Rockford Fosgate 75.2 Manuel utilisateur

® ®

car audio

fanatics

for

punc

h

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.

At Rockford Fosgate we are fanatics about musical reproduction at its best, and we are

pleased you chose our product. Through years of engineering expertise, hand craftsman-

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.

Great product and competent installations are only a piece of the puzzle when it comes

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 to hats and sunglasses.

To get a free brochure on Rockford Fosgate products and Rockford accessories, in the

U.S. call 602-967-3565 or FAX 602-967-8132. For all other countries, 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

verification of your factory warranty and may become useful in recovering your

amplifier if it is ever stolen.

Serial Number: ________________________________

Model Number:________________________________

T

ABLE

OF

C

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

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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. 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 finding new ways to improve our product, this information

is subject to change without notice.

GETTING STARTED

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NTRODUCTION

Rockford engineers designed the Punch 55.2, 75.2, 125.2

and

225.2

amplifiers to withstand the rugged automotive environment while delivering

superior sound quality in a flexible, reliable, and efficient package. TRANS•ANA

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

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

volume levels. This is matched with TOPAZ, a unique grounding circuit used

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

improve amplifier efficiency. The result of these components give the Punch

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 –

P

UNCH

A

MPLIFIER

A

CCESSORY

P

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)

T

ECHNICAL

D

ESIGN

F

EATURES

– 2 –

◆ TRANS•ANA

(TRANSconductance Active Nodal Amplifier)

The

TRANS•ANA

(TRANSconductance Active Nodal Amplifier) is a circuit

that allows the audio signal to pass through the amplifier at low 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.

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

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 “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: Elimination of troublesome ground loop noise between source

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

insulated metal substrate operating with minimal thermal resistance spreads

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

Fosgate is the only American amplifier manufacturer to have invested millions

into this process. DSM components differ from conventional discrete compo-

nents 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

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)

The Punch amplifiers utilize internal active crossovers. These crossovers have

many performance advantages such as using discrete components for exact

frequency adjustments which are far superior to potentiometers. 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

Component

Thru-Hole Surface Mount

PC

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

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 linearity. In addition,

MOSFETs operate very similarly to vacuum tubes in that they are more linear

than bi-polar transistors. However, MOSFETs can deliver the midrange clarity

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

this technique ever used, bringing previously unavailable levels of accuracy,

stability, temperature immunity and reliability to this critical process. 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.

– 4 –

◆ Punch EQ

The Punch EQ helps correct for acoustical deficiencies in the listening

environment. Two unique potentiometers that control bass and treble

compensate for the response errors present in most car environments. Unlike

conventional tone controls, Punch EQ corrects the specific problems of poor

low bass response and high frequency rolloff.

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

not needed.

D

ESIGN

F

EATURES

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 – 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

8

3

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

match the output of most source units. They can be adjusted to match

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

allows a narrow band adjustment of up to 18dB centered at 45Hz. 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. LED Power Indicator – The LED illuminates when the unit is turned on.

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

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.

– 6 –

HP

LP

HP

LP

FULL

For Bridged Mono Wiring

Connect 4Ω mono 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

10

I

NSTALLATION

C

ONSIDERATIONS

The following is a list of tools you will need for installing the Punch amplifier:

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 –

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

1. Be sure to carefully read and understand the instructions before attempt-

ing 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 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.

M

OUNTING

L

OCATION

The mounting location and position of your amplifier will have a great effect

on its ability to dissipate the heat generated during normal operation. The

design of our cast aluminum heatsink serves to easily dissipate the heat

generated over a wide range of operating conditions. 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.

Mounting the amplifier on the floor of the trunk will work but provides 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 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. Not only will this void your warranty but could create an

embarrassing situation caused by the ridicule from your friends.

– 8 –

B

ATTERY

AND

C

HARGING

– 9 –

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 and an energy storage

capacitor.

W

IRING

THE

S

YSTEM

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.

• For safety, disconnect the negative lead from the battery prior to beginning

the installation.

1. Configure the internal XCard crossovers prior to installation. Refer to

“Using the XCard” (page 14) for further information.

2. Plan the wire routing. Take care when running signal level RCA cables

to keep them close together but isolated 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.

