Precision Power Stereo System PC2400 User Manual

POWERCLASS™  
PC2400 / PC2600 / PC21400 OWNER’S MANUAL  
CONTENTS  
(click on a topic to view)  
CONGRATULATIONS  
INPUTS  
FEATURES / SPECIFICATIONS  
QBASS PLUS  
CROSSOVER/GAIN CONTROL  
THERMAL MANAGEMENT  
TROUBLE SHOOTING  
SYSTEM DIAGRAM ONE  
SYSTEM DIAGRAM TWO  
SYSTEM DIAGRAM THREE  
SYSTEM DIAGRAM FOUR  
BLOCK DIAGRAM  
INSTALLATION  
WIRING  
WIRING (continued)  
POWER / GROUND  
POWER, GROUND, and REMOTE  
REAR ENDPLATE DIAGRAM  
FRONT ENDPLATE DIAGRAM  
SPEAKER WIRING  
ADDENDUM  
WARRANTY  
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FEATURES / SPECIFICATIONS  
Adaptive MOSFET Switching Power Supply  
Fully Complementary Triple Darlington Output Stage  
AM IV Protection Circuitry  
QBASS PLUS Bass Boost  
QBASS REMOTE Compatible  
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 Speaker and Power Wire Connectors  
Mixed Mono/Stereo Operation  
Three Year Warranty when installed by an Authorized PrecisionPower Dealer  
Completely Designed and Handcrafted in the USA  
Specifications  
Power Bandwidth  
Total Harmonic Distortion  
Input Topology  
4.5 Hz - 100 kHz  
0.02 %  
Differential  
Input Sensitivity  
150mv - 12 volts RMS  
10 k Ohms  
2 - 8 Ohms  
4 - 8 Ohms  
11 - 15 volts  
Input Impedance  
Load Impedance (stereo)  
Load Impedance (bridged)  
Supply Voltage  
Damping Factor  
>500  
Slew Rate  
>50 V/µS  
QBASS PLUS™  
Frequency Centers  
Idle Current:  
Up To +18dB Boost  
30Hz, 36Hz, 44Hz and 60Hz  
PC2400 1.5 Amps  
PC2600 2 Amps  
PC21400 3 Amps  
Two Way, 24dB/Octave Linkwitz-Riley  
90Hz  
Crossover  
Crossover Frequency  
Continuous Output Power  
PC2400  
Dimensions  
100 WRMS x 2 @ 4per channel  
200 WRMS x 2 @ 2per channel  
400 WRMS x 1 @ 4bridged  
PC2600  
Length - 15.75"  
Height - 2.25"  
Width - 8.9"  
150 WRMS x 2 @ 4per channel  
300 WRMS x 2 @ 2per channel  
600 WRMS x 1 @ 4bridged  
PC21400  
Length - 17.75"  
Height - 2.25"  
Width - 8.9"  
350 WRMS x 2 @ 4per channel  
700 WRMS x 2 @ 2per channel  
1400 WRMS x 1 @ 4bridged  
Length - 25.25"  
Height - 2.25"  
Width - 8.9"  
1
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QBASS PLUS™  
QBASS PLUS™  
On PC2400, PC2600 and PC21400 amplifiers, we've  
taken bass control 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. 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 QBASSlevel control and the plug-in for  
an optional QBASS REMOTEdash mounted level  
control. Adjust the level control clockwise for up to 18dB  
of boost at your selected frequency and Q.  
QBASS PLUS™  
QBASS™ Settings  
Q = 2  
Q = 4  
1
IN  
IN  
OUT  
OUT  
2
IN  
OUT  
IN  
Freq.  
30Hz  
36Hz  
44Hz  
60Hz  
+18dB  
+12dB  
+6dB  
0dB  
OUT  
36Hz  
44Hz  
30Hz  
60Hz  
CAUTION: QBASS PLUSshould only be used in systems with  
strong subwoofers. 18dB is a lot of bass boost and could damage full  
range speakers.  
Optional QBASS REMOTE™  
This boost control can be mounted in the  
TE  
REMO  
dash and will supersede the boost  
control on the endplate.  
