Kenwood L-08m User manual

NEW

HIGH

SPEED

POWER

AMPLIFIER

1-O3M

INSTRUCTION

MANUAL

@KENWOOD

PRINTED

IN

JAPAN

B50-3293-00

(PM)

(T}

D12345'151

67890N/152

012345/952

67890N:2

23

INTRODUCTION

The

purpose

of

this

manual

is

to

acquaint

you

with

the

operating

features

of

your

new

amplifier.

You

will

notice

that

in

every

detail

of

planning,

engineering,

styling,

operating

convenience,

and

adaptability,

we

have

sought

to

anticipate

your

needs

and

desires.

We

suggest

that

you

read

this

manual

carefully.

Knowing

how

to

set

up

your

amplifier

to

the

best

advantage

will

enhance

your

listening

pleasure

right

from

the

start.

You

will

also

become

aware

of

the

ease

with

which

you

can

adjust

your

amplifier

to

meet

your

special

requirements.

CONTENTS

SYSTEM

PLANNING

CONSIDERATIONS

..........

3

CONTROLS

AND

CONNECTING

INS

TRWE

PIONS

tur

dcnienecsOee

teat

tnat

sede

acai

4

SYSTEM

CONNECTION

DIAGRAM..................

5

BLOCK

DIAGRAM

tess

dcccs

xc

caswtomeanceecmmnte

bee

Grav

SAFERY

PRECAUTIONS

och:

sxe:

anuwexsee

ins

enearares

7

SPECIFICATIONS.

vesuetneastes

weave

tarmeenecessels

8

FOR

YOUR

RECORDS

Record

the

serial

number,

found

on

the

bottom

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

call

upon

your

Kenwood

dealer

for

information

or

service

on

this

pro-

duct.

Model

L-O8M

Serial

number

AFTER

UNPACKING

After

unpacking,

we

recommend

that

you

inspect

and

examine

the

unit

for

any

possible

shipping

damage.

If

your

unit

is

damaged

or

fails

to

operate,

notify

your

dealer

immediately.

If

your

unit

was

shipped

to

you

directly,

notify

the

shipping

company

without

delay.

Only

the

consignee

(the

person

or

company

receiving

the

unit)

can

file

a

claim

against

the

carrier

for

shipping

damage.

We

recommend

that

you

retain

the

original

carton

and

packing

materials

to

prevent

any

damage

should

you

transport

or

ship

your

unit

in

the

future.

INSTALLATION

PRECAUTIONS

a)

Avoid

locations

subject

to

direct

sunlight.

b)

Avoid

high

or

low

temperature

extremes.

c)

Keep

the

unit

away

from

heat

radiating

sources.

d)

Choose

a

location

that

is

relatively

free

of

vibration

or

excessive

dust.

e)}

Make

sure

power

is

off

before

making

any

system

connections.

f)

Allways

place

the

unit

horizontally.

WARNING:

TO

PREVENT

FIRE

OR

SHOCK

HAZARD,

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE.

IMPORTANT!

U.S.A.

AND

CANADA

Units

shipped

to

the

U.S.A.

and

Canada

are

designed

for

operation

on

120

volts

AC

only.

These

units

are

not

equipped

with

AC

Voltage

Selector

switches

and

the

discussion

of

such

switches

that

follows

should

be

disregarded.

ALL

OTHER

COUNTRIES

Units

shipped

to

countries

other

than

the

U.S.A.

and

Canada

are

equipped

with

AC

Voltage

Selector

switches

on

the

bottom

plate.

Refer

to

the

following

paragraph

for

the

proper

setting

of

these

switches.

=

AC

VOLTAGE

SELECTION

This

unit

operates

on

110-120

volts

or

220-240

volts

AC.

The

AC

Voltage

Selector

Switches

on

the

bot-

tom

plate

are

set

to

the

voltage

that

prevails

in

the

area

to

which

the

unit

is

shipped.

Before

connecting

the

power

cord

to

your

AC

outlet,

make

sure

that

the

set-

ting

position

of

these

switches

match

your

line

voltage.

lf

not,

they

must

be

set

to

your

voltage

in

accordance

with

the

following

direction.

Note:

Our

warranty

does

not

cover

damage

caused

by

excessive

line

voltage

due

to

improper

settings

of

the

AC

Voltage

Selector

Switches.

AC

110-120V\

<)>

AC

220-240V~_

AC

110A

20V~

<j»

AC

220-240VV

This

shows

switch

levers

locked

in

110-120V~positions.

This

shows

switch

fevers

locked

in

220-240V~positions

Move

switch

levers

to

match

your

line

voltage

with

a

small

screw

driver

or

other

pointed

tool.

AC

VOLTAGE

SELECTOR

SWITCHES

SYSTEM

PLANNING

CONSIDERATIONS

The

L-O8M

is

a

single

channel

power

amplifier

so

two

units

are

required

for

stereophonic

operation.

