Precision Power PC2400 User Manual

POWERCLASS

PC2400 / PC2600 / PC21400 OWNER’S MANUAL

™

CONTENTS

(click on a topic to view)

CONGRATULATIONS

FEATURES / SPECIFICATIONS

QBASS PLUS

INSTALLATION

WIRING

WIRING (continued)

POWER / GROUND

POWER, GROUND, and REMOTE

REAR ENDPLATE DIAGRAM

FRONT ENDPLATE DIAGRAM ADDENDUM

INPUTS

CROSSOVER/GAIN CONTROL

THERMAL MANAGEMENT

TROUBLE SHOOTING

SYSTEM DIAGRAM ONE

SYSTEM DIAGRAM TWO

SYSTEM DIAGRAM THREE

SYSTEM DIAGRAM FOUR

BLOCK DIAGRAM

SPEAKER WIRING WARRANTY

Congratulations and thank you.....

for choosing
proudly design, engineer and manufacture audio products at our facility in
Phoenix, Arizona. Our award winning engineering team utilizes innovative
technology to consistently deliver
sound quality, reliability, and value. This
our commitment to offer you unpar alleled versatility and quality for years of
dependable service and listening enjoyment.

PrecisionPower

audio epuipment. At

Absolutely State of the Art

PrecisionPower

PrecisionPower

TM

performance,

product reflects

we

Service

Do not attempt to service
Performing exploratory surgery on your audio equipment yourself
will void the warranty. Many parts of your
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
sound as good as the day it was purchased. Contact your
authorized
service through

PrecisionPower

PrecisionPo wer

PrecisionPower

PrecisionPower

dealer about obtaining any warranty

.(See Warranty insde back cover)

products yourself.

PrecisionPower

product will always

gear

FOR YOUR RECORDS:

Model
Serial Number
Purchase Date

Caution!

The extended use of a high powered audio system may
result in hearing loss or damage. While
systems are capable of
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.

"Concert Level"

PrecisionPower

volumes with

BACK TO CONTENTS

FEATURES / SPECIFICATIONS

Adaptive MOSFET Switching Power Supply
Fully Complementary Triple Darlington Output Stage

AM IV

Protection Circuitry

QBASS PLUS
QBASS REMOTE

Advanced Buss Technology
Forced Air Thermal Management
Two-Way 24dB/Octave Linkwitz-Riley 90Hz Crossover
Crossover Line Outputs
Balanced Differential Input Stage
High Voltage Input Capability with Input Attenuation Switch
Gold Plated RCA Input and Output Connectors

PowerLock

Mixed Mono/Stereo Operation
Three Year Warranty when installed by an Authorized

Completely Designed and Handcrafted in the USA

Specifications

Power Bandwidth 4.5 Hz - 100 kHz
Total Harmonic Distortion 0.02 %
Input T opology Differential
Input Sensitivity 150mv - 12 volts RMS
Input Impedance 10 k Ohms
Load Impedance (stereo) 2 - 8 Ohms
Load Impedance (bridged) 4 - 8 Ohms
Supply Voltage 11 - 15 volts
Damping Factor >500
Slew Rate >50 V/µS
QBASS PLUS
Frequency Centers 30Hz, 36Hz, 44Hz and 60Hz
Idle Current: PC2400

Crossover Two Way, 24dB/Octave Linkwitz-Riley
Crossover Frequency 90Hz

Continuous Output Power Dimensions

PC2400

PC2600

PC21400

™

Bass Boost

™

Compatible

Speaker and Power Wire Connectors

PrecisionPower

™ Up To +18dB Boost

1.5 Amps
PC2600
PC21400

100 WRMS x 2 @ 4Ω per channel Length - 15.75"
200 WRMS x 2 @ 2Ω per channel Height - 2.25"
400 WRMS x 1 @ 4Ω bridged Width - 8.9"

150 WRMS x 2 @ 4Ω per channel Length - 17.75"
300 WRMS x 2 @ 2Ω per channel Height - 2.25"
600 WRMS x 1 @ 4Ω bridged Width - 8.9"

350 WRMS x 2 @ 4Ω per channel Length - 25.25"
700 WRMS x 2 @ 2Ω per channel Height - 2.25"
1400 WRMS x 1 @ 4Ω bridged Width - 8.9"

2 Amps

3 Amps

Dealer

1

BACK TO CONTENTS

QBASS PLUS

™

QBASS PLUS

On

PC2400, PC2600

taken bass control to a higher level with
The two

Q

BASS

end of the amplifier allow you to select one of four
frequency centers - 30Hz, 36Hz, 44Hz and 60Hz. The Q
SELECT switch determines the width of boosted
frequencies. A 'Q' of 2 (switch out) will give you a wide
boost while a 'Q' of 4 will boost a narrow range of
frequencies (See chart below). On the rear end panel
you will find the
an optional
control. Adjust the level control clockwise for up to 18dB
of boost at your selected frequency and Q.

