Rockford Fosgate 125.2 User manual

® ®

car audio

fanatics

for

punc

2-Channel Amplifiers

Operation & Installation

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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 +001-602-967-8132.

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 1-800-669-9899. Be sure to have your serial

number, model number and date of purchase available when you call.

PRACTICE SAFE SOUND™

CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER 100dB

MAY CAUSE PERMANENT HEARING LOSS.HIGH POWERED AUTOSOUND

SYSTEMS MAY PRODUCE SOUND PRESSURE LEVELS WELL OVER

130dB. USE COMMON SENSE AND PRACTICE SAFE SOUND.

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:________________________________

ABLE

ONTENTS

Introduction................................................................................................1

Punch Amplifier Accessory Pack ................................................................... 1

Technical Design Features............................................................................2

Design Features .......................................................................................... 5

Installation Considerations ...........................................................................7

Mounting Location ...................................................................................... 8

Battery and Charging ..................................................................................9

Wiring the System....................................................................................... 9

Using Passive Crossovers........................................................................... 12

Table of Component Values........................................................................ 13

Using the XCard........................................................................................ 14

Resistor Chart ........................................................................................... 15

Installation ...............................................................................................16

System Diagrams...................................................................................... 20

Rockford Fosgate Accessories ..................................................................... 24

Troubleshooting........................................................................................ 26

Dynamic Power Measurements................................................................... 29

Specifications ........................................................................................... 31

Warranty Information ................................................................................ 33

International Information............................................................................34

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

® ®

TROUBLE-S

Welcometo Rockford Fosgate! This manual is designed to provideinformation

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. Other information can

be located by using the Table of Contents. We, at Rockford Fosgate, have

workedveryhardtomakesurealltheinformationinthismanualiscurrent.But,

asweareconstantlyfindingnewwaystoimproveourproduct,thisinformation

is subject to change without notice.

GETTING STARTED

NTRODUCTION

Rockford engineers designed the Punch 55.2, 75.2, 125.2and 225.2

amplifierstowithstandtheruggedautomotiveenvironmentwhiledelivering

superiorsoundqualityinaflexible,reliable,andefficientpackage.TRANS•ANA

is a low voltage circuit in the preamp stage of all Punch .2amplifiers that

lets the music sound crystal clear and very real, even when played at high

volumelevels.ThisismatchedwithTOPAZ,auniquegroundingcircuitused

to eliminate noise problems associated with car audio systems and their

installation. Flexibility is accomplished with the use of a built-in XCard.

Reliability is all but guaranteed with the use of a protection circuit called

NOMAD, while MOSFET and DSM (Discrete Surface Mount) technology

improveamplifierefficiency.Theresultof thesecomponentsgive thePunch

amplifier awesome sound quality in a “Bullet Proof” package. An explana-

tion of these technologies, most of which are exclusively designed and

patented by Rockford, are described in the Technical Design Features.

– 1 –

UNCH

MPLIFIER

CCESSORY

ACK

The accessory pack shipped with the Punch 2-channel amplifiers includes

the mounting hardware necessary to secure the amp to the vehicle and to

attach the end caps to the amplifier.

Installation & Operation Manual

Punch Verification Certificate

(4) Amplifier mounting screws (#8 x 3/4" Phillips)

(6) Speaker & power connector screws (3/32" Allen)

(4) End cap mounting screws (9/64" Allen)

(1) Allen Wrench 9/64"

(1) Allen Wrench 3/32"

(1) ATC Inline Fuseholder (Punch 55.2, 75.2, 125.2)

(1) AGU Inline Fuseholder (Punch 225.2)

(1) ATC 20 Amp Fuse (Punch 55.2)

(1) ATC 30 Amp Fuse (Punch 75.2)

(1) ATC 40 Amp Fuse (Punch 125.2)

(1) AGU 50 Amp Fuse (Punch 225.2)

ECHNICAL

ESIGN

EATURES

– 2 –

◆TRANS•ANA

(TRANSconductance Active Nodal Amplifier)

The

TRANS•ANA

(TRANSconductance Active Nodal Amplifier) is a circuit

thatallows the audio signal to passthroughtheamplifier at low voltage. The

signalisdirectly level-shiftedtothefixedhigh voltagerailsviaapair ofdriver

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.

