Rockford Fosgate Stereo Amplifier PUNCH 4020 DSM User Guide

PUNCH 4020 DSM  
4-CHANNEL AMPLIFIER  
INSTALLATIO N & O PERATIO N  
®
®
 
TABLE O F CO N TEN TS  
Introduction ...................................................................................... 1  
Punch 4020 Amplifier Accessory Pack .............................................. 1  
Rockford Fosgate Accessories............................................................ 2  
Technical Design Features ................................................................ 3  
Punch 4020 Design Features ............................................................. 6  
Installation Considerations ................................................................ 8  
Mounting Location ............................................................................ 9  
Battery and Charging....................................................................... 10  
Wiring the System ........................................................................... 10  
Using the XCard .............................................................................. 12  
Sample Wiring Diagrams ................................................................ 14  
Troubleshooting .............................................................................. 18  
Dynamic Power Measurements ....................................................... 21  
Specifications .................................................................................. 23  
Warranty Information ...................................................................... 24  
G E T T I N G ST A R T E D  
Welcome to Rockford Fosgate! This manual is designed to provide  
information on the Punch 4020 amplifier for owner, salesperson  
and installer. To accomplish this, the manual is divided into five  
main sections: Introduction, Installation, Troubleshooting, Specifi-  
cations and Warranty Information. For those of you who want quick  
information on how to install this product, please turn to the Basic  
System Diagrams in the Installation section of this manual. Other  
information can be located by using the Table of Contents. We, at  
Rockford Fosgate, have worked very hard to make sure all the  
information in this manual is current. But, as we are constantly  
findingnew waysto improve ourproduct, thisinformation issubject  
to change without notice.  
 
I N T R O D U C T I O N  
The Punch 4020 is a 4-channel amplifier which offers 20 Watts  
per channel when driven into 4 Ohms. The amplifier utilizes a 2/  
4 input selector switch and XCard crossovers.  
When building a 4-channel amplifier, a major design challenge  
is to maintain sound quality in a limited space. For the Punch  
4020, Rockford Fosgate Engineers designed the Trans• Ana to-  
pology which is a fast, short loop circuit allowing the output stage  
to be driven with a low voltage drive signal. With the addition of  
a 2/4 input selector switch and XCard crossovers, the 4020 can  
be configured in many popular system designs without the added  
cost of external processors. The result is an excellent sounding  
amplifier in a physically compact area.  
The Punch 4020 satisfies the need for a powerful 4-channel  
amplifier at a competitive price.  
We strongly recommend you have your Authorized Rockford  
Fosgate Dealer install the new Punch 4020 amplifier. If you do  
choose to install it yourself, please be sure to read the entire  
manual before beginning.  
P U N C H 4 0 2 0 AM P LI FI ER  
AC C ESSO RY P AC K  
The accessory pack shipped with the Punch 4020 amplifiers  
include the mounting hardware necessary to secure it to the  
vehicle as well as attaching the end caps.  
Installation & Operation Manual  
Punch Verification Certificate  
(10)Hex Head screws for speaker and power connectors  
(4) Mounting screws for end caps  
(4) Mounting screws for amplifier  
(1) Allen wrench 7/64"  
(1) Allen wrench 13/32"  
– 1 –  
 
RO C KFO RD FO SG AT E AC C ESSO RI ES  
The following accessories were designed to enhance the perfor-  
mance of the Punch 4020 amplifier.  
Energy Storage Capacitor (PCH-C1)  
The Punch 1 farad capacitor is used to provide extra current  
needed by amplifiers to reproduce musical transients. The Punch  
Cap also has the natural ability to filter DC ripple caused by the  
alternator which can result in noise in the system. The PCH-C1  
will maximize both the sound quality and performance that  
Rockford Fosgate amplifiers can deliver.  
Punch Link (FG-LINK)  
The Punch Link is a specially cast heatsink interconnect which  
allows you to join any of our current Punch or Punch Power  
amplifiers together. While providing additional cooling through  
the coupling process, the Punch Link adds the finishing touch by  
giving you the look of one awesome amplifier.  
XCard  
Additional crossover card frequencies are available for special-  
ized requirements. You can get the following XCards from your  
Authorized Rockford Fosgate Dealer.  
XM50  
XM70  
XM100 = 100Hz  
XM150 = 150Hz  
XM200 = 200Hz  
=
=
50Hz  
70Hz  
XM275 = 275Hz  
XM400 = 400Hz  
XM4.5k = 4,500Hz  
XM6.5k = 6,500Hz  
XM00 = Blank card for  
custom crossover  
– 2 –  
 
