Precision Power A1002 User Manual

ArtSeries Amplifiers  
Owner's Manual  
A100.2 / A200.2 / A300.2  
A600.2 / A1200.2  
A204.2 / A404.2  
7402 W. Detroit Street Suite 180  
Chandler, AZ 85226  
1-800-62-POWER  
Designed and Handcrafted in the USA  
Table of Contents  
Important Safeguards  
The following list of 'Important Safeguards has been compiled to help you achieve optimum satisfaction and  
the highest quality performance from your new mobile audio amplifier. Please take the time to review these  
safeguards before operation and or installation of your new Art Series amplifier.  
Glossary of Terms  
Features  
4
5
Read Instructions  
We all have a tendency to read instructions only after something doesn't work as anticipated. This manual  
provides specific information concerning the operation and installation of your new amplifier. Please read  
this manual thoroughly and retain it for future reference.  
Specifications  
6
Keep Your Sales Receipt  
Your PPI amplifier has a three-year limited warranty when it is installed by an Authorized PPI dealer. Non-  
Authorized dealer installed (PPI) amplifiers carry a one-year parts / ninety days labor limited warranty. To  
establish the starting date of warranty coverage, a copy of your sales receipt must accompany your amplifier  
for all warranty service. Please file your sales receipt away for future reference. For your convenience, a  
complete limited warranty statement is located at the back of this manual.  
About Your Art Series Amplifier  
Installation  
7
11  
15  
17  
18  
20  
Follow Instructions  
System Tuning  
All use and installation instructions should be followed to assure proper operation of your new Art Series  
amplifier.  
Troubleshooting  
System Designs  
Heed All Wiring Requirements  
A high-performance amplifier requires minimum wire gauges be used for the Power, Ground, Remote Tum-  
On, and Speaker cables. To assure proper operation of your Art Series amplifier, following all wiring  
requirements.  
Limited Warranty  
Heed all Fusing Requirements  
The fusing requirements of your Art Series amplifier have been established for its continued safe operation.  
Replacement with a higher value fuse may result in damage and voiding of warranty.  
Installation Accessories  
The Art Series amplifiers will require non-supplied installation accessories. Please refer to the Installation  
Section of this manual for a list of requirements or consult your Authorized PPI dealer before installation.  
Water and Moisture  
Never mount your Art Series amplifier in a location which would subject it to immersion or exposure to water.  
Servicing  
PPI  
Do not attempt to service this amplifier yourself. Opening or removing covers will void your warranty. For  
service information, consult your Authorized PPI dealer or call PrecisionPower, Inc. at 1-800-62-POWER.  
Our customer service representatives are available Monday through Friday from 8am to 5pm Mountain  
Standard Time.  
Caution!  
The use of a high-powered audio system may cause hearing loss or damage. While PPI  
systems are capable of "Concert level" volumes with incredible accuracy, they are  
designed for you to enjoy the subtleties created by musicians while listening at  
reasonable sound pressure levels. The use of a high powered audio system may impair  
your ability to hear traffic sounds, and therefore, may constitute a traffic hazard. We  
advise lower volume levels while driving.  
Features  
Glossary  
A100.2 / A200.2 / A300.2  
A600.2 / A1200.2 / A404.2 / A204.2  
The following terms are used in this manual. Since they may be unfamiliar, the  
following definitions are provided.  
AM II  
Adaptive MOSFET II is an advanced protection circuit  
designed to prevent amplifier shut-off due to low load imped  
ance. AM III optimizes output power to maintain uninterrupted  
operation whenever the amplifier senses a load impedance of  
less than two Ohms. An L. E. D. signals when AM II is working.  
Pulse-Width Modulated (PWM) Switching Power Supply for High-Efficiency  
Regulated Power Supply Provides Full Rated Power from 11 - 15 VDC  
Discrete Power Amp Circuitry  
-
Internally Bridgeable  
Bridging:  
Gain:  
Combining two amplifier channels into one channel, typically  
used to create a mono output.  
Mixed Stereo / Mono Operation  
The ratio of output voltage to input voltage. The gain control  
allows adjustment to the amplifier's output level for varying  
input levels.  
