Kenwood KAC-848 User manual

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3

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1

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KAC-848

KAC-748

4-CHANNEL

POWER

AMPLIFIER

►

Page

2-11

INSTRUCTION

MANUAL

AMPLIFICATEUR

DE

PUISSANCE

4

CANAUX

►

Page

12-21

MODE

D’EMPLOI

AMPLIFICADOR

DE

POTENCIA

DE

4

CANALES

►

Page

22-31

MANUAL

DE

INSTRUCCIONES

KENWOOD

CORPORATION

Take

the

time

to

read

through

this

instruction

manual.

Familiarity

with

installation

and

operation

procedures

will

help

you

obtain

the

best

performance

from

your

new

power

amplifier.

For

your

records

Record

the

serial

number,

found

on

the

back

of

the

unit,

in

the

spaces

designated

on

the

warranty

card,

and

in

the

space

provided

below.

Refer

to

the

model

and

serial

numbers

whenever

you

calUipon

your

KENWOOD

dealer

for

information

or

service

on

the

product.

Model

KAC-848/748

Serial

number_

-

©

PRINTED

IN

USA

B64-1350-00

(KM)

Safety

precautions

|

AWARDING

To

prevent

injury

or

fire,

take

the

following

precautions:

•

When

extending

the

ignition,

battery,

or

ground

wires,

make

sure

to

use

automotive-

grade

wires

or

other

wires

with

a

5mm

2

(AWG10)

or

more

to

prevent

wire

deterioration

and

damage

to

the

wire

coating.

•

To

prevent

a

short

circuit

never

put

or

leave

any

metallic

objects

(such

as

coins

or

metal

tools)

Inside

the

unit.

•

If

the

unit

starts

to

emit

smoke

or

strange

smells,

turn

off

the

power

immediately

and

consult

your

Kenwood

dealer.

•

Do

not

touch

the

unit

during

use

because

the

surface

of

the

unit

becomes

hot

and

may

cause

burns

if

touched.

acauti6n~

To

prevent

damage

to

the

machine,

take

the

following

precautions:

•

Be

sure

the

unit

is

connected

to

a

12V

DC

power

supply

with

a

negative

ground

connection.

•

Do

not

open

the

top

or

bottom

covers

of

the

unit.

•

Do

not

install

the

unit

in

a

spot

exposed

to

direct

sunlight

or

excessive

heat

or

humidity.

Also

avoid

places

with

too

much

dust

or

the

possibility

of

water

splashing.

•

When

replacing

a

fuse,

only

use

a

new

one

with

the

prescribed

rating.

Using

a

fuse

with

the

wrong

rating

may

cause

your

unit

to

malfunction.

•

To

prevent

a

short

circuit

when

replacing

a

fuse,

first

disconnect

the

wiring

harness.

1

NOTE

•

If

you

experience

problems

during

installation,

consult

your

Kenwood

dealer.

•

If

the

unit

does

not

seem

to

be

working

right,

consult

your

Kenwood

dealer.

Cleaning

the

unit

If

the

front

panel

gets

dirty,

turn

off

the

power

and

wipe

the

panel

with

a

dry

silicon

cloth

or

soft

cloth.

ACAUnONH

Do

not

wipe

the

panel

with

a

hard

cloth

or

a

cloth

dampened

by

volatile

solvents

such

as

paint

thinner

and

alcohol.

They

can

scratch

the

surface

of

the

panel

and/or

cause

the

indicator

letters

to

peel

off.

FCC

WARNING

This

equipment

may

generate

or

use

radio

frequency

energy.

Changes

or

modifications

to

this

equipment

may

cause

harmful

interference

unless

the

modifications

are

expressly

approved

in

the

instruction

manual.

The

user

could

lose

the

authority

to

operate

this

equipment

if

an

unauthorized

change

or

modification

is

made.

Accessories

Part

name

External

View

Number

of

Items

Terminal

cover

(Power

terminal)

<$§£>

1

Self-tapping

screws

(o4

x

16

mm)

@Em>

4

Protection

function

This

unit

is

equipped

with

a

protection

function

for

protecting

this

unit

and

your

speakers

from

various

accidents

or

problems

that

can

occur.

