TM
POWERCLASS
PC6800 Owners Manual
CONTENTS
(Click on a topic to view)
Congratulations
Crossover Settings
Features / Specifications
QBASS PLUSTM
Installation
Inputs
Crossover Operation
Input, Combine, and Gain
Troubleshooting
Troubleshooting
System Diagram 1
System Diagram 2
System Diagram 3
System Diagram 4
System Diagram 5
Block Diagram
Wiring
Wiring (continued)
Power / Ground
Power, Ground and Remote
Speaker Wiring
Bridging
Endplate Diagram
Controls Diagram 1
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Controls Diagram 2
Warranty
FEATURES / SPECIFICATIONS
PWM Switching Power Supply
Fully Complementary Triple Darlington Output Stage
AM IV Protection Circuitry
QBASS PLUS™
QBASS REMOTE™ Compatible
PowerLock Speaker and Power Wire Connectors
Variable, 6-Way Internal Crossover
Non-Fading Sub Channels
Balanced Differential Input Stage
High Voltage Input Capability with Input Attenuation Switch
Gold Plated RCA Input and Output Connectors
Mixed Mono/Stereo Operation
Multiple System Configuration
PSC-221 Input Switching
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
10k Ohms
2 - 8 Ohms
4 - 8 Ohms (Channels 1-4)
2 - 8 Ohms (Channels 5-6)
11 - 15 volts
Input Impedance:
Load Impedance (stereo)
Load Impedance (bridged)
Load Impedance (bridged)
Supply Voltage
Damping Factor
>500
Slew Rate
Idle Current:
>50 V/µS
2.25 Amps
Continuous Output Power
CHANNELS 1/2
50 WRMS x 2 @ 4Ω per channel
100 WRMS x 2 @ 2Ω per channel
200 WRMS x 1 @ 4Ω bridged
CHANNELS 3/4
Dimensions
Length - 25.25"
Height - 2.25"
Width - 8.9"
50 WRMS x 2 @ 4Ω per channel
100 WRMS x 2 @ 2Ω per channel
200 WRMS x 1 @ 4Ω bridged
CHANNELS 5/6
50 WRMS x 2 @ 4Ω per channel
100 WRMS x 2 @ 2Ω per channel
200 WRMS x 2 @ 1Ω per channel
200 WRMS x 1 @ 4Ω bridged
400 WRMS x 1 @ 2Ω bridged
1
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QBASS PLUS™
QBASS PLUS™
™
On POWERCLASS 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 - 30 Hz,
36 Hz, 44 Hz and 60 Hz. 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 QBASS level control and
the plug-in for an optional QBASS REMOTE™ dash
mounted level control. Adjust the level control clockwise
for up to 18dB of boost at your selected frequency and Q.
QBASS PLUS™
Q = 2
QBASS™ Settings
Q = 4
1
IN
IN
2
IN
OUT
IN
Freq.
30Hz
36Hz
44Hz
60Hz
+18dB
+12dB
+6dB
0dB
OUT
OUT
OUT
36Hz
44Hz
30Hz
60Hz
Optional QBASS REMOTE™
This boost control can be mounted
in the dash and will supersede the
boost control on the endplate.
™
TE
REMO
ASS
B
Q
Designed and handcrafted in the USA
Q
B
ASS
™
Optional QPORT™ expansion
module allows one boost control
to operate multiple amplifiers. Each
+18
QPORT™ has outputs for four amplifiers
as well as another QPORT™ for greater
expansion. See your Authorized PrecisionPower
Dealer for more information!
Crossover Specifications
PC PRO 6800
Linkwitz-Riley crossover topology used throughout.
High Pass (Channels 1/2, 12dB/Octave stereo) Fully Variable 20 Hz - 20 KHz.
Band Pass (Channels 3/4, 12dB/Octave stereo) Fully Variable 20 Hz - 20 KHz.
Sub or Band Pass Channels 5/6, (24dB/Octave mono Fully Variable 50 Hz - 500 Hz
Lowpass or 12dB/Octave stereo 20 Hz - 20 KHz Bandpass).
Sub or Band Pass RCA outputs will be the opposite of Channels 5/6 Crossover.
QBASS PLUS™ on Lowpass assigned to Channels 5/6 or RCA OUTPUT.