Output Short Circuit Protection  
Differential Input Stage  
Light Emitting Diode. Indicates power on / off and when AM II  
is working.  
L.E.D.:  
Low Impedance Protection with Diagnostic L.E.D.  
Adjustable Input Sensitivity  
Load Impedance:  
Measurement of speaker(s) resistance / reactance that the  
amplifier must drive.  
Gold RCA Input Connectors  
The amplifier's ability to play the Left and Right Stereo channels  
while playing a third (bridged) mono channel.  
Mixed Mono:  
PWM  
PPI's Exclusive Wire Connection System  
Liquid Cooling (Optional)  
Pulse-Width Modulated power supply. Our PWM maintains a  
regulated output voltage and a high conversion efficiency over  
the input supply range of 11 - 15 VDC. The result is less demand  
on the battery, lower (amplifier) operating temperature, and  
extremely accurate low frequency reproduction.  
Amplifier Control Module Compatible (Optional ACM-420)  
Three Year Limited Warranty  
Low current automatic switching circuit that turns the amplifier  
on and off. Typically connected to the remote antenna or amp  
turn-on lead of most car radios, cassette, or CD players.  
Remote Turn-On:  
ACM  
Designed and Handcrafted in the USA  
Amplifier Control Module. Our ACM-420 (optional) controls up  
to ten PPI amplifiers for synchronized system start and "noise  
gate" functions to inhibit background noise when no music  
signal is present  
About your New Art Series Amplifier  
Technical Specifications  
As a world leader in the design and manufacture of high-performance mobile amplifiers,  
PrecisionPower, Inc.'s commitment to being: “Absolutely Start of the Art” demands that  
we create products that offer high reliability and superior sound quality. To do this, we  
must recognize and find solutions to the unique problems, which affect the performance  
of electronics in the mobile environment.  
Art Series Model:  
A100.2  
A200.2  
A300.2  
A600.2  
A1200.2  
Continuous Power Output per Channel:  
25 Watts  
50 Watts  
100 Watts  
20 Amp  
50 Watts  
100 Watts  
200 Watts  
20 Amp  
75 Watts  
150 Watts  
300 Watts  
150 Watts  
300 Watts  
600 Watts  
300 Watts  
600 Watts  
1200 Watts  
4 Ohms, 11-15 VDC, Stereo:  
2 Ohms, 11-15 VDC, Stereo:  
At PPI, we build upon experience. We currently design and manufacture over 20  
different amplifiers. Each is designed to be application specific, either in rated power,  
number of channels, or with integrated accessories. This large reservoir of knowledge  
has provided us with the innovative design solutions incorporated in the Art Series  
Amplifiers.  
4 Ohms, 11-15 VDC,  
Power Fuse:  
Bridged:  
30 Amp  
2x9.25x10.6”  
8 lbs.  
40 Amp  
2x9.25x14”  
9 lbs.  
100 Amp  
2x9.25x24"  
14 lbs.  
Dimensions (inches):  
Shipping Weight:  
2x9.25x6” 2x9.25x8.5”  
6 lbs.  
7 lbs.  
As you review this section, keep in mind that the new features found in the Art Series  
amplifiers directly influence their performance and, therefore, must be understood before  
operation and / or installation. Please take a few minutes to review the following  
information. The user benefit and operational parameters of the 'key' design features are  
detailed below.  
4-Channel Model:  
A204.2  
A404.2  
Continuous Power Output per Channel, x 4 Stereo, x2 Bridged  
4 Ohms, 11-15 VDC, Stereo:  
2 Ohms, 11-15 VDC, Stereo:  
4 Ohms, 11-15 VDC, Bridged:  
Power Fuse:  
25 Watts  
50 Watts  
100 Watts  
20 Amp  
50 Watts  
100 Watts  
200 Watts  
50 Amp  
Pulse- Width Modulated (PWM) Switching Power Supply  
The voltage supplied by an automobile's electrical system will vary depending upon the  
number of accessories you are using. As you turn on / off various accessories (head-  
lights, air conditioner, rear window defroster, power windows, etc) the voltage that your  
car's electrical system is providing will change according to the demand. The Art Series  
fully regulated power supply guarantees rated spec over a wide range of voltages (11  
VDC to 15 VDC).  