THE RESULT: An extended frequency bandwidth accurately supplied to the

output stages of the amplifier.

◆TOPAZ (Tracking Operation Pre-Amplifier Zone)

The

TOPAZ

(Tracking Operation Pre-Amplifier Zone) circuitry solves ground

loopnoiseproblemscommontoautomotiveamplifierdesign.Thisinnovative

newdevelopmentallowsvastlyimprovedisolationoftheinputsignalgrounds

from the power supply ground of the amplifier. This is accomplished by

allowing the source unit to control the potential “environment” of the entire

input structure or “zone” of 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: Eliminationof troublesome ground loopnoisebetweensource

and amplifier.

◆MEHSA (Maximum Efficiency Heat Sink Application)

The

MEHSA

(Maximum Efficiency Heat-Sink Application) is a proprietary

process that yields up to 5 times better heat transfer than traditional FET

mounting techniques using the exact same components. A multi-layer

insulatedmetal substrate operatingwithminimal thermalresistancespreads

heat both downward & outward to quickly dissipate heat from each device

across the heat sink. This process combined with our DSM technology and

MOSFET devices allow us to squeeze more watts per cubic inch from every

output device as well as provide consistent thermal stability.

THE RESULT: Optimized power output, enhanced thermal stability, and

maximum component reliability.

◆DSM (Discrete Surface Mount) Technology

The

DSM

(Discrete Surface Mount) manufacturing process combines the

advantages of both discrete components and integrated circuitry. Rockford

FosgateistheonlyAmericanamplifiermanufacturertohaveinvestedmillions

intothisprocess.DSMcomponentsdifferfromconventionaldiscretecompo-

nents in different ways. They are more compact, more rugged, and they

efficientlydissipate generated heat.Usingthem whereverappropriateallows

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

maximum audio performance and highest signal-to-noise ratios to be

obtained in amplifiers of desirable package size without resorting to “ampli-

fier-on-a-chip” shortcuts. These advantages are shown below in Figure 1.

THE RESULT: Fewer connections, improved reliability, shorter signal paths,

superior signal-to-noise ratio and awesome sonic performance.

Figure 1

◆XCard (Internal Crossover)

ThePunchamplifiersutilizeinternalactivecrossovers.Thesecrossovershave

manyperformanceadvantagessuch asusing discretecomponents forexact

frequencyadjustmentswhicharefarsuperiortopotentiometers.Additionally,

the

XCard

can be configured for high-pass, low-pass and full range

operation. With slight modifications, 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 potentiometer designs.

– 3 –

Solder Solder

Component

Thru-Hole Surface Mount

Board PC

Board

◆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

(Metal Oxide Semiconductor Field Effect Transistor) devices offer

severalimportantinherentadvantagesoverthe30yearoldtechnologyofbi-

polar design. These advantages include: thermal stability, switching speed,

ultra low output impedance and wider bandwidth linearity. In addition,

MOSFETsoperateverysimilarly tovacuum tubesin thattheyaremorelinear

thanbi-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.

◆NOMAD (NOn-Multiplying Advanced Decision)

The Punch amplifiers use an

analog computer process

to maximize safe

output power under all operating conditions. The innovative

NOMAD

(NOn-

Multiplying Advanced Decision) system is the most sophisticated version of

thistechniqueeverused,bringingpreviouslyunavailablelevelsofaccuracy,

stability,temperatureimmunityandreliabilitytothiscriticalprocess.NOMAD

makesadvanceddecisionsbasedondevicevoltagesto preciselycontrolthe

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 –

◆Punch EQ

The Punch EQ helps correct for acoustical deficiencies in the listening

environment. Two unique potentiometers that control bass and treble

compensatefortheresponseerrorspresentinmostcarenvironments.Unlike

conventionaltonecontrols,PunchEQcorrectsthespecificproblemsofpoor

low bass response and high frequency rolloff.

