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ADEM

a)

CAR

AUDIO

AMPLIFIERS

OWNER’S

MANUAL

GFA-4302

GFA-4402

GFA-4304

GFA-4404

GFA-4702

IMPORTANT:

Be

sure

to

connect

the

POWER

and

GROUND

correctly!

Warranty

will

be

affected

if

the

amplifier

is

incorrectly

connected!

INSTALLATION

ADVISORY:

Clipped

strands

of

power

or

speaker

wire

could

enter

the

amplifier

through

the

Free-Flow

perforated

sleeve.

Be

sure

to

clip

wires

well

away

from

the

amplifier

to

avoid

this

possibility

Features

and

specifications

subject

to

change

without

notice.

ADCOM

Car

Audio

is

a

registered

trademark

of

ADCOM.

All

rights

reserved.

©1994

ADCOM

Inc.

>

AOWNER'S

ADCOM

MANUAL

Congratulations!

And

thank

you

for

choosing

ADCOM

Car

Audio

Amplifiers

for

your

mobile

sound

system.

Your

ADCOM

Car

Audio

Amplifier

uses

superior

engineering

principles

and

the

highest

quality

components

to

provide

a

musical

experience

with

clarity

and

dynamics

never

before

achieved

in

a

vehicle.

PLEASE

read

this

manual

entirely

before

attempting

to

install

this

product.

Due

to

the

sophisticated

nature

of

this

equipment,

we

highly

recommend

using

an

authorized

ADCOM

Car

Audio

Dealer

to

achieve

the

maximum

performance

from

your

mobile

sound

system!

Your

warranty

is

affected

if

you

choose

to

install

your

ADCOM

amplifier

yourself.

You

will

only

receive

all

the

benefits

of

the

limited

warranty

if

the

amplifier

is

professionally

installed

by

an

authorized

ADCOM

Car

Audio

Dealer!

Please

refer

to

your

warranty

card

for

further

details.

GFA-4302

GFA-4402

GFA-4304

GFA-4404

GFA-4702

Power

Output

30

W/Ch

@

20

W/Ch

@

40

WICh

@

70

WICh

@

2Ohms

Stereo

|

<0.25%

THD*

|

<0.25%

THD*

|

<0.25%

THD*

|

<0.25%

THD*

|

<0.2%

THD*

40hms

Mono

$

<0.25%

THD*

|

<0.25%

THD*

|

<0.25%

THD*

|

<0.25%

THD*

|

_<0.2%

THD*

Frequency

OHz-50KHz

|

OHz-50KHz

|

OHz-SOKHz

Response

+0dB,

-3dB

+0dB,

-3dB

+0dB,

-3dB

+0dB,

-3dB

+0dB,

-3dB

Power

OHz-50KHz

OHZ-5UKHZ

QHZ-SOKHZ

OHz-SOKHz

Bandwidth

+0dB,

-3dB

Í

+0dB,-3dB

|

+0dB,-3dB

|

+0dB,-3dB

|

+0d8,

-3dB

Input

Impedance

|

a5KOhms

|

a5kOhms

|

askOhms

|

85KOhms

|

8.5

K

Ohms

Input

Sensitivity

|

400mV

to

2v

|

400mV

to

2V

60OMV

to

2V

Separation

>90

dB

>90

dB

S/N

Ratio

2100

u5

>

100

dB

Damping

Factor

aso

|

sœ

|

o

æo

|]

eo

idle

Current

3

Amps

10

Amps

Fuse

Size

20

Amp

50

Amp

50

Amp

Weight

8

Ibs

(3.7kg)

|

10

Ibs

(4.6kg)

|

12

Ibs

(5.5kg)

|

19

lbs

(8.7kg)

|

32

Ibs

(14.6kg)

Dimensions

9.75x10.75x2.3"

|

9.75x12.76x2.2"

|

9.75x14.75x2.3"

|

9.75x24.25x2.3"

|

9.75x24.25x2.3"

in

inches

WxLxH

WxLxH WxLxH

WxLxH

9.75x15.5x2.3"

*

THD

Ratings

measured

between

20Hz

and

20khz

HOW

TO

USE

THIS

MANUAL

This

manual

is

divided

into

three

distinct

sections:

Section

1:

Common

features,

instructions

and

connections

for

all

ADCOM

Car

Audio

amplifiers.

Section

2:

Installation

instructions

for

the

GFA-4302

and

GFA-4402

(These

amplifiers

use

RCA

type

input

connections)

Section

3:

Installation

instructions

for

the

GFA-4304,

GFA-4404

and

GFA-4702

(These

amplifiers

use

5-pin

XLR

type

input

connections)

In

Sections

2

and

3

there

are

diagrams

to

help

install

ADCOM

Car

Audio

amplifiers

in

the

most

popular

configurations.