3. Prepare the Power cable for attach-

ment to the amplifier by stripping 5/8"

of insulation from the end of the wire.

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.

><

5/8"

INSULATION

STRIP WIRE

>

AMP

>

– 10 –

Punch 55.2, 75.2, 125.2

Trim the power cable to within 18" of the battery and install the protective

rubber boot, which is packed with the fuseholder, over the end of the wire.

Strip 3/8" of insulation from the wire and insert into the end of the

fuseholder, then crimp it in place. Slide the rubber boot into place to cover

the connection. Use the section of cable that was trimmed earlier and

connect it to the other end of the fuseholder.

Punch 225.2

Mount the fuseholder within 18" of the battery using two (2) #8 screws.

Disassemble the fuseholder. You should have 2 black plastic end caps,

2 gold-plated fuse clips, a plastic spacer and the fuseholder body. Trim

the amplifier power cable to reach the fuseholder and strip the wire 3/8".

Slide one of the end caps over the wire (narrow end first) and insert the

wire into one of the fuse clips. Tighten the set screw. Screw the black end

cap to the fuseholder body to secure the cable. Use the section of cable

that was trimmed earlier and connect it to the other end of the fuseholder.

Install the plastic spacer in the fuseholder and attach the cable to the

fuseholder body.

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.

4. Strip 3/8" 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 a length of cable to be used for the ground connection. Strip

5/8" of insulation from the end of the cable as described previously

and connect to the appropriate terminal of the amplifier. 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

non-anodized screw and a star washer.

6. Prepare the REM turn-on wire for connection to the amplifier by stripping

1/4" 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 mechani-

cal switch in line with a 12 volt source to activate the amplifier.

7. Securely mount the amplifier (with supplied screws) to the vehicle or

amp rack. Be careful not to mount the amplifier on cardboard or plastic

panels. Doing so may enable the screws to pull out from the panel due

to 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. Connect the speakers. Strip the speaker wires 5/8". 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.

10. Perform a final check of the completed system wiring to ensure that all

connections are accurate. Check all power and ground connections for

frayed wires and loose connections which could cause problems.

11. 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 neighborhood. 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 successfully completed

another upgrade to your audio system for which they will probably spill

thumbtacks on your driveway.

– 11 –

U

SING

P

ASSIVE

C

ROSSOVERS

A passive crossover is 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 optimum driver performance.

A crossover network can perform one of three functions: High-Pass (capaci-

tors), Low-Pass (inductors or coils) and Bandpass (combination of capacitor

and coil).

The most commonly used passive crossover networks are 6dB/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 impedance 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 Punch ampli-

fiers are not recommended for impedance loads below 2Ω stereo and 4Ω

bridged (mono) loads.

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– 12 –

T

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ROSSOVER

C

OMPONENT

V

ALUES

6dB/Octave Low-Pass

6dB/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

L

C L

C

L C

L

C

L = Low-Pass (Inductor)

C = High-Pass (Capacitor)

For more information, see your Authorized Rockford Fosgate Dealer.

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– 13 –

– 14 –

3386

f

o

= R (in kΩ) for .047µf cap

= R (in kΩ) for .022µf cap

7234

f

o

Where: R = Ω

f

o

= desired crossover frequency

c = capacitor in farads

ex: .047 x 10

-6

for .047µf cap

Crossover Card

High Pass

Low Pass

Full Range

R1

R2

R1

R2

FULL

The crossover point can be altered by changing all 4 resistor values. Use the following

formula to select the appropriate resistor value to be placed on the XCard.

U

SING

THE

XC

ARD

1

2πf

o

c

The actual formula is:

R =

Low-Pass Full RangeHigh-Pass

FULL

↕

HP

➝

LP

HP

➝

LP

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 XCard shipped with

your amplifier is set for Full Range. 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.