CAUTION: QBASS PLUS™ should only be used in systems with strong
subwoofers. 18dB is a lot of bass boost and could damage full range speakers.
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
Pro6800
Maximum Fuse Rating
80 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 Pro6800 amplifier has six channels at 50
watts RMS per channel into 4 Ohms (50 x 6 = 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.
Factory Ground wire may
need to be replaced if it is
frayed or broken.
Positive
Battery
Terminal
Fuse must be
installed within
18" of battery
Run signal cables (RCAs)
and remote turn-on lead
down the opposite side of
the vehicle of the power
wire to avoid radiated noise.
Drill a hole in the firewall
and use a rubber grommet
to keep wire from shorting.
eject
1
5
2
6
3
7
4
8
Trk
1
DP
B
A
S
S
TREBLE
B
A
L
A
N
C
E
T
R
A
C
K
P
P
I
M
A
R
K
E
T
I
N
G
T
VOLUME
L
E
F
T
R
I
G
H
T
F
O
W
A
R
D
REVERSE
Run the cables under the
carpet near the side of the
vehicle. Be careful not to
drill or screw into the wires
when you replace the trim.
Avoid sharp edges that
could chafe through the
insulation.
For systems over 300 watts,
add a ground cable from the
amp to the battery
(see page 6).
Firmly attach Amp
Ground Wire to solid
metal (see page 6).
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 300watts), 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 600watts), 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
PrecisionPower technical support 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 Pro6800.
Power/Ground PowerLock
Power wires
Fastening screws
Connect to Amplifier
7
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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 top of the connector and insert the
Channels 5/6 speaker leads into the end. Check to be sure
you've maintained proper polarity before securing each wire.
Speaker PowerLock Connector
Right Speaker negative
Right Speaker positive
Remote turn on
Left Speaker positive
Left Speaker negative
Speaker PowerLock Connector
Right Speaker negative
Right Speaker positive
Left Speaker positive
Left Speaker negative
Speaker/Remote PowerLock
For the front and rear channels, locate the four terminal speaker
PowerLock connectors. On your new Pro6800 PowerClass
Amplifier, all speaker PowerLocks 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 PowerLock connector into the amplifier
with the screws on top.
8
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BRIDGING
Bridging
Any or all pairs of channels (1/2, 3/4 or 5/6) on your
POWERCLASS™ multi channel amplifier are capable of being
bridged into a 4 ohm mono output without switches or bridging
modules (2 ohm mono on Channels 5/6). 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 of the pair as the positive speaker wire
and the right channel negative wire as the negative speaker
wire. You should always be working with the wires of a single
POWERLOCK speaker connector when bridging a pair of
channels.
NOTE: It is important that a minimum 4 ohm impedance is
observed (2 ohm mono on Channels 5/6). If the impedance
drops significantly below 4 ohms while the amplifier is wired
in the bridged configuration, the amplifier's protection
circuitry may engage.
Mixed Mono Output
The ability to run stereo speakers while simultaneously running
a mono output from the same channel pair 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). Total 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.
9
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ENDPLATE DIAGRAM
Pro6800
1. Q SELECT 4/2
Push this button in for a Q setting of 4 and out for a setting of 2.
2. QBASS 1
Use this switch with the QBASS 2 to program the QBASS PLUS™ circuit. (see page 2).
3. QBASS 2
Use this switch with the QBASS 1 to program the QBASS PLUS™ circuit. (see page 2).
4. COOLING VENTS (see page 16).
5. SPEAKER/REMOTE CONNECTOR
After connecting remote and speaker wires, plug in the PowerLock
connectors here (see pages 7-9).
6. -12dB
For use with high level inputs (4V up to 12V). Push this switch
in to attenuate the input by 12dB (see page 14).
7. INPUTS A
Plug in the Front RCA leads from your head unit here (see page 14 & 16).
8. INPUTS B
Plug in the Rear RCA leads from your head unit here (see page 14 & 16).
9. OUTPUTS
Left and Right RCA outputs provide band pass or mono low pass signal to another amplifier.
10. POWER / MUTE indicator
A green light indicates that the amplifier is on, a red light indicates that the amplifier's
muting circuits have been engaged by an ACM-420.
