Rockford Fosgate 2.3 Owner's manual

.6
InstallationInstallation
InstallationInstallation
Installation
andand
andand
and
OperationOperation
OperationOperation
Operation
.3
.6
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car audio
fanatics
for
100 Watt Amplifier
2-channel
150 Watt Amplifier
2-channel w/crossover
300 Watt Amplifier
4-channel w/crossover

Dear Customer,
Congratulations on your purchase of the world's finest brand of car audio amplifiers.
AtRockfordFosgatewearefanaticsaboutmusicalreproductionatitsbest,andweare
pleasedyouchoseourproduct.Throughyearsofengineeringexpertise,handcraftsman-
ship and critical testing procedures, we have created a wide range of products that
reproduce music with all the clarity and richness you deserve.
For maximum performance we recommend you have your new Rockford Fosgate
product installed by an Authorized Rockford Fosgate Dealer, as we provide specialized
training through Rockford Technical Training Institute (RTTI). Please read your
warranty and retain your receipt and original carton for possible future use.
Greatproductandcompetent installationsareonly apieceofthepuzzle whenitcomes
to your system. Make sure that your installer is using 100% authentic installation
accessories from Connecting Punch in your installation. Connecting Punch has
everything from RCA cables and speaker wire to Power line and battery connectors.
Insist on it! After all, your new system deserves nothing but the best.
To add the finishing touch to your new Rockford Fosgate image order your Rockford
wearables,which include everything from T-shirts and jackets tohats and sunglasses.
To get a free brochure on Rockford Fosgate products and Rockford accessories, in the
U.S.call602-967-3565orFAX602-967-8132.Forallothercountries,call+001-602-
967-3565 or FAX [phone].
If, after reading your manual, you still have questions regarding this product,
we recommend that you see your Rockford Fosgate dealer. If you need further
assistance, you can call us direct at 1-800-795-2385. Be sure to have your serial
number, model number and date of purchase available when you call.
The serial number can be found on the outside of the box. Please record it in
the space provided below as your permanent record. This will serve as
verificationofyourfactorywarrantyandmaybecomeusefulinrecoveringyour
amplifier if it is ever stolen.
Serial Number: ________________________________
Model Number:________________________________
PRACTICE SAFE SOUND™
CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER
100dBMAY CAUSE PERMANENT HEARING LOSS. HIGH
POWERED AUTOSOUND SYSTEMS MAY PRODUCE SOUND
PRESSURE LEVELS WELL OVER 130dB. USE COMMON SENSE
AND PRACTICE SAFE SOUND.

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TABLE OF CONTENTS
Introduction ............................................................................................. 1
Accessory Pack ........................................................................................ 1
Technical Design Features ....................................................................... 1
2.3, 2.6x, 4.6x Design Features ................................................................ 5
Installation Considerations ....................................................................... 7
Mounting Location................................................................................... 8
Battery and Charging................................................................................ 9
Wiring the System .................................................................................... 9
Using Passive Crossovers .......................................................................11
Table of Crossover Component Values................................................... 12
Using the XCard..................................................................................... 13
Customizing the XCard ..........................................................................13
Resistor Chart.........................................................................................14
XCard Access ......................................................................................... 15
2.3 & 2.6x Installation............................................................................16
4.6x Installation .....................................................................................19
System Diagrams....................................................................................24
Troubleshooting .....................................................................................28
Dynamic Power Measurements.............................................................. 31
Specifications.........................................................................................33
Warranty Information.............................................................................35
International Information........................................................................ 36
Sections marked
ADVANCED OPERATION
include in-depth
technical information
Sections marked
TROUBLESHOOTING
include recommendations
for curing
installation problems
Sections marked
INSTALLATION
include “slam dunk”
wiring connections
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Welcome to Rockford Fosgate! This manual is designed to provide
information for the owner, salesperson and installer. For those of you
who want quick information on how to install this product, please turn
to the Installation Section of this manual or refer to the icons listed
below.OtherinformationcanbelocatedbyusingtheTableofContents.
We, at Rockford Fosgate, have worked very hard to make sure all the
information in this manual is current. But, as we are constantly finding
newways to improve ourproduct,thisinformation is subject tochange
without notice.
G ETTING S TARTED