ASS  
B
Q
Designed and handcrafted in the USA  
Q
B
ASS  
Optional QPORTexpansion  
module allows one boost control  
to operate multiple amplifiers. Each  
+18  
QPORThas outputs for four amplifiers  
as well as another QPORTfor greater  
expansion. See your Authorized PrecisionPower  
Dealer for more information!  
2
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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  
PC2400  
PC2600  
PC21400  
Maximum Fuse Rating  
60 Amp  
80 Amp  
160 Amp  
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 keep the wiring tidy.  
3
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WIRING  
The following is a basic formula to be used as a guide to determine current  
draw. A 50% amplifier efficiency rating is used as an average. Your new  
POWERCLASS amplifier is more efficient, other amplifiers will probably  
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  
Total Input Wattage  
= Current Draw (in Amps)  
Supply Voltage  
Example:A POWERCLASS 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  
12V  
= 50A Total current draw.  
If the same amplifier is driven into a 2 Ohm stereo or 4 Ohm mono load,  
double it's 4 Ohm RMS rating.All POWERCLASS amplifiers will effectively  
double their power at this load.  
300W x 2 x 2 = 1200W  
1200W  
12V  
= 100A 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.  
Power Wire Calculator  
Recommended MINIMUM Gauge  
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  
20-35  
35-50  
50-65  
65-85  
85-105  
105-125  
125-150  
14  
12  
10  
8
6
6
12  
10  
8
8
6
6
4
2
12  
8
8
6
4
4
4
2
10  
8
6
4
4
2
2
2
10  
6
6
4
2
2
2
0
8
6
4
4
2
2
0
0
8
6
4
4
2
2
0
0
8
4
4
2
0
0
0
00  
4
2
(
NOTE: The ground wire should be the same gauge as the power wire.  
4
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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 "Sparky," or "Smokey."  
Reconnect the negative terminal only after all connections have  
been made.  
Warning!  
Fuse must be installed within 18" of battery  
5
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POWER / GROUND  
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 draw is over 50 amps (or total output  
power is over 300 watts), you 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.  
Charging System Considerations  
If your grand 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 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 Dealer or call the  
PrecisionPower technical support office at 1-800-62POWER.  
6
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POWER / GROUND and REMOTE  
Once you have run both the power 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 bladed 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 PowerLock may be  
plugged into the amplifier. The Power/Ground PowerLock will  
accommodate 4 gauge wire for the PC2400, PC2600 and  
PC21400.  
Power/Ground PowerLock  
Fastening screws  
Power wires  
Connect to Amplifier  
7
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ENDPLATE DIAGRAM  
2400 / 2600 / 21400  
1. QBASS REMOTE™ plug in  
Plug in the data cable from the optional QBASS REMOTEdash mount level control here.  
(This will bypass the amplifier's on board QBASS control)  
2. COOLING VENTS (see page 13).  
3. POWER / GROUND POWERLOCK  
After you have securely connected your power and ground wires, plug in the  
Power / Ground POWERLOCK connector here (see page 7).  
4. POWER indicator  
A green light indicates that the amplifier is on.  
5. QBASSLevel  
Turn this control clockwise to boost the QBASS PLUScircuit by up to 18dB.  
6. FORCED AIR INTAKE VENTS (see page 13).  
1
4
2
3
POWER  
Designed and Handcrafted in the U.S.A.  
QBASS  
0
+
18  
QBASS  
+
-
REMOTE  
5
6
8
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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. QBASS 1  
Use this switch with the QBASS 2 to program the QBASS PLUScircuit. (see page 2).  
5. QBASS 2  
Use this switch with the QBASS 1 to program the QBASS PLUScircuit. (see page 2).  
6. FORCED AIR EXHAUST VENTS (see page 13).  
7. SPEAKER/REMOTE CONNECTOR  
After connecting remote and speaker wires, plug in the PowerLock  
connector here (see page 10).  
1
2
3
4
5
6
7
QBASS  
2
INPUTS  
GAIN  
OUTPUTS  
L- L+ REM R+ R-  
L
R
1
L
HP/LP  
-12dB  
Q SELECT  
4/2  
XOVER ON/OFF  
R
8
10 11  
12  
9
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 crossover, or out for full range speaker 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
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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 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 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 PowerLock into the amplifier.  