When

the

protection

function

is

triggered,

the

Power

indicator

goes

off

and

the

amplifier

stops

operating.

■

Power

indicator:

When

the

power

is

turned

on,

the

Power

indicator

lights.

If

the

Power

indicator

does

not

light

when

the

power

is

turned

on,

the

protection

function

may

be

activated.

Check

whether

there

is

any

indication

of

trouble.

■

The

protection

function

activates

in

the

following

situations:

•

When

a

speaker

wire

may

be

short-circuited.

•

When

a

speaker

output

contacts

ground.

•

When

the

temperature

of

internal

parts

exceeds

120°C

(248°F).

•

When

a

ground

wire

of

the

center

unit

(cassette

receiver,

CD

receiver,

etc.)

or

this

unit

is

not

connected

to

a

metal

part

serving

as

an

electrical

ground

passing

electricity

to

the

battery's

negative

©

terminal.

2

English

Power

indicator

Installation

procedure

1.

Remove

the

ignition

key

and

disconnect

the

negative

©

terminal

of

the

battery

to

prevent

short

circuits.

2.

Set

the

unit

according

to

the

intended

usage.

3.

Connect

the

input

and

output

cables

of

the

units.

4.

Connect

the

speaker

wires.

5.

Connect

the

power

wire,

power

control

wire

and

grounding

wire

following

this

order.

6.

Install

the

unit

in

the

car.

7.

Connect

the

negative

©

terminal

of

the

battery.

ACAUTION

•

Be

sure

to

turn

the

power

off

before

changing

the

setting

of

any

switch.

•

If

the

fuse

blows,

check

wires

for

shorts,

then

replace

the

fuse

with

one

of

the

same

rating.

•

Check

that

no

unconnected

wires

or

connectors

are

touching

the

car

body.

Do

not

remove

caps

from

unconnected

wires

or

connectors

to

prevent

short

circuits.

•

Connect

the

speaker

wires

to

appropriate

speaker

connectors

separately.

Sharing

the

negative

wire

of

the

speaker

or

grounding

speaker

wires

to

the

metal

body

of

the

car

can

cause

this

unit

to

fail.

•After

installation,

check

that

the

brake

lamps,

winkers,

and

wipers

work

properly.

Installation

Self-tapping

screw

(04

x

16

mm)

Installation

board,

etc.

(thickness

:

15

mm

or

more)

Since

the

power

amplifier

has

no

parts

which

require

operation,

it

can

be

installed

at

a

position

away

from

the

driver's

seat

without

any

hindrances.

As

generally

accepted

positions

for

its

installation,

places

such

as

inside

the

trunk,

etc.

can

be

considered.

Use

the

extension

cables.

(Optional.)_

---

0.5m

1m

2m

4m

5m

6m

RCA

cable

CA-2SL

CA-12SL

CA-22SL

CA-52SL

RCA

cable

(07mm)

CA-3WL

CA-13WL

CA-23WL

—

CA-53WL

RCA

cable

(0l2mm)

CA-5W

CA-15W

CA-25W

CA~45W

CA-65W

ACAUTION

•

Do

not

install

the

unit

under

the

carpet.

Otherwise

heat

build-up

occurs

and

the

unit

may

be

damaged.

•

Install

this

unit

in

a

location

which

allows

heat

to

easily

dissipate.

Once

installed,

do

not

place

any

object

on

top

of

the

unit.

•

The

surface

temperature

of

the

amplifier

will

become

hot

during

use.

Install

the

amplifier

in

a

place

where

people,

resins,

and

other

substances

that

are

sensitive

to

heat

will

not

come

into

contact

with

it.

•

When

making

a

hole

under

a

seat,

inside

the

trunk,

or

somewhere

else

in

the

vehicle,

check

that

there

is

nothing

hazardous

on

the

opposite

side

such

as

a

gasoline

tank,

brake

pipe,

or

wiring

harness,

and

be

careful

not

to

cause

scratches

or

other

damage.