TECH NICAL DESIGN FEATURES  
trans• ana  
The trans• ana (TRANS conductance Advanced Non-multiplying  
Amplifier) is a novel circuit that utilizes a short-loop complemen-  
tary topology and advanced Real Time Protection circuitry.  
THE RESULT: An amplifier design with the benefits of tube and bi-  
polar transistor amplifier design without the limitations of either.  
MOSFET Devices  
Rockford Fosgate is one of the few manufacturers in any of the  
sound communities to utilize MOSFET devices in both the power  
supply and the output stages. MOSFET (Metal Oxide Semicon-  
ductor Field Effect Transistor) devices offer several important  
inherent advantages over the 30 year old technology of bi-polar  
design. These advantages include: thermal stability, switching  
speed, ultra low output impedance and wider bandwidth linear-  
ity. In addition, MOSFET and vacuum tubes share many impor-  
tant operating characteristics. However, the MOSFET device is  
much faster, wider in bandwidth, measurably lower in distortion  
and far more linear than vacuum tubes.  
THE RESULT: Operational characteristics of vacuum tubes  
without the performance limitations of tube design.  
DSM (Discrete Surface Mount) Technology  
The DSM (Discrete Surface Mount) manufacturing process com-  
bines the advantages of both discrete components and integrated  
circuitry. Rockford Fosgate is the only American amplifier manu-  
facturer to have invested millions into this process. DSM compo-  
nents differ from conventional discrete components in three  
different ways. They are more compact and more rugged, and  
they take much better advantage of the PC board to allow them  
to get rid of any heat they generate. Using them wherever  
appropriate allows the advantages associated with discrete thru-  
hole circuitry to be retained while also providing room for both  
highly advanced processing features and generous PC board  
copper paths where needed. Their short lead-out structures allow  
maximum audio performance and highest signal-to-noise ratios  
– 3 –  
 
to be obtained in amplifiers of desirable package size without  
resorting to amplifier-on-a-chipshortcuts. These advantages  
are shown below in Figure 1.  
THE RESULT: Less connections, improved reliability, shorter  
signal paths, superior signal-to-noise ratio and awesome sonic  
performance.  
Component  
Figure 1  
Solder  
Solder  
Thru-Hole  
Surface Mount  
TOPAZ (Tracking Operation Pre-Amplifier Zone)  
The TOPAZ (Tracking Operation Pre-Amplifier Zone) circuitry  
solves ground loop noise problems common to automotive  
amplifier design. This innovative new development allows vastly  
improved isolation of the input signal grounds from the power  
supply ground of the amplifier. This is accomplished by allowing  
the source unit to control the potential environmentof the  
entire input structure or zoneof the amplifier. This process  
improves the noise rejection of the amplifier by 30-40dB an  
astounding 30-100 times better than amplifiers without TOPAZ.  
THE RESULT: Elimination of troublesome ground loop noise  
between source and amplifier.  
– 4 –  
 
XCard (Internal Crossover)  
The Punch 4020 amplifier utilizes internal active crossovers. These  
crossovers have many performance advantages such as using dis-  
crete components for exact frequency adjustments which are far  
superior to potentiometers. Additionally, the XCard can be config-  
ured for high-pass, low-pass and full range operation. With slight  
modification, many crossover frequencies and slope configurations  
can be achieved.  
THE RESULT: Increased system design flexibility with a precise  
electronic crossover without the limitations of conventional poten-  
tiometer designs.  
RTP (Real Time Protection)  
NOMAD (NOn-Multiplying Advanced Decision)  
The Punch 4020 amplifier uses an analog computer process to  
absolutely maximize safe output power under all operating condi-  
tions. Rockford Fosgate pioneered and developed RTP (Real Time  
Protection), a crucial element in the performance edge of our  
amplifiers. The innovative NOMAD (NOn-Multiplying Advanced  
Decision) system is the most sophisticated version of this technique  
ever used, bringing previously unavailable levels of accuracy,  
stability, temperature immunity and reliability to this critical pro-  
cess. NOMAD makes advanced decisions based on device voltages  
to precisely control the awesome levels of current available in the  
output MOSFETs to safe values but only when absolutely needed.  
THE RESULT: Extremely fast protection system that always protects  
the amplifier and never degrades the sound.  
– 5 –  
 