Speaker PowerLock Connector  
Right Speaker negative  
Right Speaker positive  
Remote turn on  
Left Speaker positive  
Left Speaker negative  
Speaker/Remote PowerLock  
Bridging  
All two-channel POWERCLASS amplifiers are capable of being  
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 positive 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.  
10  
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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 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  
WARNING: If you are using a source unit with bridged high powered (or  
"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  
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 cable.  
music  
noise  
(+)  
(
+
=)  
( )  
signal and ground  
music noise  
music  
and noise  
music  
noise  
noise  
(+)  
( )  
(
-
= 0 )  
noise cancels  
music  
NO noise  
11  
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CROSSOVER and GAIN CONTROL  
Crossover  
Your new POWERCLASSamplifier has a 90Hz fourth-order  
Linkwitz-Riley type, 24dB per octave phase correlated  
crossover built in to provide system flexibility without the added  
expense and installation of an outboard crossover. 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 always the inverse of the speaker  
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) by setting the XOVER ON/OFF  
switch to the off (out) position.  
NOTE:The RCA outputs are always crossed over.The System  
Diagrams beginning on page 14 show several ways to use the  
internal crossover in your system.  
Adjusting The Amplifier Input Gain  
1. Adjust all amplifier input gain controls to just above minimum  
sensitivity (fully counterclockwise).  
2. Using the cleanest source (CD), with music playing turn up  
the head unit until you can hear distortion. Now 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 background  
noise and prevents overload.  
4. Repeat step 3 for any remaining amplifiers in the system.  
12  
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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 have 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.  
Cool Air Intake  
Warm Air Exhaust  
13  
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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 PrecisionPower Dealer or call  
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.  
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  
SAME CHANNEL  
OPPOSITE CHANNEL  
Problem is in the Amplifier. See your  
local Authorized PrecisionPower Dealer  
or call 1-800-62POWER.  
Reverse RCAs at head unit  
SOUND IS NOW IN  
OPPOSITE CHANNEL  
Problem is in the head unit  
SAME CHANNEL  
Problem is in the RCA cables  
AMPLIFIER TURNS DOWN  
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 down, 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.  
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SYSTEM DIAGRAM  
ONE  
Source Unit  
eject  
1
2
3
4
5
6
7
8
Trk  
1
BASS  
TREBLE  
BALANCE  
TRACK  
P
P
I
M
A
R
K
E
T
I
N
G
D
P
T
VOLUME  
LEFT  
RIGHT  
FOWARD  
REVERSE  
Passive  
Crossover  
Passive  
Crossover  
Tweeter  
Tweeter  
MidRange  
MidRange  
POWERCLASS Amplifier  
Crossover Off  
Passive  
Crossover  
Subwoofer  
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.  