QBASS™

1 2 Freq.
IN IN 30Hz

IN OUT 36Hz
OUT IN 44Hz
OUT OUT 60Hz

Settings

™

and

switches (labeled 1 and 2) on the front

Q

BASS™

Q

BASS REMOTE

+18dB

+12dB

+6dB

0dB

PC21400

amplifiers, we've

Q

BASS PLUS

level control and the plug-in for

™

dash mounted level

44Hz

™

60Hz

Q = 4

Q

BASS PLUS

30Hz

Q = 2

36Hz

™

.

CAUTION:

strong subwoofers. 18dB is a lot of bass boost and could damage full
range speakers.

Optional

Q

BASS PLUS

Q

BASS REMOTE

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

Optional

Q

PORT

™

expansion
module allows one boost control
to operate multiple amplifiers. Each

Q

PORT

as well as another

™

has outputs for four amplifiers

Q

expansion. See your Authorized

™

PORT

should only be used in systems with

™

™

BASS REMOTE

Q

Designed and handcrafted in the USA

™

™

for greater

QBASS

0

+18

PrecisionPower

Dealer for more information!

2

BACK TO CONTENTS

INSTALLATION

Tools/Parts needed for Installation (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, and star washer)

2 - Ring connectors (large enough to accommodate your

method of grounding)
In-line fuse or circuit breaker - see fuse chart below
Power and ground wire - see Power Wire Calculator on page 3
Speaker wire - 16 gauge or larger
Grommets (sized to work with the power wire you plan to use

in your installation)
Tube of silicone sealant

Fuse requirements

Amplifier Maximum Fuse Rating

PC2400
PC2600
PC21400

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 vehic le from fire in case the po wer
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 keep the wiring tidy.

3

60 Amp
80 Amp
160 Amp

BACK TO CONTENTS

WIRING

The following is a basic f ormula to be used as a guide to determine current
draw. A 50% amplifier efficiency rating is used as an average. Your new

POWERCLASS

be less. 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 gauge wire.

Total RMS output x 2 = Total Input Wattage

™

amplifier is more efficient, other amplifiers will probably

Total Input Wattage

Supply V oltage

Example: A

POWERCLASS

= Current Draw (in Amps)

™

2600 amplifier has two channels at 150 watts
per channel RMS rating into 4 Ohms (150 x 2 = 300). You would use the
formula in the following way:

300W x 2 = 600W
600W

= 50A Total current draw.

12V
If the same amplifier is driven into a 2 Ohm stereo or 4 Ohm mono load,

double it's 4 Ohm RMS rating. All
double their power at this load.

300W x 2 x 2 = 1200W
1200W

= 100A 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 Calculator

Recommended MINIMUM Gauge

POWERCLASS

™

amplifiers will effectively

Total Current Draw Length Of Wire To Be Run

( in Amps) Up to 4ft. 4 to 7ft. 7 to 10ft. 10 to 13ft. 13 to 16ft. 16 to 19ft. 19 to 22ft. 22 to 28ft.

0-20 14 12 12 10 10 8 8 8

20-35 12 10 8 8 6 6 6 4
35-50 10 8 8 6 6 4 4 4
50-65 8 8 6 4 4 4 4 2
65-85 6 6 4 4 2 2 2 0
85-105 6 6 4 2 2 2 2 0
105-125 4 4 4 2 2 0 0 0
125-150 2 2 2 2 0 0 0 00

(

NOTE: The ground wire should be the same gauge as the power wire.

4

BACK TO CONTENTS

WIRING

Before beginning, disconnect the negative (-) terminal of the
battery prior to working on the positive (+) terminal to prevent
a short to ground. This is important, unless you want to spend
the rest of your life with a nickname like
Reconnect the negative terminal only after all connections have
been made.

"Sparky,"

or

"Smokey."

Warning!