PUNCH 4020 D E SI G N FE AT U R E S  
1. Cast Aluminum Heatsink – The cast aluminum heatsink of the  
Punch amplifier dissipates heat generated by the amplifier's  
circuitry. The inherent advantage of casting provides a 30%  
improvement of cooling over conventional extrusion heatsink  
designs.  
2. End Caps – Interchangeable end caps conceal the wiring and  
input cables, giving the amplifier a clean “stealth” look.  
3
8
3
8
6
6
R
L
R
L
+
L
+
R
L
+
R
+
(Bridged Mono)  
Front Speakers  
(Bridged Mono)  
Rear  
Rear Speakers  
Front  
4
5
10  
POWER  
REM  
B+  
GND  
3. Speaker Terminals – The heavy duty, gold-plated terminal block  
connectors (+ and –) will accept wire sizes from 8 AWG to 18  
AWG. These gold-plated connectors are immune to corrosion  
that can cause signal deterioration.  
4. Power Terminals – The power and ground connectors on the  
Punch amplifier are gold-plated and will accommodate up to 8  
AWG wire maximizing the input current capability of the  
amplifier.  
5. REM Terminal – This spade terminal is used for the AP (auto  
power) or remote turn on of the Punch amplifier.  
– 6 –  
 
6. RCA Input Jacks – The industry standard RCA jack provides an  
easy connection for signal level input. They are gold-plated to  
resist the signal degradation caused by corrosion.  
7. Signal Input Switch – This switch allows selection of 2 channel  
or 4 channel source unit feed.  
8. Input Sensitivity Controls – The input level controls are preset  
for 500mV which will match the output of most source units.  
Theycan be adjusted to match inputlevelsrangingfrom 150mV  
to 3V.  
9. Internal Crossovers – These built-in crossover cards are  
configurable for a multitude of operating frequencies. The  
orientation of the card in its socket determines the function of  
high-pass, low-pass, or full range operation.  
10. LED Power Indicator – The LED illuminates when the unit is  
turned on.  
®
®
D S M  
A M P LIFIER  
20 Watts x 4 into 4at 0.05% THD  
30 Watts x 4 into 2at 0.1% THD  
®
RO CKFO RD CO RP O RATIO N  
M ADE IN THE USA  
High Pass  
Low Pass  
Full Range  
H P  
LP  
L P  
FULL  
HP  
9
7
XCard  
1
XCard  
2
Front  
Rear  
XCard  
XCard  
– 7 –  
 
IN STALLAT I O N C O N SI D ERAT I O N S  
The following is a list of tools you will need for installing the Punch  
amplifier:  
Allen wrenches 7/64" & 3/32" (included) Voltmeter  
Wire strippers  
Electric hand drill w/assorted bits  
Wire crimpers  
Battery post wrench  
Wire cutters  
Assorted connectors  
This section focuses on some of the vehicle considerations for  
installing your new Punch amplifier. Checking your battery and  
present sound system, as well as pre-planning your system layout and  
best wiring routes will save installation time. When deciding how to  
lay out your new system, be sure that each component will be easily  
accessible for making adjustments.  
Before beginninganyinstallation, be sure to follow these simple rules:  
1. Be sure to carefully read and understand the instructions before  
attempting to install the amplifier.  
2. For safety, disconnect the negative lead from the battery prior to  
beginning the installation.  
3. For easier assembly, we suggest you run all wires prior to  
mounting your amplifier in place.  
4. Route all of the RCA cables close together and away from any  
high current wires.  
5. Use high quality connectors for a reliable installation and to  
minimize signal or power loss.  
6. Think before you drill! Be careful not to cut or drill into gas tanks,  
fuel lines, brake or hydraulic lines, vacuum lines or electrical  
wiring when working on any vehicle.  
7. Never run wires underneath the vehicle. Running the wires  
inside the vehicle provides the best protection.  
8. Avoid running wires over or through sharp edges. Use rubber or  
plastic grommets to protect any wires routed through metal,  
especially the firewall.  
9. ALWAYS protect the battery and electrical system from damage  
with proper fusing. Install a fuseholder and fuse on the +12V  
power wire within 18” (45.7 cm) of the battery terminal.  
10. When grounding to the chassis of the vehicle, scrape all paint  
from the metal to ensure a good, clean ground connection.  
Groundingconnectionsshould be asshortaspossible and always  
be connected to metal that is welded to the main body, or chassis,  
of the vehicle.  
– 8 –  
 
MO UNTING LO CATIO N  
The mountinglocation and position ofyouramplifierwillhave a great  
effect on its ability to dissipate the heat generated under normal  
operation. The design of our cast aluminum heatsink serves to easily  
dissipate the heat generated over a wide range of operating condi-  
tions. However, to maximize the performance of your amplifier, care  
should be taken to ensure adequate ventilation.  
Trunk Mounting  
Mounting the amplifier vertically on a surface with the fin grooves  
running up and down will provide the best cooling of the amplifier.  
Mountingthe amplifieron the floorofthe trunkwillworkbutprovides  
less cooling capability than vertical mounting.  
Mounting the amplifier upside down to the rear deck of the trunk will  
not provide proper cooling and will severely affect the performance  
of the amplifier and is strongly not recommended.  
Passenger Compartment Mounting  
Mounting the amplifier in the passenger compartment will work as  
long as you provide a sufficient amount of air for the amplifier to cool  
itself. If you are going to mount the amplifier under the seat of the  
vehicle, you must have at least 1" (2.54cm) of air gap around the  
amplifier's heatsink.  
Mounting the amplifier with less than 1" (2.54cm) of air gap around  
the amplifier's heatsink in the passenger compartment will not  
provide propercoolingand willseverelyaffectthe performance ofthe  
amplifier and is strongly not recommended.  
Engine Compartment Mounting  
Rockford Fosgate amplifiers should never be mounted in the engine  
compartment. Not only will this void your warranty but could create  
an embarrassing situation caused by the ridicule from your friends.  
– 9 –  
 
