionPowerTM products yourself.  
Performing maintenance on your audio equipment will void the  
warranty. Many parts of the PrecisionPowerTM 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 PrecisionPowerTM product will always sound as  
good as the day it was purchased. Contact your Authorized  
PrecisionPowerTM Dealer about obtaining any warranty service  
through PrecisionPowerTM. (See the Warranty on the outside of the  
back cover).  
CAUTION  
Extended use of a high powered audio system may result in hearing  
loss or damage. While PrecisionPowerTM 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 observe all local sound  
ordinances.  
2
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 1000.4)  
High Voltage Input Capability with -12dB Attention Switch  
Gold Plated RCA Input and Output Connectors  
PowerLockTM Speaker and Power Wire Connectors  
Mixed Mono/Stereo Operation  
2 Yr Warranty if installed by an Authorized PrecisionPower Dealer  
SPECIFICATIONS  
Power Ratings  
MODEL  
4ohm STEREO  
4 X 50  
4 X 75  
4 X 125  
4 X 50  
2ohm STEREO  
4 X 75  
4 X 150  
4 X 250  
4 X 100  
4ohm MONO  
2 X 150  
2 X 300  
2 X 500  
2 X 200  
DCX 300.4  
DCX 600.4  
DCX 1000.4  
DCX 800.5  
4ohm MONO  
1 X 200  
2ohm MONO  
1 X 400  
5/Ch.  
All power ratings given above are tested at 12.5V; 4 ohms; 20Hz - 20kHz.  
General Specifications  
Frequency Response  
Power Bandwidth  
Total Harmonic Distortion  
S/N Ratio  
20Hz - 20kHz  
10Hz - 50 kHz  
>0.02%  
<110dB  
Input Topology  
Input Sensitivity  
Instrumentation  
150mV - 12 Volts RMS  
(with -12dB pad)  
40 kOhms  
2 - 8 Ohms  
4 - 8 Ohms  
11 - 16 Volts  
>500  
Input Impedance  
Load Impedance (stereo)  
Load Impedance (bridged)  
Supply Voltage  
Damping Factor  
Slew Rate  
>20V/µs  
3
QBASSTM  
Up to +18dB @ 40Hz  
Up to +18dB Boost  
@30, 36, 44, or 60Hz  
12dB/Octave  
QBASS PLUSTM  
Crossovers  
Crossover Frequency  
Idle Current:  
30-4kHz  
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  
10-½”  
Height  
2-¾”  
DCX 300.4  
DCX 600.4  
DCX 1000.4  
DCX 800.5  
21-½”  
24-¾”  
29-3/8”  
28-1/8”  
10-½”  
10-½”  
10-½”  
2-¾”  
2-¾”  
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 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 power  
distribution block near your amplifiers to distribute large gauge  
power cable to multiple amplifiers.  
Amp  
Fuse  
50A  
DCX 300.4  
DCX 600.4  
DCX 1000.4  
DCX 800.5  
70A  
100A  
100A  
4
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 a short condition. The  
amplifier will turn off and try to turn back on.  
4. Thermal - This LED illuminates RED on a thermal condition. The  
amplifier will turn off and turn back on in a minute or so.  
Note: Read the AP-IV Protection Circuit section for additional  
information regarding Short and Thermal protection.  
5
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.  
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  
installation)  
Tube of silicone sealant  
6
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.  
When using 16 gauge wire or larger, run the speaker wires from the  
amplifier location through the vehicle to the speakers. Observe the  
7
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.  
Note: The power connector is inserted into the amplifier with  
the wire clamping screws in the up position as shown below.  
For the rear channels, locate the four terminal speaker PowerLockTM  
connector. (For DCX 800.5, the 5th channel also uses a four terminal  
PowerLockTM connector.) On 4 and 5 channel DCX amplifiers, all  
speaker PowerLockTM plug into the amplifier with the screws facing  
up. Loosen the screws on the top of the blocks and insert the  
stripped ends of the speaker wires into the end. Double check  
polarity, secure each wire by tightening the screws, and plug the  
PowerLockTM connector into the amplifier with the screws on top.  