•

Do

not

install

near

the

dashboard,

rear

tray,

or

air

bag

safety

parts.

•

The

installation

to

the

vehicle

should

securely

fasten

the

unit

to

a

place

in

which

it

will

not

,

obstruct

driving.

If

the

unit

comes

off

due

to

a

shock

and

hits

a

person

or

safety

part,

it

may

cause

injury

or

an

accident.

•

After

installing

the

unit,

check

to

make

sure

that

electrical

equipment

such

as

the

brake

lamps,

turn

signal

lamps

and

windshield

wipers

operate

normally.

...

English

3

Controls

This

is

a

4

channel

amplifier

including

2

stereo

amplifiers

in

a

body.

One

amplifier

is

referred

to

as

amplifier

A

and

the

other

is

amplifier

B.

This

unit

is

compatible

with

a

large

variety

of

systems

by

combining

the

switches

and

functions

described

in

the

following.

®

®

®

(D

Fuse

(20

Ax

2

:

KAC-848)

(30

Ax

1

:

KAC-748)

@

Battery

terminal

©

Ground

terminal

©

Power

control

(REMOTE)

terminal

©

Amplifier

A

speaker

output

terminals

®

Amplifier

B

speaker

output

terminals

4

English

❖

SPEAKER

OUTPUT

terminals

•

Stereo

Connections:

When

you

wish

to

use

the

unit

as

a

stereo

amplifier,

stereo

connections

are

used.

The

speakers

to

be

connected

should

have

an

impedance

of

2Q

or

greater.

When

multiple

speakers

are

to

be

connected,

ensure

that

the

combined

impedance

is

2

Q

or

greater

for

each

channel.

•

Bridged

Connections:

When

you

wish

to

use

the

unit

as

a

high-

output

monaural

amplifier,

bridged

connections

are

used.

(Make

connections

to

the

LEFT

channel

(+)

and

the

RIGHT

channel

(-)

SPEAKER

OUTPUT

terminals.)

The

speakers

to

be

connected

should

have

an

impedance

of

4£1

or

greater.

When

multiple

speakers

are

to

be

connected,

ensure

that

the

combined

impedance

is

4Q

or

greater.

ACAUTION

The

rated

input

of

the

speakers

should

be

no

less

than

the

maximum

output

of

the

amplifier.

Otherwise

malfunction

may

result.

®

Speaker

level

input

terminals

(KAC-748

only)

®

FREQUENCY

control

When

the

FILTER

switch

is

set

to

the

HPF

(High-Pass

Filter)

or

LPF

(Low-Pass

Filter)

position,

the

threshold

frequency

can

be

adjusted

with

this

control.

®

FILTER

switch

High-pass

or

low-pass

filtering

can

be

applied

to

the

speaker

output

according

to

the

setting

of

this

switch.

®

OPERATION

switch

The

amplification

methods

of

the

signals

input

to

amplifiers

A

and

B

can

be

selected

independently

according

to

the

setting

of

this

switch.

•

STEREO

position:

The

amplifier

can

be

used

as

a

stereo

amplifier.

•

L+R

position:

The

input

left

and

right

signals

are

combined

before

being

amplified.

Use

this

position

when

the

unit

is

used

for

subwoofer

speakers

or

the

L+R

(monaural)

sound

is

required.

•

MONO

(Lch)

position:

Amplifies

the

signal

input

from

the

left

side

only.

Set

to

this

position

and

make

bridged

,

connections

to

use

as

a

high-power

monaural

amplifier.

(The

input

right

signal

is

not

output.)

©

INPUT

SENSITIVITY

control

Set

this

control

according

to

the

pre-output

level

of

the

center

unit

connected

with

this

unit,

or

to

the

maximum

power

output

of

the

genuine-accessory

car

stereo.

Use

the

diagram

on

the

right

as

a

guide.

KAC-748

only.

NOTE

|

For

the

pre-output

level

or

the

maximum

power

output,

refer

to

the

"Specifications”

in

the

instruction

manual

of

the

center

unit.