11. QBASS™ Level
Turn this control clockwise to boost the QBASS PLUS™ circuit by up to 18dB.
12. QBASS REMOTE™ plug in
Plug in the data cable from the optional QBASS REMOTE™ dash mount level control here.
(This will bypass the amplifier's on board QBASS™ control)
13. POWER / GROUND POWERLOCK
After you have securely connected your power and ground wires, plug in the
Power / Ground POWERLOCK connector here.
3
1
2
4
5
CHANNELS 1 / 2
L - L + R + R -
CHANNELS 3 / 4
L - L + R + R -
CHANNEL 5 / 6
L - L + R E M R + R -
1
2
Q SELECT 4/2
-12dB
QBASS
INPUTS
INPUTS B
OUTPUTS
A
L
R L
R L
R
7
8
9
4
6
10
PC PRO 650 12/13/96
POWER / MUTE
Designed and Handcrafted in the U.S.A.
QBASS
0
+18
QBASS
+
-
REMOTE
13
11
12
10
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CONTROLS DIAGRAM
ONE
11
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CONTROLS DIAGRAM
TWO
I
I
I
I
I
I
I
I
I
I
I
I
12
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CROSSOVER SETTINGS
All 12dB/octave 20Hz - 21KHz
24dB/octave mono LowPass
HighPass and BandPass
Position Frequency
Position X1-Out
X10 - In
220 Hz
1
20 Hz
1
52 Hz
2
20 Hz
220 Hz
2
52 Hz
3
20 Hz
220 Hz
3
54 Hz
4
20 Hz
220 Hz
4
56 Hz
5
21 Hz
222 Hz
5
56 Hz
6
22 Hz
240 Hz
6
60 Hz
7
23 Hz
255 Hz
7
64 Hz
8
25 Hz
276 Hz
8
68 Hz
9
28 Hz
299 Hz
9
73 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
31 Hz
34 Hz
38 Hz
43 Hz
50 Hz
59 Hz
70 Hz
80 Hz
324 Hz
360 Hz
401 Hz
452 Hz
521 Hz
609 Hz
712 Hz
836 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
78 Hz
85 Hz
92 Hz
102 Hz
113 Hz
127 Hz
144 Hz
158 Hz
168 Hz
175 Hz
183 Hz
191 Hz
200 Hz
210 Hz
221 Hz
234 Hz
246 Hz
260 Hz
277 Hz
295 Hz
315 Hz
337 Hz
362 Hz
382 Hz
396 Hz
410 Hz
422 Hz
431 Hz
438 Hz
444 Hz
450 Hz
450 Hz
87 Hz
94 Hz
99 Hz
916 Hz
976 Hz
1.04 KHz
1.12 KHz
1.21 KHz
1.30 KHz
1.42 KHz
1.59 KHz
1.77 KHz
2.00 KHz
2.28 KHz
2.67 KHz
3.17 KHz
4.00 KHz
5.11 KHz
6.50 KHz
8.10 KHz
10.04 KHz
12.75 KHz
15.45 KHz
18.45 KHz
20.00 KHz
21.00 KHz
21.00 KHz
107 Hz
117 Hz
128 Hz
140 Hz
155 Hz
173 Hz
193 Hz
220 Hz
255 Hz
310 Hz
385 Hz
492 Hz
608 Hz
744 Hz
936 Hz
1.19 KHz
1.45 KHz
1.77 KHz
2.08 KHz
2.10 KHz
2.10 KHz
13
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INPUTS
There are two sets of RCA INPUTS on the front end of your
amplifier. Plug the RCA cables from your head unit into the
appropriate set of inputs, front and rear. 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 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
14
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CROSSOVER Operation
Your new POWERCLASS™ amplifier has crossover circuits built-in to
provide exceptional system flexibility without the added expense and
installation of an outboard crossover.
CHANNELS 1/2
The first row of controls on the top of your Pro6800 allow you
to send a variable highpass signal (20 Hz to 20 KHz) to
Channels 1/2. (12dB/octave) With the X10 switch in the "out"
position, crossover adjustment can be made by turning the
highpass dial up or down for crossover points between 20 Hz
and 2000 Hz. By pressing the X10 switch "in" you are able to
make crossover adjustments between 200 Hz and 20 KHz. A
separate gain control is designated for these channels and
should be adjusted according to page 16.