Dimensions (inches):  
Shipping Weight:  
2x9.25x10"  
7.5 lbs.  
2x9.25x13"  
8.5 lbs.  
Our PWM supply offers high-efficiency. This efficiency translates into cooler operation.  
The hostile environment of mobile audio presents a real problem for an amplifier to  
operate properly. When an amplifier is running, it develops heat It is the job of the  
heatsink to pull this heat away from the internal components. If the heatsink gets too hot,  
the amplifier will modify its operation to protect itself from damage. The amplifier's ability  
to maintain a proper operating temperature is oftentimes aggravated by the conditions  
(ambient air temperature, mounting location, playing level, duration of operation, as well  
as the load impedance) presented by the auto-sound environment. The Art Series PWM  
power supply's high-efficiency means lower operating temperatures and a higher  
tolerance for thermal control. The temperature protection circuit will engage at 75  
degrees Celsius.  
Common Specifications:  
Power Bandwidth:  
10 Hz -50 kHz  
.02%  
Total Harmonic Distortion:  
Input Sensitivity:  
.2 - 2.5 V  
Input Impedance:  
10k Ohms  
2 - 8 Ohms  
4 - 8 Ohms  
11 - 15 Volts  
Load Impedance (Stereo):  
Load Impedance (Bridged):  
Supply Voltage:  
Heatsink Design  
To understand why PPI created this unique heatsink design, it's important to understand  
what purpose a heatsink serves and how it works.  
When an amplifier operates, the internal components develop heat. This heat must be  
transferred away from the components for them to operate properly. By securing the  
components to the underside of the heatsink, the process of conduction transfers  
Engineers have recognized the importance of radiant surface area, but the constraints of  
the automotive environment have forced heatsink designs to remain compact. In order to  
improve radiating efficiency, designers have simply added more fins. With limited space,  
adding more fins means that they get closer together What PPI's engineers observed  
was that fins in close proximity radiate heat from fin to fin rather than into the  
the heat from the components to the heatsink. The heatsink, in turn, must dissipate this  
heat or become too hot for the internal components to operate properly. The heat can be  
transferred from the heatsink by three different processes: Conduction, Radiation, or  
Convection.  
environment. If convection is not available to draw the heat out from between the fins,  
the heat becomes trapped, causing a reduction in radiant heat transfer efficiency.  
Conduction is defined as the process by which heat is transferred through matter,  
without transfer of the matter itself A practical example of this would be the cooling  
system in your car which circulates a liquid (matter) in order to transfer the heat away  
from your engine.  
The Art Series heatsink addresses this problem and improves radiant heat transfer  
efficiency by providing more effective radiating surface area. Combined with our highly  
efficient (less wasted energy in the form of heat) PWM power supply, the result is an  
amplifier with improved thermal capabilities.  
In the mobile environment, conduction is not the primary process of transferring heat  
from the heatsink. The use of a circulating liquid or gas is impractical, unless specific  
provisions were made in the design of a heatsink to accomodate this type of transfer.  
There is nothing in the vehicle which could easily be used to heatsink the heatsink. Air is  
the only (practical) conductive (heat transfer) medium involved when you install an  
amplifier in your car. As we will discuss later, heat radiated by the heatsink is conducted  
out into the environment, triggering the process of convection.  
As with any amplifier, care must be taken when selecting a mounting location. There  
must be two inches of air space around the heatsink for proper heat dissipation to take  
place. If mounting in an enclosed area, a fan may be added to improve heat transfer.  
Refer to the Section on Installation for more information.  
Radiation is defined as the process of giving out light, heat, or other radiant energy. An  
example of this process would be the sun. It radiates heat, light, and other radiant  
energy.  