– 1 –
INTRODUCTION
TECHNICAL DESIGN FEATURES
Thismanualprovidesinformationonthefeatures,installationandopera-
tionoftheRockfordFosgate2.3,2.6xand4.6xAmplifiers. Wesuggestyou
save this manual for future reference.
We strongly recommend you have your Authorized Rockford Fosgate
Dealer install your new Rockford Fosgate amplifier. If you do choose to
install your amplifier yourself, please be sure to read the entire manual
before beginning.
ACCESSORY PACK
Installation & Operation Manual
(1) Fuseholder
(1) ATC 10 Amp Fuse (2.3)
(1) ATC 20 Amp Fuse (2.6x)
(1) ATC 30 Amp Fuse (4.6x)
(1) 3/32" Allen Wrench
◆TRANS•ANA
(TRANSconductance Active Nodal Amplifier)
The TRANS•ANA (TRANSconductance Active Nodal Amplifier) is a
circuitthatallowstheaudiosignaltopassthroughtheamplifieratlow
voltage. The signal is directly level-shifted to the fixed high voltage
rails via a pair of driver transistors. Signal linearity is assured by an
active node formed by the drive transistors at ultrasonic frequencies.
This allows amplifier performance similar to trans• nova which is
highly stable and linear while utilizing the advantages of a non-
floating power supply.
THERESULT:Anextendedfrequencybandwidthaccuratelysupplied
to the output stages of the amplifier.

◆TOPAZ (Tracking Operation Pre-Amplifier Zone)
The TOPAZ (TrackingOperationPre-AmplifierZone)circuitry solves
groundloopnoiseproblemscommontoautomotiveamplifierdesign.
Thisinnovativenewdevelopmentallowsvastlyimprovedisolationof
the input signal grounds from the power supply ground of the
amplifier.Thisisaccomplishedbyallowingthe sourceunitto control
the potential “environment” of the entire input structure or “zone” of
the amplifier. This process improves the noise rejection of the ampli-
fier by 30-40dB – an astounding 30-100 times better than amplifiers
without TOPAZ.
THERESULT:Eliminationoftroublesomegroundloopnoisebetween
source and amplifier.
– 2 –
◆MOSFET Devices
Rockford Fosgate is one of the few manufacturers in the sound
community to utilize MOSFET devices in both the power supply and
the output stages . MOSFET (MetalOxideSemiconductor 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 imped-
ance and wider bandwidth linearity. In addition, MOSFETs operate
very similarly to vacuum tubes in that they are more linear than bi-
polartransistors.However,MOSFETscandeliverthemidrangeclarity
without the limitations of transient response and high frequency
phase shifting normally associated with tube operation.
THE RESULT: Operational characteristics similar to vacuum tubes
without the performance limitations of tube design.

– 3 –
◆DSM (Discrete Surface Mount) Technology
The DSM (Discrete Surface Mount) manufacturingprocesscombines
the advantages of both discrete components and integrated circuitry.
RockfordFosgateistheonlyAmericanamplifiermanufacturertohave
invested millions into this process. DSM components differ from
conventional discrete components in different ways. They are more
compact, more rugged, and they efficiently dissipate generated heat.
Using them wherever appropriate allows the advantages associated
with discrete 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
maximumaudioperformanceandhighestsignal-to-noiseratios tobe
obtained in amplifiers of desirable package size without resorting to
“amplifier-on-a-chip” shortcuts. These advantages are shown below
in Figure 1.
Figure 1
THE RESULT: Fewer connections, improved reliability, shorter signal
paths,superiorsignal-to-noiseratioandawesomesonicperformance.
Solder Solder
Component
Thru-Hole Surface Mount
PC
Board PC
Board
◆NOMAD (NOn-Multiplying Advanced Decision)
All Rockford Fosgate amplifiers use an analog computer process to
maximize safe output power under all operating conditions. The
innovative NOMAD (NOn-Multiplying Advanced Decision) system
isthemostsophisticatedversionofthistechniqueeverused,bringing
previously unavailable levels of accuracy, stability, temperature
immunity and reliability to this critical process. NOMAD makes
advanceddecisionsbasedondevicevoltagestopreciselycontrolthe
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.