CHANNELS 3/4
The second row of controls on the top of your Pro6800 allow
you to send a variable highpass or bandpass signal (20 Hz to
20K Hz) to Channels 3/4. These controls operate in the same
fashion as above. The first set of controls are the highpass
side of the bandpass, and the second set of controls are the
lowpass side of the bandpass. In order to get a full highpass to
20 KHz press the second X10 switch in and turn the second
(lowpass) dial fully clockwise to 20 KHz position.
CHANNELS 5/6
The third row of controls on the top of your Pro6800 operate in
the same fashion as Channels 3/4 crossovers. However, you
have one more option on these channels: you can select a
bandpass crossover (bandpass 2 - third row) or lowpass (fourth
row). By leaving the LP/BP switch out the bandpass 2 signal
will be assigned to CHANNEL 5/6 and lowpass assigned to the
RCA outputs.By pressing the LP/BP switch in, the lowpass
(fourth row) will be assigned to CHANNEL 5/6 and bandpass 2
assigned to the RCA OUTPUTS. The lowpass dial can be
adjusted from 50 Hz to 500 Hz and provides a 24dB/octave
slope.
15
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INPUT COMBINE and GAIN
Input Combine
Your multi channel POWERCLASS™ 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 COMBINE switch
on the amplifier end plate to route the INPUT A signal to
channels 3/4 as well.
PSC Switch
Channels 5/6 will be used as subwoofer channels in most
cases, and therefore receive summed information from Inputs
A and B. This allows Front/Rear fading without affecting the
subwoofer level. In order to use a PSC-221 phase shift
controller on bandpassed midrange drivers (Channel 3/4)
without causing cancellation in your subwoofer channels, you
can isolate Inputs B to Channel 3/4 only by pushing the PSC
switch 'IN'.
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.
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.
16
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TROUBLE SHOOTING
NO SOUND
Is the LED lit?
YES
RED
NO
Check Power and Remote turn-
on wire for voltage. Make sure
Ground wire is secure.
WHAT COLOR ?
GREEN
Substitute RCA inputs with
another source, and connect a
known good speaker to one
channel.
Central Muting is engaged.
Remote turn-on wire must have
more than 8 volts to release
central muting. Check Remote
turn-on at the head unit. You may
need to install a relay if the head
unit doesn't put out sufficient
voltage.
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
SAME CHANNEL
Problem is in the speaker or
speaker wire of the silent
channel.
OPPOSITE CHANNEL
Reverse RCA inputs
SOUND IS NOW IN
SAME CHANNEL
OPPOSITE CHANNEL
Reverse RCAs at head unit
Problem is in the Amp. See your
local Authorized PrecisionPower
Dealer or call 1-800-62POWER.
SOUND IS NOW IN
OPPOSITE CHANNEL
SAME CHANNEL
Problem is in the head unit Problem is in the RCA cables
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TROUBLE SHOOTING
NO SOUND ON BANDPASS CHANNELS
Be sure that crossover points are
set properly. Is the highpass set
at a higher frequency than the
lowpass or the lowpass set lower
than the highpass, creating a no
pass?
YES
NO
Readjust crossovers and then
test system again.
Check speaker wiring for short
circuits or loose connections. Be
sure that powerlock plugs are in
place properly (screws facing up)
and observe correct wiring
diagram.
STILL NO SOUND - See your Authorized PrecisionPower
Dealer or Call 1-800-62POWER.
NO SOUND IN BRIDGED MODE
Check speaker wiring for short circuits or loose connections. Be
sure that powerlock plugs are in place properly (screws facing up)
and observe correct wiring diagram.
AMPLIFIER TURNS DOWN
Both excessive temperature and low impedance (or short circuit)
conditions will activate the amplifier'sAM 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.
18
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BACK TO CONTENTS
SYSTEM DIAGRAM
ONE
Source
eject
1
2
3
4
Trk 1
5
6
7
8
BASS
TREBLE
BALANCE
TRACK
P
P
I
M
A
R
K
E
T
I
N
G
D
P
T
VOLUME
LEFT
RIGHT
FOWARD
REVERSE
Input
Sensitivity
R
Input
L
R
Output
L
Precision
Power
PEQ-114
Power
Volume
Power
+
PEQ-114
DEQ-230
Made in USA
PEQ-114
+
Sub
+
+
Te
USA
M
a
d
e
i
n
1
2
.