15  
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SYSTEM DIAGRAM  
TWO  
Source Unit  
eject  
1
2
3
4
5
6
7
8
Trk  
1
BASS  
TREBLE  
BALANCE  
TRACK  
P
P
I
M
A
R
K
E
T
I
N
G
D
P
T
VOLUME  
LEFT  
RIGHT  
FOWARD  
REVERSE  
Passive  
Crossover  
Passive  
Crossover  
Tweeter  
Tweeter  
MidRange  
MidRange  
POWERCLASS Amplifier  
High Pass 90Hz  
Low Pass Out to Sub Amplifier  
Subwoofer  
Subwoofer  
POWERCLASS Amplifier  
Crossover off or Low Pass  
16  
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SYSTEM DIAGRAM  
THREE  
Source Unit  
eject  
1
2
3
4
5
6
7
8
Trk  
1
BASS  
TREBLE  
BALANCE  
TRACK  
P
P
I
M
A
R
K
E
T
I
N
G
D
P
T
VOLUME  
LEFT  
RIGHT  
FOWARD  
REVERSE  
R
In  
pu  
t
L
In  
R
pu  
R
pu  
t
O
ea  
t
r
S
ut  
en  
si  
ti  
L
vi  
ty  
R
Fr  
ont  
pu  
O
ut  
t
L
LE  
D
S
el  
ec  
t
1
P
ow  
er  
2
Fr  
e
q
3
ue  
n
c
4
y
P
A
d
ju  
st  
re  
c
is  
io  
P
A
Su  
b
V
n
P
ow  
o
lu  
R
-
m
e
2
4
e
r
Lo  
w
5
Po  
w
Low  
er  
-M  
id  
F
In  
H
-
R
igh  
-M  
i
id  
Tr  
eb  
le  
+
M
d
ad  
e
in  
er  
+
D
U
S
ef  
ea  
A
t
+
+
w
+
id  
M
id  
l
e
P
A
R
-2  
45  
PAR-245 Preamp/Equalizer  
Front Output  
Rear Output  
l
tro  
on  
C
h
ift  
A
S
S
U
se  
ha  
in  
e
ad  
P
M
0
0
60  
22  
0
o
10  
se  
P
ha  
-ø  
t
R
i
gh  
r
e
w
r
e
o
P
w
o
P
n
io  
is  
c
1
0
60  
re  
22  
0
P
-
22  
0
C
S
P
o
10  
e
as  
P
h
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ft  
Le  
s
s
a
In  
r
e
P
p
y
u
t
w
o
B
r
t
L
P
n
L
e
v
io  
I
n
s
s
is  
c
re  
L
a
P
y
P
B
rt  
R
ve  
In  
R
in  
R
d
N
t
n
o
n  
-in  
u
te  
u
o
o
ve  
r
r
In  
r
G
m
v
e
d
e
e
rt  
/
A
R
w
ed  
o
c
/
B
ti  
P
e  
yP  
a
ss  
PSC-221 Phase Shift Control  
Passive  
Crossover  
Passive  
Crossover  
Tweeter  
Tweeter  
MidRange  
MidRange  
POWERCLASS Amplifier  
High Pass at 90 Hz  
Subwoofer  
Subwoofer  
POWERCLASS Amplifier  
Low Pass at 90 Hz  
17  
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SYSTEM DIAGRAM  
FOUR  
Source Unit  
eject  
1
2
3
4
5
6
7
8
Trk 1  
BASS  
TREBLE  
BALANCE  
TRACK  
P
P
I
M
A
R
K
E
T
I
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VOLUME  
LEFT  
RIGHT  
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R
In  
pu  
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pu  
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pu  
ea  
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Fr  
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2
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45  
Hz  
7K  
3.3  
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KH  
14  
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Hz  
5K  
5.7  
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Hz  
7K  
9.3  
L
Q
H
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KH  
4
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PAR-245 Preamp/Equalizer  
4K  
Hz  
L
t
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Q
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1
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M
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Hz  
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+
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r
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5
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/
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1
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z-1  
0H  
33  
b
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B
1
st  
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1
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5
1
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60  
-2  
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80  
4
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L
2
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+
1
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5
1
H
ost  
Hz  
/
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1
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30  
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40  
1
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5
+
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4
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+
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st  
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4
/
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1
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1
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PMQ-210 Ten Band Parametric EQ  
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Cr  
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7
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8
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A
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10  
2
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M
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si  
c
6
2
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45  
P
-
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+
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w
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4
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7
_
i
c
se  
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+
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-ø  
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w
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w
P
n
Po  
io  
is  
In  
c
1
0
60  
L
p
L
re  
22  
0
u
P
-
C
22  
ts  
S
P
o
0
10  
r
e
w
e
as  
o
c
n
io  
P
-ø  
ft  
Le  
P
h
o
m
b
in  
is  
e
c
in  
d
R
re  
P
p
u
ts  
in  
R
s
s
d
a
In  
r
e
n
P
u
e
y
p
u
t
r
o
o
t
B
t
w
o
re  
G
m
r
e
r
L
P
n
a
e
e
L
v
r
R
w
n
s
io  
o
I
s
is  
c
re  
P
L
a
P
fr  
y
P
o
B
n
rt  
R
ve  
In  
R
in  
R
d
N
t
n
o
on  
-in  
u
te  
u
o
o
ve  
r
r
In  
rt  
e
G
m
v
e
d
e
e
rt  
/
A
R
w
ed  
o
c
/
B
ti  
P
ve  
yP  
a
ss  
FRX-456 Crossover  
PSC-221 Phase Shift Control  
High Pass Frequencies  
Tweeter  
Mid Range  
Subwoofer  
Tweeter  
POWERCLASS Amplifier  
Crossover off  
Mid Range Frequencies  
Mid Range  
POWERCLASS Amplifier  
Crossover off  
Low Pass Frequencies  
Subwoofer  
POWERCLASS Amplifier  
Crossover off  
18  
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BLOCK DIAGRAM  
BSA  
PULS  
Q
BSARMOTE  
Q
- 12dB INPUT ATTENUATION  
19  
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POWERCLASS ADDENDUM  
DETENT  
XOVER FREQ  
1
20 Hz  
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  
2
21 Hz  
3
21 Hz  
4
21.5 Hz  
22 Hz  
5
6
23 Hz  
7
24.5 Hz  
26 Hz  
8
9
27.5 Hz  
30 Hz  
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  
32 Hz  
endplate diagram and detent chart  
provided for frequency adjustments.  