BATTERY AN D CH ARG IN G  
Amplifiers will put an increased load on the vehicle's battery and  
charging system. We recommend checking your alternator and  
battery condition to ensure that the electrical system has enough  
capacity to handle the increased load of your stereo system. Stock  
electrical systems which are in good condition should be able to  
handle the extra load of any Rockford amplifier without problems,  
although battery and alternator life can be reduced slightly. To  
maximize the performance of your Rockford Fosgate amplifier, we  
suggest the use of a heavy duty battery, high output alternator and a  
stiffening capacitor like the Rockford Fosgate PCH-C1.  
W I R I N G T H E SYST E M  
CAUTION: Avoid running power wires near the low level input  
cables, antenna, power leads, sensitive equipment or harnesses. The  
power wires carry substantial current and could induce noise into the  
audio system.  
1. Plan the wire routing. Take care when running signal level RCA  
cablesto keep them close togetherbutisolated from the amplifier's  
power cables and any high power auto accessories, especially  
electric motors. This is done to prevent coupling the noise from  
radiated electrical fields into the audio signal. When feeding the  
wires through the firewall or any metal barrier, protect them with  
plastic or rubber grommets to prevent short circuits. Leave the  
wires long at this point to adjust for a precise fit at a later time.  
2. Prepare the Power cable for attachment to the amplifier by  
stripping 5/8" of insulation from the end of the wire. The use of 8  
gauge power cable can interfere with the installation of the end  
caps. Proper wire dress can prevent this from occurring. To  
prevent the wire from fraying, strip the insulation at a 45° angle.  
Insert the bared wire into the B+ terminal with the long side of the  
insulation on the top. Bend the cable down at a 90° angle. Tighten  
the set screw to secure the cable in place.  
NOTE: The B+ cable MUST be fused 18" or less from the vehicle's  
battery. Install the fuseholder under the hood and prepare the  
cable ends as stated above. Connections should be water tight.  
– 10 –  
 
3. Prepare a length ofcable to be used forthe ground connection.  
Strip 5/8" of insulation from the end of the cable as described  
above and connect to the appropriate terminal of the ampli-  
fier. Prepare the chassis ground by scraping any paint from the  
metal surface and thoroughly clean the area of all dirt and  
grease. Strip the other end of the wire and attach a ring  
connector. Fasten the cable to the chassis using a screw.  
4. Prepare the REM turn-on wire for connection to the amplifier  
by stripping 5/8" of insulation from the wire end and crimping  
an insulated spade connector in place. Slide the connector  
over the REM terminal on the amplifier. Connect the other end  
of the REM wire to a switched 12 volt positive source. The  
switched signal is usually taken from the source unit's auto  
antenna or the accessory lead. If the source unit does not have  
these outputs available, the recommended solution is to wire  
a mechanical switch in line with a 12 volt source to activate  
the amplifier.  
5. Connectthe source signalto the amplifierbypluggingthe RCA  
cables into the input jack(s) at the amplifier.  
6. Connect the speakers. Strip the speaker wires 5/8" and insert  
into the appropriate terminal on the amplifier. Insert the bared  
wire into the speaker terminal and tighten the set screw to  
secure into place. Be sure to maintain proper speaker polarity.  
DO NOT chassis ground any of the speaker leads as unstable  
operation may result.  
7. Perform a finalcheckofthe completed system wiringto ensure  
that all connections are accurate. Check all power and ground  
connections for frayed wires and loose connections which  
could cause problems from road vibrations.  
8. After the final inspection is complete, install the power fuse  
and enjoy listening. During the initial listening period, you  
may need to “fine tune” any phasing and level settings within  
your particular vehicle. To aid in this procedure, play a track  
with high musical content and cruise around your neighbor-  
hood. After fully evaluating the transient response of your  
system and making any final adjustments, all your neighbors  
within a 1 mile radius will assume that you have just success-  
fully completed another upgrade to your audio system for  
which they will probably spill thumbtacks on your driveway.  
– 11 –  
 