8
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 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  
80 amps (or total power is over 500 watts). Keep the ground and  
power wires as close together as possible, 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.  
CHARGING SYSTEM  
If your 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.  
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  
local authorized PrecisionPowerTM Dealer or call PrecisionPowerTM  
Technical Support at 1-800-62POWER x2033.  
9
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 rating into 4 ohms (250X2 = 500 watts).  
You would use the formula in the following way:  
500 W X 1.5 = 750 watts  
750W  
12V  
= 62.5 Amps total current draw  
If the same amplifier is driven into a 2 ohm stereo or 4 ohm mono  
load, double its 4 ohm RMS rating. All DCX amplifiers will effectively  
double their power at this load.  
500W X 1.5 X2 = 1500 watts  
1500W  
12V  
= 125 Amps total current draw  
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.  
10  
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). 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  
secure, the PowerLockTM may be plugged into the amplifier. The  
Power/Ground PowerLockTM will accommodate 6 gauge wire for the  
DCX 300.2 and DCX 600.4, and 4 gauge wire for the DCX 800.5 and  
DCX 1000.4.  
AMPLIFIER BRIDGING  
Pairs of channels in DCX multi-channel amplifiers are capable of  
being bridged into a 4 ohm mono output without switches or bridging  
11  
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.  
Note: This does not apply to the DCX 800.5 sub channel, which can  
drive a 2 ohm load safely.  
MIXED MONO OUTPUT  
The ability to run stereo speakers while simultaneously 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.  
12  
DCX 300.4 FRONT PLATE DIAGRAM  
20 19 18  
17 16  
15 14  
13  
12  
11 10  
DCX 300.4  
Front Panel  
SUM  
REAR  
INT  
EXT  
FREQ  
FREQ  
30 4K  
GAIN  
OUTPUT  
REAR  
FRONT  
R
LP  
LP  
LP  
LP  
LP  
30 4K  
30 4K  
MIN MAX  
REAR  
FULL  
HP  
FULL  
HP  
FULL  
HP  
FULL  
HP  
FULL  
GAIN  
HP  
FREQ  
OUTPUTS  
SOURCE  
SOURCE  
QBASS  
ATT  
-12dB  
0
+12dB  
MIN MAX  
FRONT  
L
RR-  
RR+  
BRIDGED  
RL+  
RL-  
FR-  
FR+  
REM  
FL+  
FL-  
OUT  
IN  
IN  
BRIDGED  
1
6
7
8
9
2
3
4
5
1. Cooling Plenums: Maintain a minimum 2” clearance around  
cooling plenums for proper amplifier cooling.  
2. Rear Speaker Connector: Plug in the PowerLockTM connector  
here.  
3. Front Speaker/Remote Connector: Plug in the PowerLockTM  
connector here.  
4. QBASSTM Level Control: Controls bass boost, centered at 40Hz  
with up to 18dB of boost.  
5. -12dB Attenuation Switch: Push this switch ‘IN’ for high voltage  
input (4V-12V) capability. This button must be pushed ‘IN’ for use  
with speaker level input on common ground head-units or for high  
voltage line drivers.  
6. RCA Output: RCA outputs provide HP/LP/FULL 30-4kHz signal  
to another amplifier.  
7. Rear Inputs: Plug in the rear RCA leads from your source here.  
8. Front Inputs: Plug in the front RCA leads from your source here.  
9. Front Gain: Use this control to match the output level of the  
source unit to the front channel of the amplifier.  
10. Front Freq. Control: Move this detented control in a clockwise  
direction to adjust the front crossover frequency from 30Hz to4 kHz.  
(see Crossover Frequency chart in this manual).  
11. Front HP/LP/FULL Switch: Select the desired crossover  
setting. HP/LP/FULL for the speaker output signal of the front  
channel.  
