Precision Power DCX 500.2, DCX 300.2 User Manual

AMPLIFIER MODELS

DCX 300.2 DCX 500.2

TABLE OF CONTENTS

Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

QBASS PLUS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Amplifier Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Tools/Parts for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Ground Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Charging System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Current Draw . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Power Wire Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

PowerLock Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

DCX 300.2, DCX 500.2 Front Plate Diagram . . . . . . . . . . . . . . .13

DCX 300.2, DCX 500.2 End Plate Diagram . . . . . . . . . . . . . . . .14

Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Advanced Instrumentation Input . . . . . . . . . . . . . . . . . . . . . . . . .15

QBASS PLUS/QBASS Remote . . . . . . . . . . . . . . . . . . . . . . . . . .16

TC-X Crossover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Crossover Detent Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Adjusting Input Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

High Mass Internal Heatsink . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

AP-IV Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

1

CONGRATULATIONS

Thank you for choosing

PrecisionPower

TM

audio equipment.
Designed and engineered in the USA, this product combines
innovativ e technology with the finest materials to consistently deliver

Absolutely State of the Art

™

performance, sound quality, reliability,

and value. This

PrecisionPower

TM

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

PrecisionPower

TM

products yourself.
Performing maintenance on your audio equipment will void the
warranty. Many parts of the

PrecisionPower

TM

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

PrecisionPower

TM

product will always sound as

good as the day it was purchased. Contact your

Authorized

PrecisionPowerTMDealer

about obtaining any warranty service

through

PrecisionPower

TM

. (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

PrecisionPower

TM

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

New!

Advanced Instrumentation Input Stage.

New!

24dB/Octave;HP/LP/FULL; 30-4kHz Crossover.

New!

Independent Line Output Crossover 30-4kHz
PWM Power Supply
Tr iple Darlington Output Stage.

AP-IV

Protection Circuity

QBASS

TM

Bass Boost
High Voltage Input Capability with -12dB Attention Switch.
Gold Plated RCA Input and Output Connectors.

PowerLock

TM

Speaker and Power Wire Connectors.

2 Yr Warranty; if installed by an Authorized

PrecisionPower

Dealer.

QBASS PLUS SPECIFICATIONS

QBASS PLUS

TM

Up to 18dB of boost with selectable center frequency at 30Hz, 36Hz,
44Hz or 60Hz, with a Q-factor of 2.

Optional

QBASS REMOTE

TM

This boost control can be mounted in the dash and will supersede
the boost control on the amplifier endplate.

3

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 RMS
RCA Output Jacks HP/LP/Full; 30Hz to 4kHz
Input Impedance 20,000 Ohms
Supply V oltage 9–16 V olts
Damping Factor >250 (300.2) 300 (500.2)
Slew Rate >20V/µs
Crossovers Type/Range HP—off/12dB switch 30Hz to 4kHz

LP—off/12dB switch 30Hz to 4kHz
Crossover Slope 12dB/octave
QBass Variable 0 to +12dB boost @ 40Hz
Protection Functions Short and thermal

4

5

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.

Dimensions

Length Width Height

DCX 300.2 24-¾” 10-½” 2-¾”
DCX 500.2 27-

3

/

8” 10-½” 2-¾”

Amp Fuse
DCX 300.2 35 A
DCX 500.2 50 A

AMPLIFIER STATUS LEDS

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 tur n 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.

POWER CLIP OUT

SHORT PROTECT THERMAL PROTECT

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