Fuse must be installed within 18" of battery

5

BACK TO CONTENTS

Grounding

Locate an area near the amplifier(s) that is metal and clean
an area about the size of a quarter to bare metal. Inspect the
area around and underneath to be sure you won't 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 preferably, 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 dra w is ov er 50 amps (or total output
power is ov er 300 watts), y ou should run a ground wire beside
your power wire from the battery to the amplifier(s) in addition
to your regular ground wire. 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.

POWER / GROUND

Charging System Considerations

If your grand total current dra w 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 upg rade
your alternator, battery (or go to multiple batteries), or both.
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
your local authorized

PrecisionPower

PrecisionPower

technical support office at

6

Dealer or call the

1-800-62POWER

BACK TO CONTENTS

.

POWER / GROUND and REMOTE

Once you hav e run both the po w er and ground wires, it's time
to 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

PowerLock

power
and ground connector (supplied). With a small flat b laded screw
driver , loosen the screws before attempting to insert the cables.
Insert the wires into the appropriate hole, and tighten the
screws. Once the wires are secure, the
plugged into the amplifier. The Power/Ground
accommodate 4 gauge wire for the

PC21400

.

PowerLock

may be

PowerLock

PC2400, PC2600

will

and

Power/Ground

Power wires

PowerLock

Fastening screws

Connect to Amplifier

7

BACK TO CONTENTS

ENDPLATE DIAGRAM

2400 / 2600 / 21400

1.

Q

BASS REMOTE

Plug in the data cable from the optional

2. COOLING VENTS (see page 13).

3. POWER / GROUND

4. POWER indicator

5.

6. FORCED AIR INTAKE VENTS (see page 13).

(This will bypass the amplifier's on board

After you have securely connected your power and ground wires, plug in the
Power / Ground

A green light indicates that the amplifier is on.

™

Q

BASS

Level

Turn this control clockwise to boost the

™ plug in

POWERLOCK

POWERLOCK

connector here (see page 7).

Q

BASS REMOTE

Q

BASS

control)

Q

BASS PLUS

™

dash mount level control here.

™

circuit by up to 18dB.

1

QBASS

QBASS

0+18

REMOTE

5

Designed and Handcrafted in the U.S.A.

6

23

+

-

4

POWER

8

BACK TO CONTENTS

ENDPLATE DIAGRAM

2400 / 2600 / 21400

1. FRONT INPUTS

Plug in the RCA leads from your head unit here (see page 11).

2. GAIN

Use this control to match the output level of the head unit to the amplifier (see page 12).

3. HP/LP switch

This switch is used to select whether the amplifier will provide a high
pass (switch in) or low pass (switch out) signal to the speakers. (see page 12).

4.

Q

BASS

1

5.

Use this switch with the

Q

BASS

2

Use this switch with the

Q

BASS

Q

BASS

2 to program the
1 to program the

6. FORCED AIR EXHAUST VENTS (see page 13).

7. SPEAKER/REMOTE CONNECTOR

After connecting remote and speaker wires, plug in the
connector here (see page 10).

21

3

-12dB

1

QBASS

2

INPUTS OUTPUTS

L R

GAIN

HP/LP

XOVER ON/OFF

Q

BASS PLUS

Q

BASS PLUS

™

circuit. (see page 2).

™

circuit. (see page 2).

PowerLock

4

5

L

R

67

L- L+ REM R+ R-

Q SELECT

4/2

8

8. -12dB

For use with high level inputs (4V up to 12V). Push this switch
in to attenuate the input by 12dB (see page 11).

9. XOVER ON/OFF switch

Push this switch in to activate the crossov er , or out f or full range speak er outputs (see page 12).

10. OUTPUTS

Left and Right RCA outputs provide high pass or low pass signal to another amplifier
(see page 12). NOTE - RCA outputs are always high pass or low pass.

11. Q SELECT 4/2

Push this button in for a Q setting of 4 and out for a setting of 2 (see page 2).

12. FORCED AIR INTAKE VENTS (see page 13).

9

9

1110

12

BACK TO CONTENTS

SPEAKER WIRING

Using 16 gauge 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 f ollo wed
for running the power and remote turn-on wires. Cut off e xcess
and, using wire strippers, strip 1/4 inch of insulation. Locate
the speaker/remote turn-on

PowerLock

connector. Loosen
the four 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

Po werLock

Speaker

Power

Right Speaker negative

Right Speaker positive

Left Speaker positive

Left Speaker negative

Lock

Connector

Remote turn on

into the amplifier.