8
KHz
+
12db
6
.
4
KHz
T
hird Octave
E
qualizer
2
1
6
KHz
+
12db
+
12db
3
.
2
KHz
-
1
2
db
8
K
Hz
2
+
12db
2
0
K
H
z
+
12db
1
.
6
K
H
z
+12db
-12db
4
K
Hz
-b
+
1
2
db
1
0
K
H
z
-12db
+
12db
8
0
0
Hz
-
1
2
db
+12db
2
K
H
z
-12db
+
12db
5
KHz
-12db
4
00
Hz
+12db
+12db
1
K
Hz
-12db
+
12db
-12db
2
00
H
z
+
1
2
db
2
.
5
K
H
z
-
12b
+
12db
5
0
0
H
z
-12db
+
12db
1
0
0
H
z
-12db
-
1
2
db
+
1
2
db
1
.
2
7
K
H
z
+
12db
+
1
2
db
2
5
0
H
z
-12db
50
Hz
-
1
2
db
+
1
2
db
6
3
5
H
z
-12db
+
1
2
db
1
2
6
H
z
+12db
-12db
2
5
Hz
Power
Precision
2
+
1
2
db
-12db
3
2
0
H
z
+
12db
6
3
Hz
-
12db
+12db
DEQ-230
2b
+
1
2
db
1
5
6
H
z
-12db
Power
3
1
.
5
H
z
-
1
2
db
+12db
+
12db
-12db
8
0
H
z
2
b
+12db
4
0
H
z
-12db
+
12db
EQ
-12db
Defeat
Input
R
stereo
mono
•
out
in
•
Output
L
Ground
Remote
L
Power
R
Pro6800
Q
B
1
ASS
2
L
-
L
+
R
+
R
-
Q
B
ASS
INPUTS
A
L
-
L
+
R
+
R
-
L
-
L
+
R
E
M
R
+
R
-
L
R
L
R
L
INPUTS
R
B
OUTPUTS
Channel 1
HighPass
Channel 2
HighPass
Channel 3
Highpass
Channel 4
Highpass
Channel 5/6 Lowpass
Subwoofer
Subwoofer
Basic System Layout
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SYSTEM DIAGRAM
TWO
Source
eject
1
2
3
4
Trk 1
5
6
7
8
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
R
Input Sensitivity
Rear
Output
L
R
Front
Output
L
LED Select
1
Power
2
Frequency Adjust
3
4
Sub
Precision
PAR-245
Volume
Power
Low
Power
In-Cl
Low-Mid
F
High-Mid
R
PAR-245
DEQ-230
Treble
+
Made in USA
+
at
+
u
+
+
le
PAR-245
PSC-221
USA
M
a
d
e
i
n
1
2
.
8
KHz
+
12db
6
.
4
KHz
T
hird Octave
E
qualizer
-
1
2
db
1
6
KHz
USA
+
12db
+
12db
3
.
2
KH
z
Phase
S
hift Control
-12db
8
K
Hz
Made in
-12db
+
12db
2
0
K
H
z
+
12db
1
.
6
K
H
z
+12db
-12db
4
K
Hz
-
1
2
db
600
+
1
2
db
1
0
K
H
z
1
d
220
+
12db
8
00
H
z
o
2
+
12db
100
2
K
H
z
-12db
+
12db
5
KHz
1d
-ø
4
00
H
z
+12db
-
2
b
+
12db
Right Phase
1
K
Hz
-12db
+
1
2
db
Power
-
2
0
0
H
z
+
1
2
db
2
.
5
K
H
z
Power
-
12db
+
12db
5
0
0
H
z
-12db
+
1
2
db
600
Precision
PSC-221
220
10
0
Hz
1d
-
1
2
db
+
1
2
db
1
.