Central Muting and the ACM-420  
One of the accessories that we at PPI offer the discerning audiophile is the amplifier  
control module (ACM), commonly known as a "noise gate". The ACM eliminates  
annoying and possibly damaging start-up noise (such as "clicks" and "pops") by  
sensing signal voltage changes and blocking the signal when there is no music pre-  
sent, such as between CD tracks. We highly recommend the addition of an ACM -  
420 to any high performance audio system.  
Radiation is the primary process of heat transfer for a heatsink. As the conducted heat  
builds (from the internal components), it radiates from the surface out into the  
surrounding environment. The amount of heat radiated by the heatsink is determined by  
its surface area. The traditional way to add surface area is to use fins, expanding the  
radiating surface without increasing the overall dimensions of the amplifier.  
The addition of central muting to the ArtSeries amplifiers allows muting to be con-  
trolled throughout the system by the ACM. Upon system start, the muting feature is  
activated. After a set time interval, the muting is turned off.  
So why doesn't the Art Series heatsink employ the traditional use of fins since it must  
adhere to the same rules of thermodynamics that all other heatsinks do? We must  
discuss the third process - convection before the answer will become clear.  
Convection is defined as the transfer of heat from one place to another by the movement  
of heated particles of a gas or liquid. An example of this process would be warming your  
hand by holding it in the hot air rising from an oven.  
The power L.E.D. at the front of the amplifier also shows whether or not the system  
is muted. When the amplifier is activated, the power lamp will be red to indicate mut-  
ing. After the muting is turned off, the lamp will turn green to indicate normal opera-  
tion.  
When an amplifier's heatsink becomes warm, it conducts heat out into the surrounding  
environment, warming the air. The warm air begins to rise, creating air currents which  
draw heat away from the heatsink. With a traditional finned heatsink, this process is  
most effective when the amplifier is mounted on its vertical axis. As with chimney, the air  
circulates upward, over the fins, improving the heat transfer process.  
If an external ACM is added to the system, the ACM remote output signal can be  
connected to the amplifier remote to mute the system during periods of low or no  
signal to inhibit background noise. The ACM-420 may be installed to control up to  
ten PPI amplifiers, offering the additional benefit of synchronized system restart.  
Your ability to take advantage of convection is limited by the installation constraints  
imposed by the mobile environment. Mounting an amplifier on the vertical axis is not  
always possible and generally, not preferred (by the consumer). The amplifier's heatsink  
is left with only one primary process for heat transfer - radiation.  
AM III Protection Circuitry  
All ArtSeries amplifiers utilize a highly-efficient, Pluse-Width Modulated power sup-  
ply. This means the amplifier will continue to oeprate within regulation until the bat-  
tery voltage drops below 11 volts or the heatsink temperature reaches 70 degrees  
Celsius (158 degrees Fahrenheit). This new power supply also incorporates the sec-  
ond generation of PPI's Adaptive MOSFET protection circuitry.  
The advanced protection circuit  
was developed to prevent shut-  
off due to the fluctuating imped-  
ance loads presented by today's  
complex speaker systems. The  
adaptive circuit optimizes output  
power to maintain uninterrupted  
operation whenever the amplifi-  
er senses an impedance load of  
less than 2 ohms. A low imped-  
ance indicator (Diagnostic  
L.E.D. ) is provided to let you  
know when the amplifier is oper-  
The ArtSeries amplifiers are capable of operation into a two Ohm load in a stereo  
configuration and a four Ohm load in a bridge mono configuration. However, for  
optimum performance a four Ohm load in stereo and an eight Ohm load in mono are  
recommended. Refer to the Section on System Design for more information.  
Watts  
100  
50  
PPI's Exclusive Wire Connection System  
Over the years, advances in mobile audio electronics have changed the demands  
placed on the type and size of wire needed to create a high-performance mobile audio  
system. To meet this need, PPI has created an exclusive wire connection system. This  
unique, removable connection system offers the versatility of terminal strips, the  
convenience of quick connect / disconnect style connectors, and the reliability afforded  
by direct connection to the circuit board. The power and ground connector will accept  
cable up to 6 gauge in size. The speaker/ remote tum-on connector will accept cables up  
to 10 gauge in size. Refer to the Section on Installation for more information.  