Speaker/Remote

PowerLock

Bridging

All two-channel
bridged into a 4 ohm mono output without switches or bridging
modules. This feature permits the creation of a mono channel
for a subwoofer or center channel.

Deriving the mono channel is accomplished by using the left
channel positive wire as the positiv e speaker wire and the right
channel negative wire 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 (AM IV) may engage.

POWERCLASS

10

™

amplifiers are capable of being

BACK TO CONTENTS

t

INPUTS

There are two sets of RCA jacks on the front end of your
amplifier. The RCA cables from your head unit go in the set
labeled INPUTS. If your head unit doesn't have RCA outputs
don't worry. Simply add a set of RCA plugs (available at your
dealer) to your front or rear set of speaker leads (see dr a wing
below), plug them into the input jacks, and push in the -12dB
input attenuation switch.

SOURCE Headunit

eject

VOLUME

WARNING:

"floating ground") speaker outputs, a suitable high to low level adapter must be
used. If you are unsure about your head unit see your local PrecisionPower
dealer or call 1-800-62Power

123

4

Trk 1

5

BASS

LEFT

876

TREBLE

BALANCE

RIGHT

MAR KET

PPI

TRACK

FOWARD

ING DPT

REVERSE

(+) Positive

LEFT input

(-) Negative

(+) Positive

RIGHT inpu

(-) Negative

If you are using a source unit with bridged high powered (or

Balanced Differential Inputs

This circuitry 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 cab le.

music

signal and ground

music

noise

noise

noise

(+)

( + =)

( )

music noise

(+)

( - = 0 )

( )

noise cancels

11

music

and noise

music

NO noise

BACK TO CONTENTS

CROSSOVER and GAIN CONTROL

Crossover

Your new

POWERCLASS

™

amplifier has a 90Hz fourth-order
Linkwitz-Riley type, 24dB per octave phase correlated
crossover built in to pro vide system flexibility without the added
expense and installation of an outboard crossov er. The speaker
outputs of your amplifier are high pass or low pass according
to the HP/LP switch on the front endplate.
You would choose low pass (switch out) to use this amp for
subwoofers, or choose high pass (switch in) to use this amp
for full range speakers . The RCA outputs are controlled by the
same HP/LP switch, but are alw a ys the in verse of the speak er
output crossover. If the HP/LP switch is out (LP) the RCA
outputs will be high pass, and if the HP/LP switch is in (HP) the
RCA outputs will be low pass. In addition, the speaker outputs
can be all pass (no crossover) b y setting the XOVER ON/OFF
switch to the off (out) position.

NOTE: The RCA outputs are alwa ys crossed over . The System
Diagrams beginning on page 14 show se ver al wa ys to use the
internal crossover in your system.

Adjusting The Amplifier Input Gain

1. Adjust all amplifier input gain controls to just abo ve minimum
sensitivity (fully counterclockwise).

2. Using the cleanest source (CD), with music playing turn up
the head unit until you can hear distortion. No w turn it down a
bit until you cannot hear the distortion.

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 bac kground
noise and prevents overload.

4. Repeat step 3 for any remaining amplifiers in the system.

12

BACK TO CONTENTS

THERMAL MANAGEMENT

Heatsink Cooling

The unique heatsink on
your

POWERCLASS

™

amplifier has been
designed with fins on the
inside of the aluminum
mass. 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 ha ve 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

PC2600

and

PC21400

. When the heatsink temperature
reaches a pre-determined value, the fan is activated and
cool air is drawn in 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
endplate exhaust
vents.

Warm Air Exhaust

Cool Air Intake

13

BACK TO CONTENTS

TROUBLE SHOOTING

NO SOUND Is the LED lit?

YES

NO

Check Power and Remote turn-on wire
for voltage. Make sure Ground wire is
secure.

STILL NO SOUND - See your Authorized

1-800-62POWER

SOUND IN ONE CHANNEL ONLY

Reverse left and right speakers by unplugging the speaker connector, turning it
over and plugging it back in.

OPPOSITE CHANNEL

Reverse RCA inputs

OPPOSITE CHANNEL

Reverse RCAs at head unit

OPPOSITE CHANNEL

Problem is in the head unit

AMPLIFIER TURNS DOWN

.

SOUND IS NOW IN

SOUND IS NOW IN

SOUND IS NOW IN

PrecisionPower

Problem is in the speaker or speaker
wire of the silent channel.