2
7
K
H
z
o
+
1
2
db
100
+
1
2
db
2
5
0
H
z
-12db
5
0
Hz
-
1
2
db
+
1
2
db
6
3
5
H
z
-ø
Left Phase
+
1
2
db
1
2
6
H
z
+12db
-12db
2
5
Hz
Power
1
db
+
1
2
db
2
3
2
0
H
z
+
12db
Precision
DEQ-230
63
Hz
2
+12db
-
12db
+
1
2
db
1
5
6
H
z
2b
Power
3
1
.
5
H
z
b
+12db
Input
+
12db
b
8
0
H
z
ByPass
L
Power
Precision
L
1
d
+12db
Invert
L
4
0
H
z
1d
ByPass
+
12db
R
EQ
Invert
2
b
R
in
•
R
Defeat
Non-inverte
out
•
Inverted
/
Ground
Active
Remote
ByPass
Power
Input
R
stereo
mono
•
out
in
•
Output
L
Ground
Remote
L
Power
R
To Inputs B
To Inputs A
Pro6800
Q
B
1
ASS
2
L
-
L
+
R
+
R
-
Q
B
ASS
INPUTS
A
L
-
L
+
R
+
R
-
L
-
L
+
R
E
M
R
+
R
-
L
R
L
R
L
INPUTS
R
B
OUTPUTS
Channel 1
HighPass
Channel 2
HighPass
Channel 3
BandPass
Channel 4
BandPass
Channel 5/6 Lowpass
Subwoofer
Subwoofer
System Layout Using PSC Switch
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BACK TO CONTENTS
SYSTEM DIAGRAM
THREE
Source
eject
1
2
3
4
Trk 1
5
6
7
8
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
Input
L
R
Input Sensiiiy
Rear
Output
L
R
Front
Output
L
LED Select
1
Pow
er
2
Frequency Adjust
3
4
Sub
Precision
PAR-245
Volume
Power
Low
Pow
In-Cl
Low-Mid
F
High-Mid
R
PAR-245
Treble
+
r
Made in USA
+
Defeat
+
+
w
+
-
id
r
PAR-245
Q
B
1
ASS
2
RCA Output Bandpass
12dB/Octave
Pro6800
L
-
L
+
R
+
R
-
Q
B
ASS
INPUTS
A
L
-
L
+
R
+
R
-
L
-
L
+
R
E
M
R
+
R
-
L
R
L
R
L
INPUTS
R
B
OUTPUTS
PC AMP
Channel 1
HighPass
tweeter
Channel 2
HighPass
tweeter
Channel 3
BandPass
Midrange
Channel 4
BandPass
Midrange
MidBass
MidBass
4Ω SUB
4Ω SUB
Channel 5/6 Lowpass
Sub Woofers 24dB/Octave
Four-Way System Layout with MidBass Amp
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SYSTEM DIAGRAM
FOUR
Source
eject
1
2
3
4
PSC-221
Trk 1
5
6
7
8
BASS
TREBLE
BALANCE
TRACK
P
P
I
M
A
R
K
E
T
I
N
G
D
P
T
VOLUME
LEFT
RIGHT
FOWARD
REVERSE
USA
Phase
S
hift Control
Made in
600
220
o
100
-ø
Right Phase
Power
Power
600
Precision
PSC-221
220
14KHz-23.37
H
o
100
9.37KHz-15.75KHz
Q
-ø
H
Left Phase
4
L
4KHz-9.37KHz
Q
H
Cut / Boost
4
L
+12db
1.95KHz-4.5Khz
Q
1.5
H
-
1
2
db
USA
Cut
/
Boost
Input
L
4
Made in
L
+
1
2
db
ByPass
Power
940Hz-1.25KHz
Q
L
1.5
H
Invert
-
1
2
db
L
Cut / Boost
4
Precision
+
12db
ByPass
330Hz-1KHz
R
Q
1.5
H
10 Band
P
arametric
Equalizer
Invert
-
1
2
db
R
4
Cut / Boost
in
•
R
160Hz-550Hz
+12db
Q
Noinverte
1
H
out
•
-12db
4
Cut
/
Boost
Inverted
Ground
L
80Hz-260Hz
+
12db
Activ
Remote
Q
Power
ByPass
H
4
Cut
/
Boost
-12db
L
40Hz-130Hz
Q
+12db
1.5
H
4
-
Cut / Boost
L
20Hz-70Hz
Q
+12db
1.5
H
4
-12db
Cut / Boost
Q
+12db
1.5
Power
er
Pow
4
-12db
Cut / Boost
1
+12db
Precision