25  
Ohms  
8
4
2
1
0.5  
Figure A: AM II Protection Circuitry  
Output Power vs. Impedance  
ating in this mode. It is important  
to note that there is no increase in output power below the 2 Ohm threshold.  
Maximum power is achieved at 2 Ohms. AM III provides you the satisfaction of know-  
ing that your ArtSeries amplifier will continue to play when momentary impedance  
dips occur. (Refer to figure A)  
Fusing  
The Art Series amplifier is protected from current over-load situations by a blade fuse  
(Maxi - Fuse ). This type of fuse has a number of advantages. First it's available in  
higher values, and its single element design is more effective than using two fuses of  
lower value. Second, we could board mount it. This eliminates the use of ‘jumperwires’  
(from the end-panel to the circuit board) which improves reliability. Finally, they are  
readily available from any auto-supply store and are easy to service. The A100 & A200  
use a 20 Amp fuse, the A300 - a 30 Amp fuse, the A600 - a 50 Amp fuse and the A1200  
- 2 - 60 Amp fuses.  
In the case of a short circuit, AM III will engage to protect the shorted channel but will  
continue to play the unaffected channel. When this occurs, audible distortion will be  
heard. Turn off the system and repair this short. Once the problem has been  
repaired, the amplifier will return to normal operation.  
Differential Inputs  
One of the obstacles that must be overcome when designing a mobile audio system  
is that of external interference caused by alternators, generators, and other electrical  
subsystems. In other amplifiers, all input grounds are wired directly into the speaker  
ground, as shown in Figure B. The ArtSeries amplifiers, on the other hand, have iso-  
lation resistors between the input grounds and the speaker ground. This helps to pre-  
vent alternator noise from interfering with the signal between this unit and any prior  
"upstream" units.  
For safety reasons, PPI recommends that the power cable be fused at the positive  
terminal of the battery. If this fuse (not-supplied) is not installed, and the power wire  
shorts to ground (between the battery and the amplifier), a fire can result. The fuse at the  
battery should be of the same value as the fuse supplied with the amplifier. Consult your  
Authorized PPI Dealer for an appropriate in-line fuse that meets the needs of your  
installation.  
Installation  
Discrete Power Amp Circuitry  
PRIOR TO INSTALLATION of your new ArtSeries Amplifier it is important to consider  
the following: In your profession, your abilities and expertise insure a job well done.  
This is also true of professional car audio installers. It is their chosen profession, and  
why they do best. PPI believes so strongly in it's responsibility to you, that we invest  
heavily in hands-on training of professional installers. Our comprehensive system  
design and installation seminar provides our authorized dealers with the latest tech-  
niques to deal with the complexities of car audio today. There is more than meets the  
eye to insure that a car stereo reaches it's fullest potential. The trained professional,  
through experience, can approach, recognize, and address all the needs of the  
mobile audio environment. PPI highly recommends that this amplifier and/or any  
other mobile audio equipment be installed by a trained professional.  
Exclusive use of discrete output transistors  
results in increased sonic transparency,  
outstanding dynamic range, and high  
instantaneous current capability. We've  
designed the power bandwidth to be from  
10Hz to 50,000Hz +/- 1dB. This ability to  
produce full power with linear frequency  
response well beyond the threshold of  
human hearing insures that the amplifier's  
performance over the musical spectrum  
will be flawless.  