12. Rear Input INT/EXT Switch: Select the INT position if you want  
13  
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 to adjust the rear crossover frequency from 30Hz to 4kHz.  
(See the Crossover Frequency chart in this manual).  
16. Rear HP/LP/FULL Switch: Select the desired crossover setting,  
HP/LP/FULL for the speaker output signal of the rear channel.  
17. Source Sum/Rear Switch: Select the SUM position if you want  
to use the RCA output signal summed from the front and rear audio  
channels, or the REAR position to select the input off of the rear  
channel only for bandpass capability.  
18. Source HP/LP/FULL Switch: Select the desired crossover  
setting. HP/LP/FULL for the output signal of the rear channel when  
not using the SUM source input.  
19. Output Freq. Control: Use this control to adjust the rear high  
pass crossover frequency from 30Hz to 4kHz. (See the Crossover  
Frequency chart in this manual).  
20. Output HP/LP/FULL Switch: Select the desired crossover  
setting. HP/LP/FULL for the signal of the output RCA.  
DCX 300.4 END PLATE DIAGRAM  
1
2
DCX 300.4  
Rear Panel  
1. Power/Ground PowerLockTM: After you have securely  
connected your power and ground wires, plug in the Power/Ground  
PowerLockTM connector here.  
14  
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  
INT  
EXT  
SUM  
REAR  
OUTPUT  
REAR  
FRONT  
FREQ  
30 4K  
GAIN  
FREQ  
R
LP  
LP  
LP  
LP  
LP  
MIN MAX  
REAR  
30 4K  
30 4K  
HP  
FULL  
HP  
FULL  
HP  
FULL  
HP  
FULL  
FULL  
GAIN  
HP  
FREQ  
OUTPUTS  
SOURCE  
SOURCE  
FREQ QBASS ATT  
L
MIN MAX  
FRONT  
-12dB  
2
1
RR-  
RR+  
BRIDGED  
RL+  
RL-  
FR-  
FR+  
REM  
FL+  
FL-  
OUT  
IN  
IN  
BRIDGED  
1
7
8
9
10  
2
3
4
5
6
1. Cooling Plenums: Maintain a minimum 2” clearance around  
cooling plenums for proper amplifier cooling.  
2. Rear Speaker Connector: Plug in the PowerLockTM connector  
here.  
3. Front Speaker/Remote Connector: Plug in the PowerLockTM  
connector here.  
4 & 5. QBASSTM 1 and QBASSTM 2 Freq.: Use these switches,  
QBASSTM 1 and QBASSTM 2 to program the QBASS PLUSTM circuit  
frequency.  
6. -12dB Attenuation Switch: Push this switch ‘IN’ for high voltage  
input (4V-12V) capability. This button must be pushed ‘IN’ for use  
with speaker level input on common ground head-units or for high  
voltage line drivers.  
7. RCA Output: RCA outputs provide HP/LP/FULL 30-4kHz signal  
to another amplifier.  
8. Rear Inputs: Plug in the rear RCA leads from your source here.  
9. Front Inputs: Plug in the front RCA leads from your source input  
here.  
10. Front Gain: Use this control to match the output level of the  
source unit to the front channel of the amplifier.  
11. Front Freq. Control: Move this detented control in a clockwise  
direction to adjust the front crossover frequency from 30Hz to4kHz.  
12. Front HP/LP/FULL Switch: Select the desired crossover  
15  
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 control to match the output level of the head  
unit to the rear channel of the amplifier.  
16. Rear Freq. Control: Move this detented control in a clockwise  
rotation to adjust the rear crossover frequency from 30Hz to 4kHz.  
17. Rear HP/LP/FULL Switch: Select the desired crossover setting,  
HP/LP/FULL for the speaker output signal of the rear channel.  
18. Source Sum/Rear Switch: Select the SUM (switch in position)  
if you want to use the RCA output information summed from the  
front and rear audio channels. Select the REAR (switch out position)  
to select the input off of the rear channel, providing bandpass  
capability.  