U SI N G T H E XCARD  
The crossover functions are controlled through the use of an  
XCard and can be set for high-pass, low-pass or full range  
operation. These cards are shipped in the most common fre-  
quency. Each crossover card has two faces: one face operates Full  
Range, the other has arrows to indicate the edge for selecting HP  
(high-pass) or LP (low-pass) operation. Orient the card with the  
desired operating edge, indicated by the arrow, toward the socket  
terminals inside the amplifier. Firmly, but carefully, plug the card  
into the socket.  
High Pass  
Low Pass  
Full Range  
H P  
LP  
L P  
FULL  
HP  
The crossover point can be altered by changing the resistor value.  
Use the following formula to select the appropriate resistor value  
to be placed on the XCard.  
3386  
= R (in k) for .047µf cap  
The actual formula is:  
f
o
1
R =  
7234  
2πf c  
= R (in k) for .022µf cap  
o
f
o
Crossover Card  
HigPass  
LoPass  
FulRange  
FULL  
Where: R = Ω  
f = desired crossover frequency  
o
c = capacitor in farads  
-6  
ex: .047 x 10 for .047mf cap  
– 12 –  
 
4 0 2 0 PO W ER CO N N EC TI O N S  
4
5
10  
POWER  
REM  
B+  
GND  
Connect to remote  
turn-on lead of  
source unit.  
Connect to chassis  
ground of vehicle*  
Less than 18"  
Connect to B+ of battery  
with a 30 amp fuse.  
*Keep grounds as short as possible.  
– 13 –  
 
SAM P L E W I R I N G D I AG R AM S  
4-CHANNEL STEREO  
Rear  
Front  
R
L
R
L
+
L
+
R
L
+
R
+
(Bridged Mono)  
Front Speakers  
(Bridged Mono)  
Rear Speakers  
Rear  
Front  
+
+
2Minimum  
High Frequency  
+
+
2Minimum  
Low Frequency  
Rear XCard*  
Front XCard*  
HP  
LP  
XCard  
1
XCard  
2
*Note: XCard can be inserted in HP,  
LP, or Full Range.  
• Signal input switch to 4 channel input.  
Gain for Front and Rear operate independently.  
Front is operating in stereo.  
Rear is operating in stereo.  
Experiment with subwoofer polarity to determine  
which sounds best in your system.  
– 14 –  
 
4-CHANNEL – STEREO FRONT  
MONO REAR  
Rear  
Front  
R
R
L
+
L
+
R
L
+
R
+
L
(Bridged Mono)  
Front Speakers  
(Bridged Mono)  
Rear Speakers  
Rear  
Front  
+
+
+
4Minimum  
2Minimum  
High Frequency  
Low Frequency  
Rear XCard*  
Front XCard*  
HP  
LP  
XCard  
1
XCard  
2
*Note: XCard can be inserted in HP,  
LP, or Full Range.  
• Signal input switch to 4 channel input.  
Gain for Front and Rear operate independently.  
Front is operating in stereo.  
Rear is operating in stereo.  
• Fader on source unit controls level of subwoofer.  
Experiment with subwoofer polarity to determine  
which sounds best in your system.  
– 15 –  
 
2-CHANNEL – MONO  
Rear  
Front  
R
L
R
L
+
L
+
R
L
+
R
+
(Bridged Mono)  
Front Speakers  
(Bridged Mono)  
Rear Speakers  
Rear  
Front  
+
+
4Minimum  
4Minimum  
Low Frequency  
Low Frequency  
Rear XCard*  
Front XCard*  
LP  
LP  
XCard  
1
XCard  
2
*Note: XCard can be inserted in HP,  
LP, or Full Range.  
• Signal input switch to 2 channel input.  
Gain for Front and Rear operate independently.  
Front is operating in mono.  
Rear is operating in mono.  
– 16 –  
 
4-CHANNEL – STEREO/MONO FRONT  
STEREO REAR  
Rear  
Front  
R
L
R
L
+
L
+
R
L
+
R
+
(Bridged Mono)  
Front Speakers  
(Bridged Mono)  
Rear Speakers  
Rear  
Front  
+
+
2Minimum  
2Minimum  
High Frequency  
High Frequency  
+
+
+
2Minimum  
High Frequency  
4Minimum  
Low Frequency  
Rear XCard*  
Front XCard*  
HP  
Full Range  
XCard  
1
XCard  
2
Note: XCard can be inserted in HP,  
LP, or Full Range.  
• Signal input switch to 4 channel input.  
Gain for Front and Rear operate independently.  
Front is operating in stereo/MONO.  
Rear is operating in stereo.  
• Fader on source unit controls level of rear.  
– 17 –  
 