– 4 –
◆High Level Inputs
Thehighlevelinputs on the Rockford Fosgate amplifiers convert the
speaker line outputs (high level) to preamp line inputs (low level).
This allows amplifier compatibility with a variety of source units as
well as the ability to integrate into factory systems without the need
for external adapters.
THE RESULT: Allows compatibility with factory and aftermarket
source units.
◆XCard Crossover (2.6x & 4.6x)
The2.6xand4.6xamplifiersutilizeinternalactivecrossovers.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.

– 5 –
2.3, 2.6X, 4.6XDESIGN FEATURES
CAUTION!
Any adjustment to
the Bias controls may damage
your amplifier and will void
your warranty.
CAUTION!
Do Not Adjust
8
.3
.6
&
Speaker Speaker B+
L+ L- R+ R-
High In
Gain
L&R L R L R
GND
LED
Input REM GND
Bias
Bias
5 3 4 7 2
1
6
+– +–
CAUTION!
Do Not Adjust
8
Bias
Bias
Speaker Speaker B+
LED REM GND
7
1
.6
CAUTION!
Do Not Adjust
8
Bias
Bias
L R
Input
5 3
L R
Input
5 3 4
6
LF+ LF- RF+ RF- Speaker
LR– LR+ Speaker RR– RR+
2
6
Gain
L&R
High In
LR
GND
+– +– Gain
L&R
High In
LR
GND
+– +–
4

– 6 –
1. Extruded Heatsink
The extruded aluminum heatsink of the RF amplifier dissipates
heat generated by the amplifier's circuitry.
2. Power/Speaker Barrier Strip
The barrier strip uses screw terminals that will accept #10 spade
lugs or bare speaker and power wire sizes from 10-18 AWG.
These gold-plated connectors are immune to corrosion that will
cause signal degradation.
3. 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.
4. High Level Inputs
The high level input connectors accept 1/8" spade lugs for the
connectionofasourceunitthathasonlyspeakerline(highlevel)
outputs.
5. Input Sensitivity Controls
The input level controls are preset for 500mV which will match
the output of most source units. They can be adjusted to match
output levels from a variety of source units.
6. Internal Crossover
The built-in crossover card is configurable for a multitude of
operating frequencies. The orientation of the card in its socket
determines its function of high-pass, low-pass or full range
operation.
7. LED Power Indicator
The LED gives a visual indication of the status of the amplifier,
lighting when the unit is turned on.
8. Bias Controls
The Bias controls are preset at the factory and are not user
adjustable. CAUTION! ANY ADJUSTMENT TO THE BIAS
CONTROLS WILL VOID YOUR WARRANTY!

– 7 –
INSTALLATION CONSIDERATIONS
Thefollowingisalistoftoolsyouwillneedforinstallingtheamplifier:
Wire Cutters #2 Phillips Screwdriver
Wire Strippers Assorted wire connectors
Wire Crimpers Battery Post Wrench
Voltmeter Electric Hand Drill with assorted bits
This section focuses on some of the vehicle considerations for
installing your new amplifier. Checking your battery and present
sound system, as well as pre-planning your system layout and best
wiringrouteswillsaveinstallationtime. Whendecidingonthelayout
of your new system, be sure that each component will be easily
accessible for making adjustments.
Beforebeginninganyinstallation,besuretofollowthesesimplerules:
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. RoutealloftheRCAcablesclosetogetherandawayfromanyhigh
current wires.
5. Use high quality connectors for a reliable installation and to
minimize signal or power loss.
6. Thinkbeforeyoudrill! Becarefulnottocutordrillintogastanks,
fuel lines, brake or hydraulic lines, vacuum lines or electrical
wiring when working on any vehicle.
7. Neverrunwiresunderneaththevehicle. Runningthewiresinside
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 appropriate fuse on
the+12Vpowerwirewithin18”(45.7cm)ofthebatteryterminal.
10. When grounding to the chassis of the vehicle, scrape all paint
from the metal to ensure a good, clean ground connection.
Groundingconnectionsshouldbeasshortaspossibleandalways
beconnectedtometalthatisweldedtothemainbody,orchassis,
of the vehicle.