Tools / Parts Needed for Installation (not supplied):  
For safety reasons, PPI recommends that the power cable ve fused at the positive  
terminal of the battery. If this fuse is not installed, and the power wire shorts to  
ground (between the battery and the amplifier), a fire can result. The fuse at the bat-  
tery should be of the same value as the chassis fuse located on the right-hand end  
panel of the amplifier. Consult your Authorized PPI dealer for an appropriate in-line  
fuse holder that meets the needs of your installation. We suggest crimping and sol-  
dering all wire connections. Insulate the connection with heat shrink to prevent a  
short to ground  
Small flat blade screwdriver  
Wire cutters  
Soldering iron  
Phillips screwdriver  
Wire strippers  
Solder  
Flux cleaner  
5 washers, 4 #6 and 1 #8 sheet metal screws  
In-line fuse holder and fuse  
Power and Ground wire - 12 gauge or larger  
Grommets  
2 - ring connectors  
Speaker wire - 16 gauge or larger  
Heatshrink  
Silicone or similar material  
The ground wire should be of teh same gauge as the power wire. In systems with  
over 800 watts of total output power, the ground and power cables should run paral-  
lel to each other to avoid unwanted system noise. As a "rule of thumb", use as short a  
length of wire as possible. Locate an area near the amplifier that is metal (the floor is  
ideal) and clean an area about the size of a quarter to bare metal. Drill a pilot hole in  
the middle of this area. Be Careful!! Inspect the area underneath to be sure you aren't  
drilling into wires, brake or fuel lines, etc. Terminate the wire with a ring connector  
and attach it to the bare metal using a #8 sheet metal screw and washer (not sup-  
plied). We suggest crimping and soldering this connection. Insulate the connection  
with heat shrink. It is important that this connection be solid. After the conenction is  
complete, coat the area with silicone or some similar material to prevent rust from  
developing.  
Mounting  
To prevent damage to the amplifier while driving, mount it in a secure place. Choosing  
the appropriate location will depend upon your vehicle and the complexity of your system  
design. It may be mounted in any compatible space that is convenient to your needs and  
provides sufficient airflow. Adequate ventilation allows the amplifier to dissipate the heat  
that develops during operation. Inadequate ventilation may result in overheating. The  
thermal protection circuit will engage when the heatsink temperature reaches 75  
degrees Celsius. The amplifier will automatically return to normal operation once the  
heatsinkcools.  
Typical mounting locations include: trunk and passenger compartment (floor or under  
seat). Never mount the amplifier in a location, which would subject it to immersion or  
exposure to water.  
Once you have run both the power and ground wires, it's time to connect the cable to  
the amplifier. Be sure that you have not reconnected the ground cable to the nega-  
tive post of the battery. Cut off excess wire and, using wire strippers, strip the power  
and ground cables 1/4 inch. Locate the power and ground connector (supplied). On  
the under side of the connector are two slotted screws. With a small flat bladed  
screw driver, loosen these screws before attempting to insert the cables. After you  
have inserted the bared end of each cable into the connector, secure it by tightening  
the associated screw. If inserting larger gauge wire presents a problem, tinning the  
wire with solder may help. Be sure each connection is tight. Once the wires are  
secure, the connetor may be plugged into the amplifier. Please Note: the power /  
ground connector is keyed to a slot in the end panel and can only be inserted one  
way - with the head of the fastening screws pointing down. (Refer to Figure C.)  
The Art Series' uniquely shaped heatsink is designed for high-efficiency cooling but  
improper mounting may compromise its ability to cool. When mounting the amplifier in a  
confined space (i.e. under), care must be taken to ensure that at least two inches of  
clearance is provided around the amplifier. If the amplifier is located in an area which  
has restricted air-flow or is totally enclosed, a fan may be used to improve air circulation.  
Power and Ground  
Before beginning, disconnect the negative (-) terminal of the battery before working on the  
positive terminal to prevent a short to ground. Reconnect the negative terminal only after all  
connections have been made.  
The Art Series amplifiers are designed to operate from a car's (+) positive 12 volt,  
negative ground electrical system. PPI recommends that the power and ground cables  
be a minimum of 6 gauge for the A1200, 10 gauge for the A300 & A600 and 12 gauge  
for the A100 & A200. Depending upon the complexity of your system, larger gauge wire  
may be needed. PPI's Exclusive Wire Connection System will accept up to 6 gauge  
cable.  
The main power cable should run from the amplifier location, through the vehicle to  
the battery, avoiding sharp corners, creases, and sharp body parts. When passing  
through any metal wall (i.e. firewall, etc), a grommet must be used to prevent the  
wire from chaffing and shorting to ground.  