©

RCA

cable

ground

lead

terminal

®

INPUT

SELECTOR

switch

This

switch

selects

the

input

method

of

the

signals

to

be

amplified

by

amplifiers

A

and

GDCB

K)

.

.

INPUT

SELECTOR

•

A

B

position:

Amplifies

both

of

the

signals

input

to

amplifiers

A

and

B.

•

A

position:

Amplifies

only

signal

input

amplifier

A

with

both

amplifiers

A

and

B.

@

Amplifier

A

UNE

IN

terminal

©

Amplifier

B

UNE

IN

terminal

®

LINE

OUT

terminal

These

jacks

output

respectively

the

signals

input

to

amplifiers

A

and

B.

They

always

output

the

stereo

signals

regardless

of

the

position

of

the

OPERATION

switch.

/

English

5

Connection

■

RCA

cable

connection

Do

not

connect

cables

and

leads

to

both

RCA

cable

input

jacks

and

the

speaker

input

terminals

simultaneously,

for

this

may

cause

malfunction

or

damage.

RCA

cable

ground

terminal

0

Left

input

®

Left

input

RCA

cable

ground

terminal

When

using

an

RCA

cable

with

a

ground

lead

attached,

connect

the

ground

lead

to

this

terminal.

ACAUTION

Do

not

use

this

terminal

for

power

source

grounding.

This

unit

will

be

damaged

if

the

power

source

grounding

wire

is

connected

to

this

terminal.

■

Speaker

level

input

connection

(KAC-748

only)

Connect

the

unit

by

inserting

it

in

the

connection

between

the

genuine-accessory

car

stereo

and

speakers.

6

English

•

The

genuine-accessory

car

stereo

shall

have

a

maximum

power

output

of

no

more

than

25

W.

•

Do

not

connect

the

speaker

output

leads

from

a

power

amplifier

(Optional)

to

the

speaker

input

terminals

of

this

unit,

for

this

may

cause

malfunction

or

damage.

•

Do

not

connect

cables

and

leads

to

both

RCA

cable

input

jacks

and

the

speaker

input

terminals

simultaneously,

for

this

may

cause

malfunction

or

damage.

•

Connect

the

power

control

lead

to

a

power

supply

which

can

be

turned

ON/OFF

by

the

ignition

key

switch

(ACC

line).

With

this

connection,

shock

noise

may

be

generated

when

the

power

of

the

genuine-accessory

car

stereo

is

switched

ON/OFF.

■

Speakers

wire

connection

(Stereo

Connections)

(Bridged

Connections)

English

7

Connection

—

I

Speaker

Selection

The

rated

input

power

of

the

speakers

that

are

going

to

be

connected

should

be

greater

than

the

maximum

output

power

(in

Watts)

of

the

amplifier.

Use

of

speakers

having

input

power

ratings

that

are

less

than

the

output

power

of

the

amplifier

will

cause

smoke

to

be

emitted

as

The

impedance

of

the

speakers

that

are

going

to

be

connected

should

be

2Q

or

greater

(for

stereo

connections),

or

4Q

or

greater

(for

bridged

connections).

When

more

than

one

set

of

speakers

are

going

to

be

used,

calculate

the

combined

impedance

of

the

speakers

and

then

connect

suitable

speakers

to

the

amplifier.

Examples:

KAC-848

KAC-748

Stereo

Connections

(4£l)

1

0

0

W

or

greater

__

70

W

or

greater

Bridged

Connections

(4£l)

300

W

or

greater__

200

W

or

greater

O

T

200W

.

<

4

?)

et

200W

(40)

200W"*

(40)

©

:

—f

200W:

+JrUj(2£2)

j

4-,Lrfl200W

i

i

T?U

(2n)

*

i

4

£2.*•

200W®

*

(40)

n:

100W

(80)

100W

(80)

Maximum

output

of

the

amplifier

Combined

impedance

Rated

input

power

and

impedance

of

the

speakers

■

Power

wire

connection

AWARNING~|

To

prevent

fire

caused

by

a

short

in

the

wiring,

connect

a

fusible

link

or

breaker

nearby

the

battery’s

positive

terminal.

buzzing

noise

is

heard

from

the

speakers

when

the

engine

is

running,

connect

a

line

noise

filter

(optional)

to

each

of

the

battery

wire.