TR O U BL E SH O O T I N G  
Symptom  
Diagnosis  
Remedy  
Amplifier doesnot  
turn on.  
Voltage applied to the Check the alternator, bat-  
REM terminal of the tery, fuse, and wiring and  
(Power LED is off) amplifierisnotbetween repair as necessary. If the  
10.5 and 15.5 volts or voltage is above 15.5 volts,  
there is no voltage have the electrical system  
present.  
inspected by an authorized  
car service center.  
Voltage to the B+ termi- Check the alternator, bat-  
nal of the amplifier is tery, fuse, and wiring and  
not between 10.5 and repair as necessary. If the  
15.5 volts or there is no voltage is above 15.5 volts,  
voltage present.  
have the electricalinspected  
by an authorized car service  
center.  
Amplifier is not prop-  
erly grounded.  
Check wiring and repair as  
necessary.  
Check connections, substi-  
tute with known working  
source and cablesand repair  
or replace as necessary.  
RCA Input from source  
unit is not connected or  
notfunctioningproperly.  
Amplifier has no  
sound.  
(Power LED is on)  
Checksignalinputswitchand  
XCard positions and repair  
or replace as necessary.  
XCards are missing or  
not placed properly in  
crossover slots and/or  
switches are not prop-  
erly selected.  
Disconnect existing speak-  
ers and test with known  
working speakers and wires.  
If amplifier plays, check and  
repair wiring and installa-  
tion of speakers as neces-  
sary.  
Speaker leads are  
shorted to each other or  
to the chassis of the ve-  
hicle.  
Replace speakers.  
Speakers are defective.  
– 18 –  
 
Symptom  
Diagnosis  
Remedy  
Readjust input gains of  
amplifier.  
Speaker Output  
Low or Distorted  
Input gain signal for  
amplifier set too low.  
Check system with known  
working source and repair  
orreplace orignalsource as  
needed.  
Source unit output too  
low.  
Check speaker polarity and  
correct as needed.  
Speakers wired out of  
polarity from the left to  
right channel.  
Check signal input switch  
and XCard positons and  
repair or replace as neces-  
sary.  
XCards are missing or  
not placed properly in  
crossover slots and/or  
switch not properly se-  
lected.  
Check the alternator, bat-  
tery, fuse and wiring and  
repair as necessary.  
Low battery voltage or  
large voltage drops to  
the amplifierunderload.  
Voltage spike from out-  
put of preceding com-  
ponent is entering am-  
plifierthrough inputsig-  
nal.  
Disconnectinputsignalto  
amplifier and turn ampli-  
fier on and off. If noise is  
eliminated, connect REM  
lead of amplifier to source  
unit with a delay turn-on  
module.  
Amplifier Noise  
(Turn-on Pop)  
Voltage spike from re-  
mote turn-on lead is  
entering through REM  
input terminal.  
Use different 12 volt  
source for REM lead of  
amplifier. (i.e., battery di-  
rect)Ifnoise iseliminated,  
use relay to isolate ampli-  
fier from noisy turn-on  
output.  
– 19 –  
 
Symptom  
Diagnosis  
Remedy  
Disconnect existing speak-  
ers and test with known  
working speakers. If engine  
noise is gone, check and  
repair wiring and installa-  
tion of speakers as neces-  
sary.  
Engine Noise on  
the Speaker Out-  
puts of the Ampli-  
fier  
Speaker leads are  
shorted to each other or  
to the chassis of the ve-  
hicle.  
Check connections, substi-  
tute with known working  
cablesand repairorreplace  
as necessary.  
RCA input from source  
unit is not connected or  
not functioning prop-  
erly.  
Run the RCA cable on a  
different route.  
RCA cable is picking up  
radiated noise.  
Disconnect antenna from  
the source unit. If engine  
noise is gone, check, and  
repair wiring and installa-  
tion or use an antenna  
ground loop isolator.  
Ground loop in antenna  
line.  
Bypass all other equipment  
(crossovers and equalizers)  
byconnectingthe head unit  
directly to the amp. If noise  
is gone, reconnect equip-  
ment one piece at a time  
and test for noise after each  
install.  
Multiple grounding  
pathsin the signal chain.  
• If noise persists, see your Authorized Rockford Fosgate Dealer.  
– 20 –  
 