The XOVER FREQ control has  
detents, or “clicks” as you rotate it.  
Each "click" counted from the full  
counterclockwise position  
35 Hz  
39 Hz  
43 Hz  
49 Hz  
56 Hz  
64 Hz  
73 Hz  
80 Hz  
88 Hz  
100 Hz  
114 Hz  
134 Hz  
160 Hz  
196 Hz  
260 Hz  
320 Hz  
368 Hz  
432 Hz  
496 Hz  
608 Hz  
752 Hz  
864 Hz  
1008 Hz  
1200 Hz  
1488 Hz  
1952 Hz  
2816 Hz  
4512 Hz  
4944 Hz  
5000 Hz  
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 offer you.  
Thank you for choosing  
PrecisionPower!  
New variable crossover  
QBASS  
2
INPUTS  
GAIN  
OUTPUTS  
L- L+ REM R+ R-  
L
R
1
L
HP/LP  
-12dB  
XOVER  
FREQ.  
XOVER ON/OFF  
R
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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. PrecisionPower warrants its products to be free from defects in materials and  
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. Authorized Dealer Installed Products:PrecisionPower will either repair or replace at no charge,  
to the original purchaser, any unit which PrecisionPower’s examination discloses to be defective  
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 immedi-  
ately to PrecisionPower. This warranty is not transferable.  
2. Non-Authorized Dealer Installed Products: PrecisionPower will either repair or replace at no  
charge, to the original purchaser, any unit which PrecisionPower’s examination discloses to be  
defective and under warranty, provided the defect occurs within ninety (90) days from the date of  
purchase and the product is returned immediately to PrecisionPower. Warranty claims beyond  
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 re-  
turned for warranty work.  
4. This warranty shall NOT apply to any PrecisionPower product found to have the original fac-  
tory serial number removed or defaced. All products received (by PrecisionPower) for in war-  
ranty or out of warranty repair, with their original serial numbers removed or defaced, will NOT 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 PrecisionPower product used for a  
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 owner’s manual. Nor shall this warranty apply to any part which has been  
subject to misuse, neglect, or accident.  
6. PrecisionPower does not authorize any other persons to assume any other liability in connec-  
tion with its products. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY MADE BY  
PRECISIONPOWER APPLICABLE TO ITS PRODUCTS. ANY IMPLIED WARRANTY OR MER-  
CHANTABILITY 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.Your product will be serviced on an in-warranty basis within the warranty period for the correc-  
tion of warranted defects. If improper operation of your PrecisionPower product should occur,  
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:  
PrecisionPower,Inc.  
Service Department  
4829 S. 38th Street  
Phoenix, AZ 85040-2964  
TO RETURN PRECISIONPOWER PRODUCTS 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 PrecisionPower Customer Service at 1-  
800-62-POWER for questions concerning out of warranty repair charges. Repaired unit will be  
returned with an itemized statement, C.O.D.  
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