– 8 –
MOUNTING LOCATION
The mounting location and position of your amplifier will have a
greateffectonitsabilitytodissipatetheheatgeneratedduringnormal
operation. The design of our aluminum heatsink serves to easily
dissipate the heat generated over a wide range of operating condi-
tions.However,tomaximizetheperformanceofyouramplifier,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.
Mounting the amplifier on the floor of the trunk will work but
provides less cooling capability than vertical mounting.
Mountingtheamplifierupsidedowntothereardeckofthetrunkwill
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
longasyouprovideasufficientamountofairfortheamplifiertocool
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 proper cooling and will severely affect the performance of
the amplifier and is strongly not recommended.
Engine Compartment Mounting
Rockford Fosgate amplifiers should never be mounted in the engine
compartment.Notonlywillthisvoidyourwarranty butcouldcreate
an embarrassing situation caused by the ridicule from your friends.

BATTERY AND CHARGING
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
suggesttheuseofaheavydutybattery,highoutputalternatorandan
energy storage capacitor.
WIRING THE SYSTEM
– 9 –
CAUTION: Avoid running power wires near the low level input
cables,antenna,powerleads,sensitiveequipmentorharnesses.The
power wires carry substantial current and could induce noise into
the audio system.
• For safety, disconnect the negative lead from the battery prior to
beginning the installation.
1. Remove the cover and configure the internal XCard crossovers
prior to installation. Refer to “Using the XCard” (page 13) for
further information.
2. Plan the wire routing. Take care when running signal level RCA
cablestokeepthemclosetogetherbutisolatedfromtheamplifier'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.
3. Prepare the Power cable for attachment to the amplifier by
stripping 1/2" of insulation from the end of the wire. Insert the
baredwireintotheB+terminalandtightenthesetscrewtosecure
the cable in place.
NOTE: TheB+cableMUSTbefused18"orlessfromthevehicle's
battery. Install the fuseholder under the hood and prepare the
cable ends as stated above. Connections should be water tight.

– 10 –
Trimthepowercablewithin18"ofthebatteryand
strip 1/2" of insulation from the end of the wire.
Cutthewireloopthatisattachedtothefuseholder
in half and splice the fuse into the power line
using appropriate inline connectors. Use the
section of cable that was trimmed earlier and
connect it to the other end of the fuseholder.
4. Strip 1/2" from the battery end of the power cable
and crimp a large ring terminal to the cable. Use the ring terminal
to connect to the battery positive terminal. Do not install the fuse
at this time.
5. Prepare the Ground cable for attachment to the amplifier by
stripping1/2"ofinsulationfromtheendofthewire.Insertthebared
wireintotheGNDterminalandtightenthesetscrewtosecurethe
cable in place. Prepare the chassis ground by scraping any paint
fromthemetalsurfaceandthoroughlycleantheareaofalldirtand
grease.Strip theother endofthe wireand attacharingconnector.
Fasten the cable to the chassis using a non-anodized screw and a
star washer.
6. Prepare theREM turn-on wire for connection to the amplifier by
stripping 1/2" of insulation from the wire end. Insert the bared
wireintotheREMterminalandtightenthesetscrewtosecurethe
cable into place. Connect the other end of the REM wire to a
switched12 volt positivesource.The switched voltage isusually
taken from the source unit's auto antenna or the accessory lead.
If the source unit does not have these outputs available, the
recommendedsolutionistowireamechanicalswitchinlinewith
a 12 volt source to activate the amplifier.
7. Securely mount the amplifier to the vehicle or amp rack. Be
carefulnottomounttheamplifieroncardboardorplasticpanels.
Doingsomayenablethescrewstopulloutfromthepaneldueto
road vibration or sudden vehicle stops.
8. Connect the source signal to the amplifier by plugging the RCA
cables into the input jacks at the amplifier.
9. Connectthe speakers. Strip the speaker wires1/2"andinsert 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.
10. Perform a final check of the completed system wiring to ensure
that all connections are accurate. Check all power and ground
connectionsforfrayedwiresandlooseconnections whichcould
cause problems.
Cut
here
X