D YN AM I C P O W E R M E ASU R E M E N T S  
About the Dynamic Power Measurements  
The Audio Graph PowerCube is a test instrument used to measure the  
output of an amplifier in accordance with IHF-202 industry stan-  
dards. The IHF-202 standard is a dynamic power measurement and  
was developed as a means of measuring power in a manner that best  
represents the Real World operation of an amplifier. Many manufac-  
turers, including Rockford Fosgate, at times will measure amplifier  
power into a fixed resistor (4 Ohm, 2 Ohm). While this method is  
useful in some types of evaluation and testing, it is not representative  
of an amplifier that is connected to a speaker and playing music.  
Music  
Music is dynamic; the sound waves are complex and constantly  
changing. In order to simulate this, the IHF-202 standard calls for the  
input signal to the amplifier to be a 1kHz bursted tone. This signal is  
input (on for 20 milliseconds) and reduced 20dB for 480 millisec-  
onds. The signal is gradually increased in level until the amplifier's  
output exceeds 1% Total Harmonic Distortion (THD). At 1% distor-  
tion becomes audible, therefore, any power produced above that  
level is considered not usable. Many manufacturers represent their  
amplifiers' output power in excess of 10% distortion. They use many  
names for this measurement, such as Total Maximum Power or  
Maximum Output Power. This is not indicative of the actual usable  
output power.  
Listening to Loudspeakers - Not Resistors  
A loudspeaker is not a resistor. A resistor's value (resistance measured  
in ohms) is fixed. A loudspeaker's impedance is dynamic. It is  
constantly changing in value, dependent upon the frequency of the  
input signal. Therefore, measuring power with the amplifier loaded  
into a 4 ohm resistor is not the same as measuring power with the  
amplifier connected to a 4 ohm speaker. Most people do not listen to  
music through a resistor.  
A4 Ohm speakermayexperience a drop in impedance 4-6 timeslower  
than its nominal (printed) impedance. A speaker will also create phase  
shifts in the signal that is passed through it. These phase shifts happen  
because a speaker is an inductor (voice coil) and a capacitor (compli-  
ance of the surround/spider), as well as a resistor (voice coil wire).  
To simulate a speaker the Audio Graph PowerCube measures output  
power into 20 different loads. It tests at 8 Ohms, 4 Ohms, 2 Ohms and  
1 Ohm. Each ofthese impedancesisalso tested at60°, 30°, 0°, +30°  
and +60° phase angles. These different impedances and phase angles  
representthe shiftsin impedance and phase thatcan occurin a typical  
loudspeaker.  
Appendix A  
– 21 –  
 
Information Cubed  
The data acquired in the testing procedure is then graphed in the form  
of a 3-dimensional cube. Hence the name PowerCube.  
The Phase Angle is expressed on the horizontal axis, the Output  
Voltage is presented on the vertical axis and the Impedance is  
displayed on the Z axis. Output Power, in watts, is listed on the left  
hand side for each impedance at each phase angle.  
AudioGraph – The PowerCube  
MODEL BEING  
TESTED  
VOLTAGE FROM  
BATTERY  
x2 = STEREO  
MONO = BRIDGED MONO  
Amplifier: PUNCH AMP 14.4V x 2  
Serial No:  
Rated Power : Rated Output - Watts per Channel  
Owner  
:
ROCKFORD CORPORATION  
860° 84  
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
*
30° 84  
0° 83  
POWER  
IN  
50V  
30V  
30° 84  
60° 85  
WATTS  
{
460° 159  
*
30° 154  
0° 153  
30° 154  
60° 158  
10V  
260° 266  
*
30° 251  
0° 245  
8Ω  
4Ω  
30° 248  
60° 261  
2Ω  
–60° (Cap)  
0°  
1Ω  
160° 378  
*
{
(Ind) +60°  
{
30° 343  
0° 333  
Impedance  
PHASE ANGLES  
30° 339  
60° 373  
What is an Amplifier?  
An amplifier by definition is a voltage generating device, recreating  
the signal which is input to it identically but with increased volume.  
It will be connected to a reactive load (the speaker). The impedance  
of this load and phase of the signal passing through the load will vary,  
dependent upon the frequency of the input signal (music).  
Therefore, a perfect amplifier will be able to maintain the same output  
voltage regardless of load characteristics and will not alter the signal  
it is reproducing. A perfect amplifier when measured by the  
AudioGraph PowerCube would present data that forms a perfect  
cube. Unfortunately, amplifiers are not perfect. The laws of physics  
generally prevent it. A great amplifier is about the best one can hope  
to attain.  
As you can see by the PowerCube and as you will experience by  
listening, your Punch amplifier is a GREAT AMPLIFIER!  
– 22 –  
 