19. Output Source HP/LP/FULL Switch: Select the desired  
crossover setting, HP/LP/FULL for the RCA output signal.  
20. Output Crossover Freq. Control: Use this control to adjust the  
output crossover frequency from 30Hz to4kHz.  
21. Output Crossover HP/LP/FULL Switch: Select the desired  
crossover setting, HP/LP/FULL for the internal output signal of the  
RCA output.  
Note: See the next section for the rear panel view of this endplate.  
16  
DCX 800.5 FRONT PLATE DIAGRAM  
12  
21 20 19 18  
17 16 15 14 13  
11 10  
9
DCX 800.5  
Front Panel  
INT  
EXT  
FREQ  
30 4K  
GAIN  
SUM  
SUB  
FREQ  
30 4K  
GAIN  
FREQ  
30 4K  
SUB  
REAR  
FRONT  
GAIN  
FULL/LP/HP  
QBASS FREQ  
R
MIN MAX  
MIN MAX  
MIN MAX  
SOURCE  
FULL/LP/HP  
FRONT  
FULL/LP/HP  
FULL/LP/HP  
2
1
SUB  
REAR  
SOURCE  
SOURCE  
ATT  
L
-12dB  
-
-
+
+
RR-  
RR+  
BRIDGED  
RL+  
RL-  
FR-  
FR+  
REM  
FL+  
FL-  
IN  
IN  
IN  
SUB  
BRIDGED  
1
2
3
4
5
6
7
8
1. Cooling Plenums: Maintain a minimum 2” clearance around  
cooling plenums for proper amplifier cooling.  
2. Sub Speaker Connector: Plug in the PowerLockTM connector  
here.  
3. Rear Speaker Connector: Plug in the PowerLockTM connector  
here.  
4. Front Speaker/Remote Connector: Plug in the PowerLockTM  
connector here.  
5. -12dB Attenuation Switch: Push this switch ‘IN’ for high voltage  
input (4V-12V) capability. This button must be pushed ‘IN’ for use  
with speaker level input on common ground head-units or for high  
voltage line drivers.  
6. Sub Input: Plug in the front RCA leads from your source unit  
here.  
7. Rear Inputs: Plug in the rear RCA leads from your source here.  
8. Front Inputs: Plug in the front RCA leads from your source input  
here.  
9. QBASSTM 1 and QBASSTM 2 Freq.: Use these switches,  
QBASSTM 1 and QBASSTM 2 to program the QBASS PLUSTM circuit  
frequency.  
10. Front Gain: Use this control to match the output level of the  
source unit to the front channel of the amplifier.  
11. Front Freq. Control: Move this detented control in a clockwise  
direction to adjust the front crossover frequency from 30Hz to4kHz.  
17  
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 position (switch out) to use the external  
rear RCA input.  
15. Rear Gain: Use this control to match the output level of the head  
unit to the rear channel of the amplifier.  
16. Rear Freq. Control: Move this detented control in a clockwise  
rotation to adjust the rear crossover frequency from 30Hz to 4kHz.  
17. Rear HP/LP/FULL Switch: Select the desired crossover setting,  
HP/LP/FULL for the speaker output signal of the rear channel.  
18. Sub Source INT/EXT Switch: Select the INT position if you  
want to use the internal signal path from the rear crossover for the  
sub input, or the EXT position to use the external sub RCA input.  
19. Sub Gain: Use this control to match the output level of the head  
unit to the sub channel of the amplifier.  
20. Sub Freq. Control: Use this control to adjust the sub high pass  
crossover frequency from 30Hz to 4kHz.  
21. Sub HP/LP/FULL Switch: Select the desired crossover setting,  
HP/LP/FULL for the internal output signal of the sub channel to the  
speaker output.  
18  
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. QBASS PLUSTM: Up to 18dB of bass level control boost.  
4. Cooling Plenums: Maintain a minimum 2” clearance around  
cooling plenums for proper amplifier cooling.  