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ESISTOR

C

HART

– 15 –

Frequency R1 R2

20Hz 169k

Ω 169kΩ

25Hz 133kΩ 133kΩ

30Hz 110kΩ 110kΩ

35Hz 95.3kΩ 95.3kΩ

40Hz 84.5kΩ 84.5kΩ

45Hz 75kΩ 75kΩ

50Hz 68.1kΩ 68.1kΩ

55Hz 61.9kΩ 61.9kΩ

60Hz 56.2kΩ 56.2kΩ

65Hz 52.3kΩ 52.3kΩ

70Hz 48.7kΩ 48.7kΩ

75Hz 45.3kΩ 45.3kΩ

80Hz 42.2kΩ 42.2kΩ

85Hz 40.2kΩ 40.2kΩ

90Hz 37.4kΩ 37.4kΩ

200Hz 16.9kΩ 16.9kΩ

300Hz 11.3kΩ 11.3kΩ

400Hz 8.45kΩ 8.45kΩ

500Hz 6.65kΩ 6.65kΩ

600Hz 5.62kΩ 5.62kΩ

700Hz 4.75kΩ 4.75kΩ

800Hz 4.22kΩ 4.22kΩ

900Hz 3.74kΩ 3.74kΩ

1kHz 3.40kΩ 3.40kΩ

1.2kHz 2.80kΩ 2.80kΩ

2kHz 1.69kΩ 1.69kΩ

3kHz 1.10kΩ 1.10kΩ

4kHz 845Ω 845Ω

5kHz 665Ω 665Ω

6kHz 562Ω 562Ω

7kHz 487Ω 487Ω

8kHz 422Ω 422Ω

Butterworth Alignment Q = .707

1% resistors used with 0.047µF caps

Butterworth Alignment Q = .707

1% resistors used with 0.022µF caps

Our tests have shown that using 0.047µf capacitors for frequencies below 100Hz, 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.

a

d

v

a

n

c

e

d

O

p

e

r

a

t

i

o

n

Frequency R1 R2

20Hz 357kΩ 357kΩ

25Hz 287kΩ 287kΩ

30Hz 237kΩ 237kΩ

35Hz 205kΩ 205kΩ

40Hz 178kΩ 178kΩ

45Hz 162kΩ 162kΩ

50Hz 143kΩ 143kΩ

55Hz 130kΩ 130kΩ

60Hz 121kΩ 121kΩ

65Hz 110kΩ 110kΩ

70Hz 102kΩ 102kΩ

75Hz 95.3kΩ 95.3kΩ

80Hz 90.9kΩ 90.9kΩ

85Hz 84.5kΩ 84.5kΩ

90Hz 80.6kΩ 80.6kΩ

200Hz 35.7k

Ω 35.7kΩ

300Hz 23.7kΩ 23.7kΩ

400Hz 17.8kΩ 17.8kΩ

500Hz 14.3kΩ 14.3kΩ

600Hz 12.1kΩ 12.1kΩ

700Hz 10.2kΩ 10.2kΩ

800Hz 9.9kΩ 9.9kΩ

900Hz 8.6kΩ 8.6kΩ

1.0kHz 7.15kΩ 7.15kΩ

1.2kHz 6.04kΩ 6.04kΩ

2.0kHz 3.57kΩ 3.57kΩ

3.0kHz 2.37kΩ 2.37kΩ

4.0kHz 1.76kΩ 1.76kΩ

5.0kHz 1.43kΩ 1.43kΩ

6.0kHz 1.21kΩ 1.21kΩ

7.0kHz 1.02kΩ 1.02kΩ

8.0kHz 909Ω 909Ω

– 16 –

I

NSTALLATION

*Keep grounds as short as possible

Power Connections

I

N

S

T

A

L

A

T

I

O

N

® ®

LED

Connect to remote

turn-on lead of

source unit

Connect to chassis

ground of vehicle*

Connect to B+ of battery with

appropriate fuse value

Less than 18"

GNDB+

P55

.

2

P75

.2

P125

.2

P225.

2

- 20A

- 30A

- 40A

- 50A

REM

– 17 –

I

N

S

T

A

L

A

T

I

O

N

® ®

Stereo Operation

Bass

Right

Gain

Right

Input

Left

Input

Left

Gain

Treble

–

+

+L–

Speaker

+R–

Speaker

–

+

RCA Input

2Ω min.

• RCA inputs are connected to

both left and right

channels

• Gain for left and right channels operate

independently

• Impedance for each channel should be

2Ω minimum

• XCard can be set for High-Pass, Low-Pass or Full Range

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Rockford Fosgate 75.2 Manuel utilisateur

Rockford Fosgate 75.2 Manuel utilisateur

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