Problem is in the Amplifier. See your
local Authorized
or call

1-800-62POWER

Problem is in the RCA cables

Dealer or call

SAME CHANNEL

SAME CHANNEL

PrecisionPower

.

SAME CHANNEL

Dealer

Both excessive temperature and low impedance (or short circuit)
conditions will activate the amplifier's AM IV protection circuitry, which
turns down the amplifier's output. When the amplifier cools do wn, or the
impedance is corrected, the AM IV will restore full power.
If your amp is turning down check your speakers and wiring for low
impedance and short circuits.Also,ensure that there is nothing blocking
the normal convective 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.

14

BACK TO CONTENTS

SYSTEM DIAGRAM

ONE

Source Unit

eject

123

4

Trk 1

5

876

BASS

TREBLE

MARKET

PPI

INGDPT

BALANCE

TRACK

VOLUME

RIGHT

FOWARD

REVERSE

LEFT

Tweeter

Passive

Crossover

POWER

CLASS™

Crossover Off

Passive

Crossover

Subwoofer

Amplifier

Passive

Crossover

Tweeter

MidRangeMidRange

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" oper ation.
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.

15

BACK TO CONTENTS

SYSTEM DIAGRAM

TWO

Source Unit

eject

123

4

Trk 1

5

876

BASS

TREBLE

MARKET

PPI

INGDPT

BALANCE

TRACK

VOLUME

RIGHT

FOWARD

REVERSE

LEFT

Tweeter

Subwoofer

Passive

Crossover

POWER

CLASS™

High Pass 90Hz

Low Pass Out to Sub Amplifier

POWER

CLASS™

Crossover off or Low Pass

Amplifier

Amplifier

Passive

Crossover

Tweeter

MidRangeMidRange

Subwoofer

16

BACK TO CONTENTS

PSC-221

PAR-245

Preamp/Equalizer

ByPass

L

Invert

L

R

in •

Non-inverted /

out •

Inverted /

Phase Shift Control

SYSTEM DIAGRAM

THREE

Source Unit

eject

123

4

Trk 1

5

876

BASS

TREBLE

MARKET

PPI

INGDPT

BALANCE

TRACK

VOLUME

RIGHT

FOWARD

REVERSE

LEFT

R

Input

L

R

Input Sensitivity

Rear

Output

L

R

Front

Output

L

LED Select

1

2

3

4

Precision

PAR-245

Sub

Volume

Power

Low

Power
In-Clip

Phase Shift Control

Power

Power

0
0

6
0
2

Precision

2

PSC-221

o

0

0
1

-ø

Left Phase

Input

L

ByPass

Invert

R

R

Ground

Remote

Active

Power

ByPass

Low

-M

F

id

R

Fader

Made in USA

Defeat

Sub Low Low-Mid

++++

+

High-Mid

Treble

PAR-245

A
S
U

ade in
M

600

220

o

100

-ø

Right Phase

Power

Precision

Power

Frequency Adjust

H

igh-M

id

Treble

Rear OutputFront Output

Tweeter

MidRange

Passive

Crossover

POWER

CLASS™

High Pass at 90 Hz

Amplifier

Subwoofer

Passive

Crossover

17

Tweeter

MidRange

POWER

CLASS™

Low Pass at 90 Hz

Subwoofer

Amplifier

BACK TO CONTENTS

PAR-245

PMQ-210

Ten Band Parametric EQ

SYSTEM DIAGRAM

FOUR

Source Unit

eject

123

4

Trk 1

5

876

BASS

TREBLE

MARKET

PPI

ING DPT

BALANCE

TRACK

VOLUME

RIGHT

FOWARD

REVERSE

LEFT

R

Input

L

R

Inp

Rear

u

t S

Output

e
n
sitivity

L

R

Front

O

u

tp

ut

L

LED Select

1

Frequency Adjust

2

3

4

Precision

PAR-245

Sub

Volume

Power

Low

Preamp/Equalizer

FRX-456

Power
In-Clip

Input

L

R

Crossover

Low-M

F

id

High-M

R

id

Fader

Defeat

attenuation

-12dB in
stereo•out

mono•in

L

combined
inputs • in

R

Treble

Made in USA

Sub Low Low-Mid

++++

+

High-Mid Treble

PAR-245

4KHz-9.37KHz

1.95KHz-4.5Khz

940Hz-1.25KHz

HL

330Hz-1KHz

Q

HL

160Hz-550Hz