If

a

more

extensive

installation

is

required,

it

is

recommended

that

your

authorized

ADCOM

Car

Audio

dealer

perform

the

installation.

Technical

support

is

available

in

our

Customer

Service

department

by

calling

(908)

390-1130

9am

to

5pm

EST.

SECTION

1:

Common

Features

UNPACKING:

Below

is

a

list

of

what

is

included

with

each

model

amplifier:

GFA-4302

and

GFA-4402

GFA-4304

and

GFA-4404

1

Amplifier

1

Amplifier

1

Owner’s

Manual

1

Owner’s

Manual

1

Warranty

Card

1

Warranty

Card

1

In

Line

Fuse

Holder

1

In

Line

Fuse

Holder

2

RCA

Shorting

Plugs

2

GFY-4

XLR/RCA

Adapters

GFA-4702

(Amp

Section)

GFA-4702

(Power

Supply)

1

Amplifier

Section

1

Power

Supply

Section

1

Owner's

manual

1

Warranty

Card

1

GFY-4

XLR/RCA

Adapter

1

GFC-1

Power

Cable

If

anything

is

missing

from

your

carton,

please

contact

your

dealer

or

call

us

directly.

Be

sure

to

verify

that

the

serial

number

printed

on

the

bottom

of

the

amplifier

is

the

same

as

the

serial

number

on

the

carton.

If

either

number

is

missing

or

altered,

you

shouid

contact

ADCOM

immediately

at

(908)

390-1130.

Before

each

ADCOM

Car

Amplifier

leaves

our

facility

in

New

Jersey,

it

is

carefully

inspected

for

physical

imperfections

and

electrical

performance

as

a

routine

part

of

ADCOM'’s

Quality

Assurance

system.

This

is

to

ensure

flawless

performance

and

appearance

when

you

receive

it.

After

you

have

unpacked

your

amplifier,

inspect

it

for

physical

damage.

In

the

unlikely

event

that

damage

has

occurred

during

shipping,

a

freight

claim

to

cover

shipping

damage

can

be

initiated.

THE

RIGHT

A

TO

CLAIM

AGAINST

A

PUBLIC

CARRIER

CAN

BE

FORFEITED

IF

THE

CARRIER

IS

NOT

NOTIFIED

PROMPTLY

AND

IF

THE

SHIPPING

CARTON

AND

PACKING

MATERIAL

ARE

NOT

AVAILABLE

FOR

INSPECTION.

SAVE

ALL

PACKING

MATERIAL

UNTIL

THE

CLAIM

HAS

BEEN

SETTLED.

MOUNTING:

Ail

audio

components

in

a

vehicle

should

be

securely

mounted,

as

they

could

become

airborne

in

the

event

of

a

collision;

Serious

injury

could

occur.

ADCOM

Car

Audio

amplifiers

may

be

mounted

almost

anywhere;

every

model

is

fan-cooled,

so

mounting

possibilities

are

limited

only

by

your

imagination.

Follow

these

simple

guidelines

to

ensure

long

life,

cosmetic

integrity

and

sonic

dependability:

1.

Always

securely

mount

the

component

to

a

flat

surface

using

all

mounting

holes.

2.

Never

mount

an

audio

component

where

loose

objects

can

come

in

contact

with

it.

3.

Never

mount

an

amplifier

under

a

rug,

mat

or

carpet.

Remember,

the

better

the

ventilation,

the

less

chance

your

amp

will

thermally

shut

down!

When

mounting,

do

not

use

the

amplifier

as

a

drilling

template.

Use

as

a

marking

template,

only.

When

mounting

an

amplifier,

use

only

Pan-Head

screws,

not

beveled

head,

and

DO

NOT

OVER-TIGHTEN!

Pan

Head

Screw

<p

CONNECTING

POWER:

|

ADCOM

amplifiers

are

designed

to

be

used

with

12

Volt,

negative-

ground

vehicles.

The

first

step

is

to

disconnect

the

Ground(-)

battery

terminal!

The

positive

and

negative

gold-plated

power

connectors

on

the

amplifier

will

accommodate

up

to

GAWG

wire.

8AWG

cabie

is

the

standard

gauge

and

will

fit

with

the

insulation

into

the

power

connectors.

If

more

than

one

amp

is

being

installed,

use

4AWG

from

the

battery

to

a

power

distribution

block.

Run

BAWG

from

the

distribution

block

to

each

amplifier.