PMQ-210
-db
Cut
/
Boost
+
12db
EQ
-12db
Defeat
Power
Precision
Input
R
attenuation
-12dB in
Output
To Inputs B
stereo•out
mono•in
L
PMQ-210
R
L
Ground
Remote
Power
To Inputs A
Q
B
1
ASS
RCA Output Lowpass
24dB/Octave
2
L
-
L
+
R
+
R
-
Q
B
ASS
L
-
L
+
R
+
R
-
Pro6800
INPUTS
A
L
-
L
+
R
E
M
R
+
R
-
L
R
L
R
PC AMP
L
INPUTS
R
B
OUTPUTS
Channel 1
HighPass
tweeter
Channel 2
HighPass
tweeter
Channel 3
BandPass
Midrange
Channel 4
BandPass
Midrange
Channel 5
BandPass
MidBass
Channel 6
BandPass
MidBass
8Ω SUB
8Ω SUB
Four-Way System Layout using a separate PC amp for Subs
22
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SYSTEM DIAGRAM
FIVE
Source
eject
1
2
3
4
Trk 1
5
6
7
8
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
Inpu
t
L
R
Input Sensitivty
Rear
Output
L
R
Front
Output
L
LED Select
1
Power
2
Frequency Adjust
3
4
Sub
Precision
PAR-245
Volum
Power
Low
Power
Inl
Low-Mid
F
High-Mid
R
PAR-245
Treble
+
Made in USA
+
feat
+
+
+
d
-id
l
PAR-245
14KHz-23.37KHz
H
9.37KHz-15.75KHz
Q
H
4
L
4KHz-9.37KHz
Q
1
H
Cut / Boost
4
L
+12db
1.95KHz-4.5Khz
Q
H
-
1
2
db
USA
Cut / Boost
4
Made in
L
+12db
940Hz-1.25KHz
Q
1.5
H
-12db
Cut / Boost
4
L
+12db
330Hz-1KHz
Q
1.5
H
10 Band
Parametric Equalizer
-
4
Cut / Boost
160Hz-550Hz
+12db
Q
1.5
H
-12db
4
Cut / Boost
L
80Hz-260Hz
+12db
Q
H
4
Cut
/
Boost
-12db
L
40Hz-130Hz
Q
+12db
1.5
H
4
-
1
Cut / Boost
L
20Hz-70Hz
Q
+12db
1.5
H
4
-
1
2
db
L
Cut / Boost
Q
+
12db
1.5
Power
4
-12db
Cut / Boost
Power
Precision
PMQ-210
1
+12db
-2
Cut
/
Boost
+
12db
EQ
Right
-
12db
Defeat
er
Pow
Precision
Input
attenuation
-12dB in
Output
PMQ-210
stereo•out
mono•in
L
R
L
R
Ground
Remote
Power
Left
Y-cords
Y-cords
Pro6800
Pro6800
Q
B
1
ASS
2
Q
B
1
ASS
2
L
-
L
+
R
+
R
-
L
-
L
+
R
+
R
-
Q
B
ASS
INPUTS
A
L
-
L
+
R
+
R
-
Q
B
ASS
L
-
L
+
R
+
R
-
INPUTS
A
L
-
L
+
R
E
M
R
+
R
-
L
L
-
L
+
R
E
M
R
+
R
-
R
L
R
L
R
L
R
L
INPUTS
R
L
B
INPUTS
OUTPUTS
R
B
OUTPUTS
Right Front
HighPass
Left Front
HighPass
200W bridged
Channels 1/2
200W bridged
Channels 1/2
Left Rear
HighPass
Right Rear
HighPass
200W bridged
Channels 3/4
200W bridged
Channels 3/4
4Ω SUB
4Ω SUB
4Ω SUB
4Ω SUB
2Ω 400W bridged Channels 5/6
2Ω 400W bridged Channels 5/6
Two Pro6800 Amps bridged for Left and Right channels
23
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BACK TO CONTENTS
BLOCK DIAGRAM
Pro6800
BSA
PULS
Q
BSARMOTE
Q
INPUT ATTENUATION
MUTE
24
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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. 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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