Q

HL

41.5

80Hz-260Hz

Q

HL

41.5

Cut / Boost

40Hz-130Hz

Q

HL

41.5

Cut / Boost

20Hz-70Hz

er

Pow

Power

Precision

PMQ-210

Output

R

Ground

Remote

Power

L

Power

16

Precision

10

+

FRX-456

_

∞

Low Pass Gain

Power

Inputs

L

R

rear

Ground

Remote

Power

front

+12db

Q

HL

41.5

-12db

Cut / Boost

Q

+12db

41.5

-12db

Cut / Boost

+12db

-12db

Cut / Boost

+12db

EQ

-12db

Defeat

Power

Precision

USA

Made in

Four/Five/Six Way Electronic Crossover

+

_

752
344
152

Rear Fill Level

344

7.4K

192

80

112

Tweeter

752

1.77K

344

80

Rear

152

Mid Range

344

7.4K

192

80

112

Tweeter

272

1.77K

172

80
92
118

Mid Range

492

70

56

Front

36
25

Mid Bass

264

22

46

Low Pass

7
0
1
+

Sub Sonic

Subwoofer

Power

Precision

High Pass Frequencies

Power

14KHz-23.37KHz

HL

Q

9.37KHz-15.75KHz

HL

Q

HL

41.5

Q

HL

Cut / Boost

41.5

Q

Cut / Boost

41.5

-12db

Cut / Boost

41.5

+12db

-12db

Cut / Boost

+12db

-12db

+12db

-12db

PSC-221

41.5

Cut / Boost

+12db

USA

-12db

Made in

+12db

-12db

+12db

10 Band Parametric Equalizer

Precision

ByPass

L

Invert

L

ByPass

R

in •

Non-inverted /

out •

Inverted /

Active
ByPass

Phase Shift Control

SA
U

Phase Shift Control

ade in
M

0
0
6

0
2
2

o

0
0
1

-ø

Right Phase

Power

Power

600

220

PSC-221

o

100

-ø

Left Phase

Input

L

Power

Precision

Invert

R

R

Ground

Remote

Power

Tweeter

Mid Range

Subwoofer

POWER

POWER

POWER

CLASS™

Crossover off

CLASS™

Crossover off

CLASS™

Crossover off

Tweeter

Amplifier

Mid Range Frequencies

Mid Range

Amplifier

Low Pass Frequencies

Subwoofer

Amplifier

18

BACK TO CONTENTS

BLOCK DIAGRAM

High Pass

Low Pass

High Pass

Low Pass

X-OVER ON/OFF

HP/LP SELECT

RCA

Output

RCA

Output

RCA

Right

Input

DIF.

DIF.

RCA

Left

Input

- 12dB INPUT ATTENUATION

Right

Left

mute

AMP

gain

mute

AMP

gain

90Hz

90Hz

mute

mute

24dB / octave

24dB / octave

Q

BASS

PLUS

™

optional

Q

BASS REMOTE

™

19

BACK TO CONTENTS

POWERCLASS ADDENDUM

Your new

POWERCLASS

™

amplifier
may have been updated to include a
variable detented crossover in place
of the Q 4/2 function switch. The
crossover is adjustable from 20 Hz
to 5 kHz. Please refer to the
endplate diagram and detent chart
provided for frequency adjustments .
The XOVER FREQ control has
detents, or “clicks” as y ou rotate it.
Each "click" counted from the full
counterclockwise position
corresponds to a specific frequency.
This will add more accurate tuning
to your system.
Also, refer to your owner’s manual
for installation instructions.
As always,

PrecisionPower

will
continue to improve the products
and services we have to off er you.
Thank you for choosing

PrecisionPower!

New variable crossover

DETENT XOVER FREQ

1 20 Hz
2 21 Hz
3 21 Hz
4 21.5 Hz
5 22 Hz
6 23 Hz
7 24.5 Hz
8 26 Hz
9 27.5 Hz
10 30 Hz
11 32 Hz
12 35 Hz
13 39 Hz
14 43 Hz
15 49 Hz
16 56 Hz
17 64 Hz
18 73 Hz
19 80 Hz
20 88 Hz
21 100 Hz
22 114 Hz
23 134 Hz
24 160 Hz
25 196 Hz
26 260 Hz
27 320 Hz
28 368 Hz
29 432 Hz
30 496 Hz
31 608 Hz
32 752 Hz
33 864 Hz
34 1008 Hz
35 1200 Hz
36 1488 Hz
37 1952 Hz
38 2816 Hz
39 4512 Hz
40 4944 Hz
41 5000 Hz

GAIN

HP/L P

-12dB

QBASS

1

2

INPUTS OUTPUTS

L R

XOVER ON/OFF

L

R

L- L + RE M R+ R-

XOVER

FREQ.