– 11 –
USING PASSIVE CROSSOVERS
Apassivecrossoveris a circuit that uses capacitors and/or coils and is
placed on speaker leads between the amplifier and speaker. The
crossover delegates a specific range of frequencies to the speaker for
optimumdriverperformance.Acrossovernetworkcanperformoneof
three functions: High-Pass (capacitors), Low-Pass (inductors or coils)
and Bandpass (combination of capacitor and coil).
Themost commonlyusedpassive crossovernetworks are6dB/octave
systems. These are easy to construct and require one component per
filter. Placing this filter in series with the circuit will reduce power to
the speaker by 6dB/octave above or below the crossover point
depending on whether it is a high-pass or low-pass filter. More
complex systems such as 12dB/octave or 18dB/octave can cause
impedance problems if not professionally designed.
Passive crossovers are directly dependent upon the speaker's imped-
ance and component value for accuracy. When passive crossover
components are used in multiple speaker systems, the crossover's
effect on the overall impedance should be taken into consideration
along with the speaker's impedance when determining amplifier
loads. CAUTION: The Rockford Fosgate amplifiers are not recom-
mended for impedance loads below 2 Ω stereo and 4 Ω bridged
(mono) loads.
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TABLE OF CROSSOVER COMPONENT VALUES
6 dB/Octave Low-Pass 6 dB/Octave High-Pass
Freq.
Hertz Speaker Impedance
80 4.1mH 1000µF 8.2mH 500µF 16mH 250µF
100 3.1mH 800µF 6.2mH 400µF 12mH 200µF
130 2.4mH 600µF 4.7mH 300µF 10mH 150µF
200 1.6mH 400µF 3.3mH 200µF 6.8mH 100µF
260 1.2mH 300µF 2.4mH 150µF 4.7mH 75µF
400 .8mH 200µF 1.6mH 100µF 3.3mH 50µF
600 .5mH 136µF 1.0mH 68µF 2.0mH 33µF
800 .41mH 100µF .82mH 50µF 1.6mH 26µF
1000 .31mH 78µF .62mH 39µF 1.2mH 20µF
1200 .25mH 66µF .51mH 33µF 1.0mH 16µF
1800 .16mH 44µF .33mH 22µF .68mH 10µF
4000 .08mH 20µF .16mH 10µF .33mH 5µF
6000 51µH14µF .10mH 6.8µF .20mH 3.3µF
9000 34µH 9.5µF68µH 4.7µF .15mH 2.2µF
12000 25µH 6.6µF51µH 3.3µF 100µH 1.6µF
2 OHMS 8 OHMS
4 OHMS
LC L CL C
LC
L = Low-Pass (Inductor)
C = High-Pass (Capacitor)
For more information, see your Authorized Rockford Fosgate Dealer.
6 dB/Octave High-Pass and Low-Pass Filters
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3386
fo= R (in kΩ) for .047µf cap
= R (in kΩ) for .022µf cap
7234
fo
Where: R = Ω
fo= desired crossover frequency
c = capacitor in farads
ex: .047 x 10-6 for .047mf cap
Thecrossoverpointcanbealteredbychangingtheresistorvalue.Use
the following formula to select the appropriate resistor value to be
placed on the XCard.
USING THE XCARD
1
2πfoc
The actual formula is:
R =
The crossover functions are controlled through the use of an XCard
and can be set for high-pass, low-pass or full range operation. The
100Hz XCard shipped with your amplifier is set for Full Range. Each
crossover card has two faces: one face operates Full Range, the other
hasarrowstoindicatetheedgeforselectingHP(high-pass)orLP(low-
pass) operation. Orient the card with the desired operating edge,
indicated by the arrow, toward the socket terminals inside the ampli-
fier. Firmly, but carefully, plug the card into the socket.
– 13 –
CUSTOMIZING THE XCARD
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Low-Pass Full RangeHigh-Pass
FULL
↕
HP
➝
➝
LP
HP
➝
➝
LP
Crossover Card
High Pass
Low Pass
Full Range
R1 R2 R1 R2
FULL
C1
C2
C1
C2