Bridging  
Remote Turn-On  
All ArtSeries amplifier are capable of being bridged into a mono output due to the  
internal design of the amplifier. This feature permits the creation of a mono channel  
for a subwoofer or center channel. Also bridging adds flexibility of operation. Any of  
the ArtSeries two-channel amplifiers may be used in a one channel (mono), two  
channels stereo, or 3 channels - 2 channels stereo and one channel derived mono  
configuration. ArtSeries four-channel amplifiers may be used as 2 mono channels, 3  
channels - 2 channels stereo and one bridged mono channel, 4 channels - 2 chan-  
nel (stereo) front and rear, 5 channels - 4 channels stereo and one derived mono  
channel, or 6 channels - 4 channels stereo and 2 derived mono channels.  
In order for the amplifier to turn on, a remote turn-on wire must be connected to a  
switched 12 volt source. Typically, the source unit provides a power antenna  
(remote) turn on lead which will turn on the amplifier when the source unit is activat-  
ed. If this is unavailable, or if voltage drops below 7 volts, a switched 12 volt source  
must be used (Refer to page 9, Central Muting and the ACM-420).  
Run a wire from the amplifer location through the vehicle to the switched 12 volt  
source. Observe the same precautions for routing this cable that you followed for  
running the power cable. Cut off excess wire and, using wire strippers, strip the wire  
1/4 inch.  
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. It is important that a minimum of 4 Ohm impedance is  
observed. If the impedance drops below 4 ohms while the amplifier is wired in the  
mono configuration, the AM II protection circuit will engage the output power will be  
reduced.  
Four channel ArtSeries amplifiers are shipped with two speaker connectors. One will  
accommodate five wires, and one will accommodate four wires. Locate the five wire  
connector which we will refer to as the speaker / remote turn-on connector. On the  
underside of the connector are five slotted screws. Loosed the middle screw before  
attempting to insert the remote turn-on lead into the end of the connetor. After the  
wire is inserted, secure it by the tightening the associated screw. If inserting larger gauge  
wire presents a problem, tinning the wire with solder may help. Be sure the connec-  
tion is tight. You are now ready to connect the speakers (Refer to Figure D).  
The ability to run stereo satellites wile simultaneously running a mono output from  
the same output stage is accomplished simply by running the stereo speakers nor-  
mally and tappng into the appropriate wires for teh "Mixed Mono" channel (left chan-  
nel positive wire as the positive speaker wire and the right channel negative wire as  
the negative speaker wire). Again, for optimum performance, speaker impedance  
should be 2 Ohms on the stereo channels and 4 Ohms on the mono channel.  
Speaker Connection  
Fun the speaker wires from the amplifier locations, through the vehicle to the speak-  
ers. Observe the same precautions for routing these wires that you followed for run-  
ning the power and remote turn-on cables. It is important to use 16 gauge or larger  
wire, for proper signal transfer. Cut off excess and, using wire strippers, strip 1/4  
inch. Once again, locate the speaer / remote turn-on connector. Loosen the four  
remaining screws on the underside of the connector. Insert the speaker leads, one at  
a time, into the end of the connector. Check to make sure you've maintained proper  
polarity before securing each wire. If inserting larger gauge wire presents a problem,  
tinning the wire with solder may help. Be sure the connection is tight. Repeat this  
process for the remaining four wire connector on four channel amps. The connectors  
may now be plugged into the amplifier (Refer to Figure D).  
Inputs  
On the left side panel of two-channel ArtSeries amplifier are one pair of RCA left  
and right inputs. Four-channel models feature two pair of RCA inputs and a "2/4 way"  
switch. If both "Input 1" and "Input 2" are to receive the same input signal, place the  
"2/4 way" switch in the on (in) position. This will parallel the inputs together internally  
in the amp. In this mode, either set of inputs may be used.  
Gain Control  
On the left end panel, next to the inputs, is the gain control. This control adjusts the  
level of the input signal of your source unti. This control requires a small flat-bladed  
screwdriver for adjustment. Upon installation of the amplifier, the gain control must  
be adjusted. This can be done by first turning the gain all the way down (counter-  
clockwise). Turn the volume on the source unit up to two-thirds. Then adjust the gain  
control until the desired volume is obtained without audible distortion.  