All

ground

connections

should

be

as

short

as

practically

possible

and

terminated

at

the

same

location.

A

fuse

or

protection

device

MUST

be

in

the

+12

Volt

power

cable

within

18”

of

the

battery.

It

should

also

be

readily

accessible.

An

additional

fuse

holder

may

be

located

within

18”

of

the

amplifier

or

power

distribution

block.

The

fuse

near

the

battery

is

to

protect

your

vehicle.

An

optional

fuse

near

the

amplifier

is

to

help

protect

the

amplifier!

When

a

fuse

blows,

replace

ONLY

with

an

identical

amperage

fuse!

Connect

the

IGN

terminal

on

the

amplifier

to

the

source

unit’s

power

antenna,

remote

or

amp-turn-on

lead.

When

the

source

is

turned

on,

it

supplies

12

volts

to

the

IGN,

which

turns

the

amplifier

on.

If

two

or

more

components

are

being

turned

on

by

the

remote

lead,

it

is

suggested

to

“relay”

the

turn

on.

(see

Fig.

1)

Here,

the

relay

(Bosch

0-322-204-150

or

P&B

VF4-45F11)

is

triggered

by

the

remote

lead

which

sends

current

to

the

IGN

connections.

This

is

considered

a

good

installation

technique

and

a

SPDT

relay

is

readily

available

from

most

installation

shops.

From

source

unit’s

“Power

Antenna”

or

“Remote”

lead

To

“IGN”

or

“Turn-On”

terminal

of

all

Amplifiers,

GFis

and

processors

To

constant

+12

Volts

(B+

or

power

distribution

block)

Fig.

1

Chassis

Ground

86=]

30

SPEAKER

CONNECTIONS:

ADCOM

uses

gold-plated

speaker

connectors

that

will

accommodate

up

to

8AWG

speaker

wire.

Standard

speaker

wire

gauge

is

12AWG

to

16AWG

and

will

fit

easily

into

the

terminals.

Be

sure

there

are

no

frayed

or

loose

wire

strands

that

may

end

up

touching

other

wires.

Speaker

polarity

is

clearly

marked;

special

attention

must

be

taken

while

connecting

speakers.

Speaker

polarity

is

essential

to

proper

amplifier

operation!

Any

number

of

speakers

may

be

used

with

your

ADCOM

Car

Audio

amplifier.

The

“system

impedance”

is

dependent

on

the

wiring

configuration

and

selection

of

speakers.

Although

ADCOM

amplifiers

are

stable

into

loads

of

less

than

%

Q,

continuous

operation

into

impedances

lower

than

2

Q

may

eventually

lead

to

thermal

overload,

causing

the

amplifier

to

shut

down

until

it

cools

off.

Your

authorized

ADCOM

Car

Audio

dealer

is

best

able

to

maximize

the

performance

of

your

system

by

calculating

impedance

and

ensuring

the

proper

connection

of

all

system

components.

MoSt™

CONFIGURATION:

ADCOM

Car

Audio

amplifiers

are

capable

of

running

stereo

and

mono

configurations

simultaneously.

In

order

to

achieve

this,

one

channel

must

be

inverted

at

the

input.

Inverting

simply

means

making

the

positive

lead

negative,

and

the

negative

lead

positive.

For

consistency,

we

recommend

that

the

“B”

or

“RIGHT”

channel

be

inverted.

In

addition,

the

same

channel’s

output

must

be

inverted

to

complete

the

process.

Inverting

techniques

will

be

discussed

in

sections

2

and

3.

INPUT

SENSITIVITY

SETTING:

Located

on

the

end

panel,

along

with

the

input

connectors,

are

two

small

openings

that

house

the

input

sensitivity

controls.

THEY

ARE

NOT

AMPLIFIER

VOLUME

CONTROLS!

When

properly

set,

they

match

the

output

of

the

source

unit

with

the

input

of

the

amplifier.

If

you

wish

to

have

the

amplifier

and

source

unit

properly

matched,

consult

your

authorized

ADCOM

Car

Audio

dealer.

Optimal

performance

and

the

advantages

of

“passively

terminated

balanced”

inputs

are

realized

when

sensitivity

controls

are

turned

fully

clockwise.

Since

the

sensitivity

controls

affect

only

the

positive

inputs,

the

controis

MUST

be

fully

clockwise

in

the

MaSt™

or

mono

configurations.

CARE

AND

CLEANING:

Great

care

has

been

taken

by

ADCOM

to

assure

that

your

amplifier

is

as

flawiess

in

appearance

as

it

is

electrically.

in

the

event

that

your

ADCOM

amplifier

needs

cleaning,

use

a

damp

cloth

or

dry,

soft

bristled

paint

brush.