BACK TO CONTENTS

WARRANTY

Three-Year Limited U.S.A. Warranty

This warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
workmanship under normal use and service for a period of three (3) years from the date of
original purchase when the unit is installed by an Authorized Dealer. Non-Authorized Dealer
installed products carry a one (1) year parts and ninety (90) days labor limited warranty. The
extent and conditions of Limited Warranty are as follows:

1. A uthorized Dealer Installed Products:
to the original purchaser, any unit which
and under warranty, provided the defect occurs within three (3) years from the date of original
purchase when the unit is installed by an Authorized Dealer and the product is returned immedi­ately to

2. Non-Authorized Dealer Installed Products:
charge, to the original purchaser, any unit which
defective and under warranty, provided the defect occurs within ninety (90) days from the date of
purchase and the product is returned immediately to
ninety (90) days for Non-Authorized Dealer Installed Products will be for parts only and will
extend for one (1) year from the date of purchase. This warranty is not transferable.

3. The date of purchase and proof of Authorized Dealer Installation of a PrecisionPower product
must be established by an original sales receipt which must accompany the article being re­turned for warranty work.

4. This warranty shall NOT apply to any
tory serial number removed or defaced. All products received (by
ranty or out of warranty repair , with their original serial numbers removed or def aced, will NO T be
repaired and will be returned to sender, freight collect. Refer to original packaging for the serial
number of your component speakers.

5. The provisions of this warranty shall not apply to any
purpose for which it is not designed, which has been repaired or altered in any way, or which has
been connected, installed, or adjusted other than in accordance with the instructions furnished in

PrecisionPower’ s

subject to misuse, neglect, or accident.

6. PrecisionPower does not authorize any other persons to assume any other liability in connec­tion with its products. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY MADE BY
PRECISIONPOWER APPLICABLE TO ITS PRODUCTS. ANY IMPLIED WARRANTY OR MER­CHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE APPLICABLE TO
PRECISIONPOWER PRODUCTS IS LIMITED IN DURATION TO THE DURATION OF THIS
LIMITED WARRANTY. PRECISIONPOWER SHALL NOT BE LIABLE FOR THE INCIDENTAL,
CONSEQUENTIAL, OR COMMERCIAL DAMAGES RESULTING FROM THE BREACH OF THIS
WRITTEN WARRANTY. Some states or provinces do not allow the exclusion or limitation of
incidental or consequential damages or limitations on how long an implied warranty lasts; so the
above limitations or exclusions may not apply to you.

7. Y our product will be serviced on an in-warranty basis within the w arranty period for the correc­tion of warranted defects. If improper operation of your
contact your Authorized Dealer for assistance with the return and factory repair of your

PrecisionPower

product. If an Authorized Dealer is not available, return the unit including your name, telephone
number, return address, a copy of your sales receipt, and a description of the problem to:

TO RETURN PRECISIONPOWER PR ODUCTS OUT OF WARRANTY: Return the unit, postage
prepaid, in the original protective carton. Please include a description of the problem and, if
desired, a request for an estimate of repair costs. Unless a request for an estimate is included,
the unit will be repaired as necessary. Please contact
800-62-POWER for questions concerning out of warranty repair charges. Repaired unit will be
returned with an itemized statement, C.O.D.

PrecisionPower

PrecisionPower

owner’s manual. Nor shall this warranty apply to any part which has been

warrants its products to be free from defects in materials and

PrecisionPower

PrecisionPower’ s

. This warranty is not transferable.

PrecisionPower

PrecisionPower

PrecisionPower,Inc.

Service Department

4829 S. 38th Street

Phoenix, AZ 85040-2964

will either repair or replace at no charge,

examination discloses to be defective

PrecisionPower’s

will either repair or replace at no

examination discloses to be

PrecisionPower

product found to have the original fac-

PrecisionPower

PrecisionPower

PrecisionPower

. Warranty claims beyond

PrecisionPower

product used for a

product should occur,

Customer Service at 1-

) for in war-

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