Low Impedance Indicator  
Adjusting Crossover Input Gains:  
AM II circuitry will lower output power to maintain uninterrupted operation whenever the  
amplifier senses an impedance load of less than 2 Ohms. The Low Impedance Indicator  
(left-side end panel) is provided to let you know when the amplifier is operating in this  
mode. It is important to note that there is no increase in output power below the 2 Ohm  
threshold. Maximum power is achieved at 2 Ohms.  
1. Adjust all crossover gain controls to 0 dB, 1/2 of maximum sensitivity.  
2. Adjust all amplifier gains to 1/2 of maximum sensitivity.  
3. Turn the volume knob on the equalizer to a maximum of 3 o'clock.  
4. Increase the gain of the crossover until the onset of audible distortion. Then  
decrease the gain prior to the immediate point of audible distortion. This setting  
will minimize system background noise and prevents overloading of the  
crossover.  
In the case of a short circuit, AM II will engage to protect the shorted channel but will  
continue to play the unaffected channel. When this occurs, audible distortion will be  
heard. Turn-off the system and repair the short. Once the problem has been repaired,  
the amplifier will return to normal operation.  
5. Repeat step 4 for any remaining crossovers in the system.  
6. Adjust the input gains next.  
NOTE: In manu multi-crossover / accessory systems, the gain of some  
crossover and accessories may need to be further decreased to achieve  
proper balance.  
System Tuning  
In order to achieve maximum signal-to-noise performance from a high quality mobile  
sound system, it is desirable to use high signal levels wherever possible in the  
interconnection cables. High signal levels will reduce the effect of induced noise. The  
peak level of an audio signal is usually determined by the clipping level of electronic  
components. The following procedure should be used as a guide when the system  
installation is complete.  
Adjusting the Amplifier's input Gain:  
1. Adjust the amplifier's input gain to 1/2 maximum sensitivity  
2. Turn the volume knob on the equalizer to a maximum of 3 o'clock  
3. Increase the gain (clockwise) until the onset of audible distortion. Then  
decrease the gain counterclockwise prior to the immediate point of audible  
distortion. This setting will minimize system background noise and prevents  
overloading of the amplifier.  
Adjusting Equalizer Input Gains:  
1. Turn the equalizer's volume control to minimum.  
2. Turn the source unit volume 1/2 to 3/4 of maximum. If available on your unit, set  
the output level to maximum. Some units may have a switch.  
3. If available, set selector switch to either input 1 or input 2.  
4. Adjust all equalizer input gains to minimum.  
5. For the chosen input play the respective music source. A loud music passage  
is desired.  
6. For the chosen input, increase the left input gain control until the onset of audible  
distortion. Then decrease the gain prior to the immediate point of audible  
distortion. This setting will minimize system background noise and prevents  
overloading of the equalizer. Adjust, for the same input, the right input gain  
control for proper left / right balance.  
4. Repeat step 3 for any remaining amplifiers in the system.  
NOTE: Depending on the sensitivity of the system's preamp(s), the gain of  
the amplifier(s) may not need adjustments. Also, in many multi-amplifier  
systems, the gain of some amplifiers may need to be further decreased to  
achieve proper balance.  
7. Set selector switch to the alternative source unit, if used, and repeat steps 5 and  
6.  
8. Adjust crossover next.  
TROUBLESHOOTING  
If for some reason your system fails to operate properly, please refer to this guide. If you are  
unable to resolve the problem, consult your Authorized PPI Dealer or call 1-800-62-POWER.  
NO SOUND  
Is the power LED illuminated?  
Check fuses in power wire.  
Be sure turn-on lead is connected.  
NO SOUND IN ONE CHANNEL  
Check speaker leads and inspect for a short to ground or  
an open connection.  
Check pre-amp leads. Reverse left and right leads to see  
if the problem is before the amplifier.  
Check Mono Bridge and Bi-Amp crossover switches on  
other units prior to the amp.  
If the problem is in the amp, have your Dealer inspect  
the unit.  
AMP TURNING OFF  
Is the amp able to cool properly?  
Check speakers for shorts or damage.  
Make sure power and ground are secure.  
Have PPI Dealer inspect amp.  

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