Do

not

use

cleaning

fluids

of

any

kind

as

damage

to

the

finish

may

result.

Treat

this

product

as

a

precision

instrument,

and

it

will

provide

you

with

many

years

of

musical

enjoyment.

If

you

experience

any

problems

with

your

ADCOM

Car

Audio

amplifier,

please

contact

your

local

authorized

dealer

or

call

ADCOM

Customer

Service

at

(908)

390-1130

between

9am

and

5pm

EST.

Ask

for

Technical

Assistance

for

car

audio.

SECTION

2:

RCA

Input

Amps

INPUT

SECTION:

it

may

seem

unusual

to

find

4

RCA

inputs

on

a

2

channel

amplifier,

but

that

is

just

what

you

will

find

when

you

inspect

the

ADCOM

GFA-4302

or

GFA-

4402

amplifiers.

Channel

“A”

is

the

“LEFT”

and

channel!

“B”

is

the

“RIGHT”.

The

inputs

on

the

left

side

are

the

(+)positive

inputs

and

the

inputs

on

the

right

side

are

the

(-}

negative

inputs.

If

you

wish

fo

run

these

amplifiers

in

the

Balanced

mode,

it

is

strongly

suggested

that

an

authorized

ADCOM

Car

Audio

dealer

handle

this

installation!

There

are

two

ways

to

run

RCAs

into

these

amplifiers.

For

stereo

operation,

RCAs

connect

to

the

left-most

input

jacks,

labeled

A+

and

B+.

When

using

the

amplifier

in

either

a

bridged

Mono

or

MoSt™

configuration,

the

upper

left

and

lower

right

inputs,

labeled

A+

and

B-,

are

used.

Always

insert

the

included

RCA

Shorting

Plugs

into

unused

RCA

inputs!

WIRING

DIAGRAMS:

There

are

3

basic

wiring

schemes

for

the

GFA-4302

and

GFA-4402:

they

are

as

follows:

1.

Stereo

2.

Mono

3.

MoSt™

(Mono/Stereo

simultaneously)

In

the

Stereo

_

mode,

the

RCA

interconnect

cables

connect

to

the

Amplifier

as

follows:

The

left

cable

to

A+

input

and

the

right

cable

to

B+

input.

Speakers

hook

up

normally:

“A+”

and

“A-”

outputs

to

LEFT

speaker(s)

(+)pos

&

(-)neg,

and

“B+”

and

“B-”

outputs

to

the

RIGHT

speaker(s)

(+)pos

&

(-)neg.

See

Fig.2.

Remember

to

insert

the

RCA

Shorting

Plugs

in

the

unused

inputs.

BE

CERTAIN

OF

POWER/GROUND

CONNECTIONS

Fig.

2

In

the

Mono

mode,

the

LEFT

RCA

cable

connects

to

A+

input,

the

RIGHT

RCA

cable

connects

to

B-

input.

Remember

to

insert

the

RCA

Shorting

Plugs

in

the

unused

inputs.

The

speaker

outputs

connect

to

the

speaker

as

follows:

A+

output

connects

to

the

Positive(+)

speaker

terminal;

B+

output

connects

to

the

Negative(-)

speaker

terminal

(see

Fig.

3).

ADCOM

car

audio

amplifiers

are

stable

driving

a

1

Ohm

mono

load,

but

it

is

not

recommended.

For

best

results

(maximum

SPL

and

low

THD),

we

suggest

a

2

or

4

Ohm

mono

load.

BE

CERTAIN

OF

POWER/GROUND

CONNECTIONS

Fig.

3

in

the

MoSt™

configuration,

the

amplifier

is

capable

of

driving

multiple

pairs

of

stereo

speakers

(properly

crossed-over),

and

multiple

mono

subwoofers,

simultaneously!

To

wire

the

MoSt™

configuration,

connect

the

LEFT

RCA

to

the

A+

input;

connect

the

RIGHT

RCA

to

the

B-

input

Remember

to

insert

the

RCA

Shorting

Plugs

in

the

unused

inputs.

Wire

speakers

as

shown

in

Fig.

4.

LEFT

Shorting

esas)

Í

Since

you

are

|

~

i

inverting

the

|

i

|

input

on

“B”

or

|

i

RIGHT

channel

:

You

invert

the

“B”

or

RIGHT

i

channel

output,

i

as

well.

SUBWOOFER

BE

CERTAIN

OF

POWER/GROUND

CONNECTIONS

Fig.

4