THE RESULT: Full range sound without excessive boost in areas where it is

not needed.

ESIGN

EATURES

1. Cast Aluminum Heatsink – The cast aluminum heatsink of the Punch

amplifier dissipates heat generated by the amplifier's circuitry. The

inherentadvantageof casting provides a 30% improvement of cooling

over conventional extrusion heatsink designs.

2. End Caps – The unique end caps conceal the wiring and input cables,

giving the amplifier a clean “stealth” look.

+R–+L– Bass

Right

Gain

Right

Input

Left

Input

Left

Gain

Treble

Speaker Speaker

3 8 7 7

6 6 83

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 gold-plated spade terminal is used for the auto

power/remote turn on of the Punch amplifier.

6. RCA Input Jacks – The industry standard RCA jacks provide easy

connections for signal level input. They are gold-plated to resist the

signal degradation caused by corrosion.

49 5

GNDB+

LED

REM

– 5 –

7. Input Sensitivity Controls – The input level controls are preset to

matchtheoutputofmostsourceunits.They canbeadjustedtomatch

output levels from a variety of source units.

8. Punch Equalization Controls – The Punch EQ helps correct for

acoustical deficiencies in the listening environment. The Bass control

allowsanarrowbandadjustmentofupto18dBcenteredat45Hz.The

Treble control is a wide band hinged adjustment with a maximum of

12dB at 20kHz. The Punch EQ can be bypassed by turning the

controls to their minimum or counterclockwise position.

9. LEDPowerIndicator–TheLEDilluminateswhentheunitisturnedon.

10. XCard (Internal Crossover) – This built-in crossover card is

configurable for a multitude of operating frequencies. The orientation

ofthecardinitssocketdeterminesthefunctionofhigh-pass,low-pass,

or full range operation.

– 6 –

FULL

For Bridged Mono Wiring

Connect 4Ωmono woofer + to L+ of amplifier

and mono woofer – to R– of amplifier. Amplifier

will operate mono/stereo simultaneously.

ROCKFORD CORPORATION

MADE IN THE USA

27.5 Watts RMS continuous power per

channel into 4 Ohms with less than 0.08%

Total Harmonic Distortion from 20-20kHz

AMPLIFIER

Do Not Chassis

Ground Any Speaker.

+–

L+ R–

Low-Pass

Full Range

High-Pass

NSTALLATION

ONSIDERATIONS

Thefollowingis alistoftoolsyou willneedforinstallingthe Punchamplifier:

Allen wrenches 9/64" & 3/32" (included) Voltmeter

Wire strippers Battery post wrench

Electric hand drill w/assorted bits Wire cutters

17' (518.16cm) Red Power Wire Assorted connectors

12' (365.76cm) Remote Turn-On Wire Wire crimpers

1.5' (45.72cm) Black Grounding Wire

– 7 –

Thissectionfocusesonsomeofthevehicleconsiderationsforinstallingyour

new Punch amplifier. Checking your battery and present sound system, as

well as pre-planning your system layout and best wiring routes will save

installationtime. Whendecidinghowtolayoutyournewsystem,besurethat

each component will be easily accessible for making adjustments.

Before beginning any installation, be sure to follow these simple rules:

1. Besuretocarefullyreadandunderstandtheinstructionsbeforeattempt-

ing to install the amplifier.

2. For safety, disconnect the negative lead from the battery prior to

beginning the installation.

3. Foreasierassembly,wesuggestyourunallwirespriortomountingyour

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 appropriate 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. Grounding connec-

tions should be as short as possible and always be connected to metal

that is welded to the main body, or chassis, of the vehicle.

This manual suits for next models

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