– 14 –
RESISTOR CHART
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Frequency R1 R2
20Hz 169kΩ169kΩ
25Hz 133kΩ133kΩ
30Hz 110kΩ110kΩ
35Hz 95.3kΩ95.3kΩ
40Hz 84.5kΩ84.5kΩ
45Hz 75kΩ75kΩ
50Hz 68.1kΩ68.1kΩ
55Hz 61.9kΩ61.9kΩ
60Hz 56.2kΩ56.2kΩ
65Hz 52.3kΩ52.3kΩ
70Hz 48.7kΩ48.7kΩ
75Hz 45.3kΩ45.3kΩ
80Hz 42.2kΩ42.2kΩ
85Hz 40.2kΩ40.2kΩ
90Hz 37.4kΩ37.4kΩ
200Hz 16.9kΩ16.9kΩ
300Hz 11.3kΩ11.3kΩ
400Hz 8.45kΩ8.45kΩ
500Hz 6.65kΩ6.65kΩ
600Hz 5.62kΩ5.62kΩ
700Hz 4.75kΩ4.75kΩ
800Hz 4.22kΩ4.22kΩ
900Hz 3.74kΩ3.74kΩ
1kHz 3.40kΩ3.40kΩ
1.2kHz 2.80kΩ2.80kΩ
2kHz 1.69kΩ1.69kΩ
3kHz 1.10kΩ1.10kΩ
4kHz 845Ω845Ω
5kHz 665Ω665Ω
6kHz 562Ω562Ω
7kHz 487Ω487Ω
8kHz 422Ω422Ω
Butterworth Alignment Q = .707
1% resistors used with 0.047µF caps Butterworth Alignment Q = .707 1% resistors used with 0.022µF caps
Ourtestshaveshownthatusing0.047µfcapacitorsforfrequenciesbelow100Hz,and
0.022µf capacitors for frequencies above 100Hz, result in more linear crossover
control. Refer to the Specifications page to determine the capacitor value of each
supplied XCard.
Frequency R1 R2
20Hz 357kΩ357kΩ
25Hz 287kΩ287kΩ
30Hz 237kΩ237kΩ
35Hz 205kΩ205kΩ
40Hz 178kΩ178kΩ
45Hz 162kΩ162kΩ
50Hz 143kΩ143kΩ
55Hz 130kΩ130kΩ
60Hz 121kΩ121kΩ
65Hz 110kΩ110kΩ
70Hz 102kΩ102kΩ
75Hz 95.3kΩ95.3kΩ
80Hz 90.9kΩ90.9kΩ
85Hz 84.5kΩ84.5kΩ
90Hz 80.6kΩ80.6kΩ
200Hz 35.7kΩ35.7kΩ
300Hz 23.7kΩ23.7kΩ
400Hz 17.8kΩ17.8kΩ
500Hz 14.3kΩ14.3kΩ
600Hz 12.1kΩ12.1kΩ
700Hz 10.2kΩ10.2kΩ
800Hz 9.9kΩ9.9kΩ
900Hz 8.6kΩ8.6kΩ
1.0kHz 7.15kΩ7.15kΩ
1.2kHz 6.04kΩ6.04kΩ
2.0kHz 3.57kΩ3.57kΩ
3.0kHz 2.37kΩ2.37kΩ
4.0kHz 1.76kΩ1.76kΩ
5.0kHz 1.43kΩ1.43kΩ
6.0kHz 1.21kΩ1.21kΩ
7.0kHz 1.02kΩ1.02kΩ
8.0kHz 909Ω909Ω