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
5
2
6
3
7
4
8
Trk 1  
BASS  
TREBLE  
PPI MAR KET ING DPT  
BALANCE  
TRACK  
VOLUME  
LEFT  
RIGHT  
FOWARD  
REVERSE  
(+) Positive  
LEFT input  
(-) Negative  
(+) Positive  
RIGHT input  
(-) Negative  
19  
DCX 300.4, 600.4, 1000.4 BLOCK DIAGRAM  
INPUT ATTENUATION  
INPUT ATTENUATION  
20  
DCX 800.5 BLOCK DIAGRAM  
21  
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. 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 RCA cables.  
QBASS  
For extra BOOM from your  
system, we’ve developed the  
QBASSTM bass control circuit.  
The QBASSTM control is  
located on the end plate  
panel, and allows you to add  
up to 18dB of boost centered  
at 40Hz by rotating the control clockwise.  
22  
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.  
QBASSTM Settings  
1
2
Freq.  
30Hz  
36Hz  
44Hz  
60Hz  
IN  
IN  
IN  
OUT  
IN  
OUT  
OUT  
OUT  
CAUTION: QBASS PLUSTM should only be used in systems with a  
strong subwoofer section. +18dB is a tremendous amount of bass  
boost and may damage your speakers or create excessive distortion  
if abused.  
The optional QBASS REMOTETM: This boost control can be  
mounted in the dash and will supersede the boost control on the  
endplate.  
The PrecisionPower DCXTM amplifiers no longer need an optional  
QPORTTM to connect multiple QBASS PLUSTM equipped amplifiers  
while using one QBASS REMOTETM. The new QBASS PLUSTM  
circuitry in the DCX amplifiers is now positioned before the  
crossover circuit. In doing this, PrecisionPowerTM engineers have  
allowed you to daisy chain your RCA output to the next amplifier  
input, causing the first amplifier’s QBASS REMOTETM to become the  
master control amplifier. See your authorized PrecisionPowerTM  
dealer for more information!  
TC-X CROSSOVER  
23  
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 amplifier for subwoofers, choose high pass (left  
position of switch), or full (right position of switch) to use this  
amplifier for full range speakers.  
The RCA outputs 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  
DCX amplifier allows independent selection of frequencies from  
30Hz-4kHz (see Crossover Detent Chart in this guide).  
DCX 300.4/600.4/1000.4  
Front - 12dB/Octave, Detented High Pass 30Hz-4kHz  
Rear - 12dB/Octave, Detented High Pass; HP/LP/FULL  
RCA Outputs - 12dB/Octave, Detented High Pass; HP/LP/FULL  
QBASS PLUSTM - on Rear Channel - up to 18dB @ 30, 36, 44, 60Hz  
DCX 800.5  
Front - 12dB/Octave, Detented High Pass 30Hz-4kHz  
Rear - 12dB/Octave, Detented High Pass; HP/LP/FULL  
RCA Outputs - 12dB/Octave, Detented; HP/LP/FULL  
Sub-Summed Stereo - 12dB/Octave Detented; 30Hz-4kHz;  
HP/LP/FULL  
QBASS PLUSTM - on Sub Channel - up to 18dB @ 30, 36, 44, 60Hz  
24  
CROSSOVER DETENT CHART  
Low Pass  
Frequency (Hz)  
@ -3dB  
28  
High Pass  
Frequency (Hz)  
@ -3dB  
52  
Detent #  
1
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  
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  
42  
46  
50  
52  
54  
60  
66  
76  
80  
88  
92  
100  
116  
132  
148  
168  
192  
216  
244  
284  
348  
404  
468  
512  
88  
100  
116  
136  
144  
168  
198  
240  
286  
310  
340  
380  
424  
484  
576  
632  
748  
932  
1076  
1428  
1700  
2436  
2830  
2980  
564  
624  
700  
800  
932  
1036  
1144  
1300  
1504  
1812  
2196  
2840  
4116  
4540  
4728  
4728  
25  
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. 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 independently controlled  
amplifiers (rear and subwoofer gain controls) in the system.  