SP EC I FI C AT I O N S  
Continuous Power Rating (Competition Standard) - Measured at 13.8V  
RMS continuous power per channel, all channels 20 Watts  
driven into a 4load from 20-20,000Hz with  
less than 0.05% Total Harmonic Distortion (THD)  
RMS continuous power per channel, all channels 30 Watts  
driven into a 2load from 20 to 20,000Hz, with  
less than 0.1% THD  
RMS continuous power bridged into a 4load  
60 Watts  
from 20 to 20,000Hz, with less than 0.10% THD  
Dynamic Power Rating (IHF-202 Standard) - Measured at 14.4V  
Mono into a 4Load  
Per channel into a 2Load  
Per channel into a 4Load  
82 Watts  
41 Watts  
26 Watts  
Signal-to-Noise Ratio  
>100dB  
A-weighted  
Factory Default Crossover Point  
Crossover Alignment  
Dimensions  
100Hz Butterworth  
12dB/octave  
9-5/8" W x 12-5/8" L x 2-5/8" H  
(24.4cm) x (32.0cm) x (6.6cm)  
Damping Factor @ 4(at output connetor)  
Bandwidth  
Frequency Response  
>150  
15Hz-100kHz ±3dB  
20Hz-20kHz  
±0.5dB  
Slew Rate  
30 Vµs  
IM Distortion (IHF)  
Input Sensitivity  
<0.05%  
Variable from  
150mV to 3V  
Preset at the  
factory for 500mV  
30 Amp  
Fuse size  
Input Impedance  
20k Ohms  
Specifications are subject to change without notice.  
– 23 –  
 
W ARRAN TY IN FO RMATIO N  
Rockford Fosgate warrants all electronics to the original consumer/purchaser to  
be free from defects in materials or workmanship for a period of three (3) years.  
We will cover parts and labor provided the product was purchased from an  
Authorized Rockford Fosgate Dealer. This warranty does not apply to any product  
on which the seals and/or serial number have been broken, removed, tampered  
with, defaced or altered in any manner. This warranty only applies to the original  
consumer/purchaser and is not transferable.  
Electronics found to be defective during the warranty period will be repaired or  
replaced at Rockford Fosgates discretion. Repaired or replaced electronics will  
be covered by the balance of the original warranty period only. Rockford Fosgate  
shall not be responsible for any incidental or consequential damages resulting  
from a defect in electronics. Some states do not allow the exclusion or limitation  
of incidental or consequential damages, so the previous limitation may not be  
applicable.  
The warranty does not cover any appearance item, any cost or expense related to  
the removal or reinstallation of the product, any accessory used in conjunction  
with the product, damage to the product resulting from alteration, accident,  
misuse or abuse, or improper installation. This warranty does not apply if the parts  
or labor, which would otherwise be provided without charge under this warranty,  
are obtained from any source other than Rockford Fosgate or an Authorized  
Rockford Fosgate Service Center.  
This warranty is the only express warranty and does not create any implied  
warranties. Rockford Fosgate limits its obligations under any implied warranties  
under state laws to a period not to exceed the written warranty period. Some states  
do not allow limitation on how long an implied warranty lasts, so the above  
limitation maynotapply. Thiswarrantyappliesonlyto productssold in the United  
States of America or its possessions. For warranty outside the U.S.A., please  
contact the nearest Authorized Rockford Fosgate Dealer. This warranty gives the  
consumerspecific legalrights, and the consumermayhave otherrightswhich vary  
from state to state.  
A defective product must be shipped prepaid to the Authorized Rockford Fosgate  
Dealer from which the consumer purchased the product or to the Rockford  
Fosgate factoryin Tempe, Arizona in the originalfactorycarton orequivalent. Any  
shipping loss or damage will be borne by the consumer or the consumers shipper.  
A consumer returning a product to the factory must call (800) 669-9899 for a  
Return Authorization Number. All shipments shall be clearly marked with the  
Return Authorization Number on the outside of the shipping carton.  
Ship to:  
Rockford Corporation  
Warranty Repair Department  
2055 E. 5th Street  
Tempe, AZ 85281 U.S.A.  
Return Authorization Number:_________________  
 
Rockford Fosgate  
Rockford Corporation  
546 South Rockford Drive  
Tempe, Arizona 85281 U.S.A.  
In U.S.A., (602) 967-3565  
In Canada, call Korbon (905) 567-1929  
In Europe, Fax (49) 4207-801250  
In Japan, Fax (81) 559-79-1265  
10/94  
MAN-0808-A  
 

Renesas Computer Hardware H8 3001 User Guide
Renesas Computer Hardware R0E571250CFG00 User Guide
Salton Coffee Grinder FAC500G User Guide
Salton Kitchen Grill GR10ABW User Guide
Samsung Projector SVP 6000N P User Guide
Sanyo Cell Phone SCP 7400 User Guide
Schneider Electric Marine Instruments EM3555 User Guide
Sears Air Conditioner 53DS900077 User Guide
Sears Vacuum Cleaner 113177035 User Guide
Sega Board Games 999 0886 01 User Guide