– 15 –
XCARD ACCESS
The internal XCard crossover(s) are accessible by removing the top
cover from the amplifier. The XCard should be inserted with the filter
side (HP, LP or FULL RANGE) facing the metal contacts inside the
socket (toward RCA jacks).
•Remove Four Allen Screws from cover with supplied Allen wrench (3/32")
• Insert XCard into socket with HP, LP, or FULL RANGE facing RCA jacks
CAUTION!
Do Not Adjust
Bias
Bias
Speaker Speaker B+
LED REM GND
.6
CAUTION!
Do Not Adjust
Bias
Bias
Gain
L&R L R
Input Gain
R
Gain
LL R
Input
LF+ LF- RF+ RF- Speaker
LR– LR+ Speaker RR– RR+
Low-Pass Full RangeHigh-Pass
FULL
↕
HP
➝
➝
LP
HP
➝
➝
LP
High In
LR
GND
+– +–
High In
LR
GND
+– +–

2.3 & 2.6XINSTALLATION
– 16 –
I
N
S
T
A
L
L
A
T
I
O
N
® ®
High Level Input – “Single Ended” Type
This configuration is used for source units that have “Single Ended” speaker outputs.
Only the “+” output is “hot,” whereas the “–” or “common” are common grounded. To
verify your source unit has these outputs, connect an ohm meter across the “–” output
and radio chassis for a reading of 0Ω.
• L+ and R+ Inputs are connected to corresponding “+” speaker outputs
• L– and R– Inputs are not used
• GND Input is connected to “–” speaker outputs
CAUTION: Use 1/8" female connectors when using the high level inputs and DO NOT
solder wires directly to the connector
High Level Input – “B.T.L.” Type
This configuration is used for source units that have “B.T.L.” speaker outputs (Bridged
Transformer Less not Bacon Tomato & Lettuce). Both “+” and “–” outputs are considered
“hot” or “floating.”
• L+ and R+ Inputs are connected to corresponding “+” speaker outputs
• L– and R– Inputs are connected to corresponding “–” speaker outputs
• GND Input is not used unless noise problems arise
B+Gain
L+R L R
LED
Input REM
Front
® ®
Speaker
L+ L- R+ R-
Speaker
GND
L–
R+
R–
L+
+– +–
GND
High In
L R
AUD SEL
1 2 3 4 5 6
RDM
RPT
SCAN PAUSE
D.SCN DIM
AMFM Ch
RPTLD RDM
DISC ST
P.SCN LOUDDSPL
R
CLOCK ILLUM
PWR
AUTO
® ®
VOL TUNE
Front
R+
GND
B+Gain
L+R L R
LED
Input REM
L+
® ®
Speaker
L+ L- R+ R-
Speaker
GND
GND
+– +–
High In
LR
100.7
+
–^
v
Factory Radio

– 17 –
Power Connections
Stereo Operation
• RCA Inputs are connected to both left and right inputs
• Impedance Load for each channel should be 2 Ω minimum
• XCard can be set for High-Pass, Low-Pass or Full Range
I
N
S
T
A
L
L
A
T
I
O
N
® ®
® ®
Speaker Speaker
B+
LF+ LF- RF+ RF-
L R
LED
Input REM GND
Speaker
LR- LR+
Speaker
RR- RR+
Front Rear
L R
Input
Gain
L+R
R
GND
+–
L
High In
+– Gain
L+R
R
GND
+–
L
High In
+–
Connect to B+ of battery
with 30A fuse
Less than 18"
Connect to remote
turn-on lead of
source unit Connect to chassis
ground of vehicle
® ®
Speaker Speaker
B+
L+ L- R+ R-
L R
LED
Input REM GND
2ΩMin.
.3
+– +–
2ΩMin.
Gain
L+R
High In
RL
+– +–
GND