HIGH MASS INTERNAL HEATSINK  
The unique heatsink on your DCX 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 provide ample space around  
the amplifier for cooling: at least 2” on all sides.  
FORCED AIR THERMAL MANAGEMENT  
To manage the additional heat associated with higher output  
capability, a thermally controlled fan has been designed into the  
DCX 1000.4. When the heatsink temperature reaches a pre-  
determined value, the fan is activated and cool air is drawn in  
26  
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. If this is the case, check your speakers and wiring  
for low impedance and short circuits.  
Thermal Protection engaged. The DCX amplifiers will turn off and  
after a minute or so will come back on (the Thermal RED LED will  
illuminate). In this case, ensure that there is nothing blocking the  
normal convection 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.  
27  
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  
Reverse RCA inputs.  
SAME CHANNEL  
Problem is in the speaker or  
speaker wire of the silent  
channel.  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
Reverse RCA inputs  
at head unit.  
SAME CHANNEL  
Problem is in the amplifier.  
See your local Authorized  
PrecisionPower Dealer or  
call 1-800-62POWER.  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
Problem is in the head  
unit or before the amplifier.  
SAME CHANNEL  
Problem is in the RCA  
cables.  
28  
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. During this two-year period, there will be no charge  
for this replacement PROVIDED the unit is returned to Directed, shipping pre-  
paid. If the unit is installed by anyone other than an authorized Directed dealer,  
the warranty period will be 1 year from the date of purchase by the dealer as  
indicated by the date code marking of the product. During this 1-year period there  
will be no charge for this replacement PROVIDED the unit is returned to Directed,  
shipping pre-paid.This warranty is non-transferable and does not apply to any unit  
that has been modified or used in a manner contrary to its intended purpose, and  
does not cover damage to the unit caused by installation or removal of the unit.  
This warranty is void if the product has been damaged by accident or  
unreasonable use, neglect, improper service or other causes not arising out of  
defects in materials or construction. ALL WARRANTIES INCLUDING BUT NOT  
LIMITED TO EXPRESS WARRANTY, IMPLIED WARRANTY, WARRANTY OF  
MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, AND  
WARRANTY OF NON-INFRINGEMENT OF INTELLECTUAL PROPERTY ARE  
EXPRESSLY EXCLUDED TO THE MAXIMUM EXTENT ALLOWED BY LAW,  
AND DIRECTED NEITHER ASSUMES NOR AUTHORIZES ANY PERSON TO  
ASSUME FOR IT ANY LIABILITY IN CONNECTION WITH THE SALE OF THE  
PRODUCT. DIRECTED HAS ABSOLUTELY NO LIABILITY FOR ANY AND ALL  
ACTS OF THIRD PARTIES INCLUDING ITS AUTHORIZED DEALERS OR  
INSTALLERS. Unit must be returned to Directed, postage pre-paid, with:  
consumer’s name, telephone number, and address, authorized dealer’s name and  
address, and product description. IN ORDER FOR THIS WARRANTY TO BE  
VALID, YOUR UNIT MUST BE SHIPPED WITH PROOF OF INSTALLATION BY  
AN AUTHORIZED DIRECTED DEALER. ALL UNITS RECEIVED BY DIRECTED  
FOR WARRANTY REPAIR WITHOUT PROOF OF DIRECTED DEALER  
INSTALLATION WILL BE COVERED BY THE LIMITED 1-YEAR PARTS AND  
LABOR WARRANTY. Note: This warranty does not cover labor costs for the  
removal and reinstallation of the unit. BY PURCHASING THIS PRODUCT, THE  
CONSUMER AGREES AND CONSENTS THAT ALL DISPUTES BETWEEN THE  
CONSUMER AND Directed SHALL BE RESOLVED IN ACCORDANCE WITH  
CALIFORNIA LAWS IN SAN DIEGO COUNTY, CALIFORNIA.  
© 2004 Directed Electronics, Inc. All rights reserved. G48235/40/45/55 01-04  

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