^

*

•

Do

not

allow

the

cord

to

directly

contact

the

edge

of

the

iron

plate

by

using

Grommets.

•

Connect

the

ground

wire

to

a

metal

part

of

the

car

chassis

that

acts

as

an

electrical

ground

passing

electricity

to

the

battery’s

negative

©

terminal.

Do

not

turn

the

power

on

if

the

ground

wire

is

not

connected

•

•

Be

sure

to

attach

a

protective

fuse

into

the

battery

wire

close

to

the

battery.

Use

a

protective

fuse

having

a

capacity

that

is

about

10

A

higher

than

the

maximum

current

drawn

by

the

amplifier.

•

Use

vehicle-type

(fire-resistant)

power

supply

wiring

wire

for

the

battery

wire

and

the

ground

wire.

The

current

capacity

of

the

power

supply

wiring

wire

should

be

about

10

A

higher

than

that

of

the

protective

fuse

capacity

(which

means

about

20

A

higher

than

the

maximum

current

drawn

by

the

•

When

more

than

one

power

amplifier

are

going

to

be

used,

use

a

power

supply

wiring

wire

and

protective

fuse

of

greater

current-handling

capacity

than

the

total

maximum

current

drawn

by

each

amplifier.

Example:

One

Power

Amplifier

Is

Used

Model

Maximum

Current

Drawn

KAC-848

38

KAC-748

I

28

A

ross-sectionai

Area

o

Wire

(AWG)

5

mm

2

(AWG

10)

or

greater

x

1

5

mm

2

(AWG

10)

or

greater

x

‘

Power

terminal

,

Connect

to

their

respective

terminals

the

power

control

wire,

power

supply

wire,

and

ground

wire,

all

of

which

pass

through

the

associated

terminal

cover.

Once

the

connections

are

complete,

place

the

cover

on

the

terminal

section.

System

examples

__

I

Full-range

4-channel

+

Subwoofer

system

CENTER

UNIT

LJ

rl

Switch

setting

5®

“t

StBo'g

l»l

l

M»f

_A

■

■

line!

®o

QCHJT;

5

i

Amplifier

Front

speaker

Rear

speaker

[Subwoofer

English

9

(High

pass)**

Subwoofer

(L

+

R)

(Bridged)

•Principle

of

Tri-mode

_

Method

of

frequency

band

division

using

a

coil

and

capatftor***in

case

of

6dB/oct.

slope

Coil

(L):

Passes

low

frequencies

and

blocks

high

frequencies.

(Low

pass)

Capacitor

(Cl:

Passes

high

frequencies

and

blocks

low

frequencies.

(High

pass)

159000

fc

x

R

159

x

R

fc

fc=Cut

of

Frequency

(Hz)

R=Speaker

Impedance

(Q)

•

Example:

When

it

is

required

to

set

a

crossover

frequency

of

120

Hz

using

speakers

with

an

impedance

of

4

ohms

.

Prepare

commercially-available

coil

and

capacitor

with

the

closest

ratings

to

the

results

calculated

from

the

formula

above.

The

capacitor

rating

should

be

as

close

as

possible

to

331.25

(pF)

and

the

coil

rating

should

be

as

close

as

possible

to

5.3

(mH).

•

If

you

wish

to

bridge-connect

a

speaker,

the

speaker

impedance

must

be

no

less

than

4

ohms.

•

Connecting

a

speaker

with

an

impedance

lower

than

4

ohms

may

damage

the

unit.

•

Be

sure

to

connect

capacitors

to

speakers

to

which

high

frequencies

will

be

passed.

Failure

to

do

so

will

result

in

a

drop

of

the

combined

impedance

with

the

subwoofer.

•

Ensure

that

the

withstand

voltage

and

current

ratings

of

the

capacitors

<C)

and

coils

(L)

are

sufficient.

10

English