REMOTE

POWER

SWITCHING

Since

they

have

built-in

remote

control

power

swit-

ching

circuits,

they

can

be

turned

on

or

off

with

the

power

switch

of

the

L-O8C

control

amplifier.

Remote

contro!

is

also

possible

with

the

Kenwood

L-O7C

or

L-O7C

I

control

amplifiers.

CONNECTION

TO

THE

L-O8C

CONTROL

AMPLIFIER

A

12

meter

length

©

audio

cable

is

supplied

with

the

L-O8C.

Connect

it

between

the

OUTPUT

1

connec-

tor

of

the

L-O8C

and

the

INPUT

jack

of

the

L-O8M.

Always

switch

power

off

before

making

connections.

PLAN

SYSTEM

CAREFULLY

Plan

the

layout

of

your

L-O8M

and

L-O8C

system

carefully

to

avoid

direct

exposure

to

speaker

sound

pressures

since

vibrations

of

amplifier

components

can

affect

sound

quality.

Adverse

effects

may

be

slight,

but

they

can

not

be

overlooked

in

such

a

high

quality

sound

To

amplifier

SPEAKER

terminals

To

©

SENSOR

(+)

terminal

To

(+)

terminal

system

as

this,

in

which

ultimate

sound

is

being

sought.

Keep

air

space

open

at

the

bottom

of

the

unit

if

a

cushion

is

placed

beneath

the

L-O8M.

SPEAKER

CONNECTING

CABLES

Although

ordinary

speaker

cords

can

be

connected

to

the

SPEAKER

terminals,

the

©

(sigma)

drive

system

will

reproduce

better

sound

with

the

©

speaker

cable

(supplied)

connected

to

the

SPEAKER

terminals.

if

the

length

of

the

©

cable

is

too

short

for

your

system,

commercially

available

cables

as

shown

in

Fig.

1

can

be

used.

Pay

attention

to

polarities

when

using

such

cables.

Keep

the

cables

as

short

as

possible.

For

conventional

speaker

connections,

ordinary

2-core

cables

can

be

used.

For

those

connections,

however,

see

page

4

“’

@

SPEAKER

terminals”’

for

full

details.

To

speaker

terminal

(+)

or

(—)

To

(+)

terminal

2-core

flat

cord

x

2

To

(=)

terminal

EZ

To

Z

SENSOR

(—)

terminal

To

£

SENSOR

(+)

terminal

To

(—}

terminal

Twist

and

solder

as

shown.

To

(+)

terminal

To

(+)

terminal

To

(—)

terminal

To

(—)

terminal

To

£

SENSOR

(—)

cama

terminal

Thick

red

wire

To

L

SENSOR

(

+}

terminal

EE:

Thin

red

wire

4-core

flat

cord

Twist

and

solder

as

shown.

Red

wires

To

(+)

terminal

To

(+)

terminal

To

{—)

terminal

To

(~)

terminal

za

To

©

SENSOR

(-)

==

:

terminal

~

Thick

black

wire

~~

Thin

black

wire

Cable

used

should

include

one

pair

of

red

wires

(thick

and

thin)

and

one

pair

Black

wires

Twist

and

so

Ider

as

shown.

of

black

wires

(thick

and

thin).

Fig.

1

Substitute

Cords

for

©

Speaker

Cables

CONTROLS

AND

CONNECTING

INSTRUCTIONS

@

POWER

switch

and

POWER

indicator

Press

this

button

to

turn

power

on

and

light

the

POWER

indicator.

Press

it

again

to

turn

the

power

off.

The

POWER

indicator

should

not

be

lit

(POWER

switch

sould

be

at

off)

when

this

unit

is

switched

by

remote

control.

@

SPEAKER

terminals

Connection

of

the

X

speaker

cable

(supplied)

as

shown

in

Fig.

2

to

all

4

terminals

will

enhance

listening

enjoy-

ment

with

the

improved

sound

quality

of

L

drive.

However,

2-core

cable

connected

only

to

the

2

central

terminals

(+

and

—,

no

shaded)

as

shown

in

Fig.

3

will

drive

the

speaker

in

conventional

manner.

Connect

referring

to

Fig.

2

and

3.

cable

(supptied)

=o

(seen

ae

;

To

speaker

To

amplifier

SPEAKER

terminals

SPEAKER

ey

5-core

white

wires

BA

SENSOR

wna

O

Yap

2-core

white

wires

White

wires

Red

wires

2-core

red

L

cable

(supplied)

wires

5-core

red

mr

Fig.

2

Connection

with

L

Speaker

Cable

SPEAKER

2-core

cord

Observe

polarities

(+)

to

(+),

{—}

to

(—).

Fig.

3

Connecting

Ordinary

Speaker

Cord

Note:

Connect

speakers

rated

at

4

~

16

ohms

to

the

SPEAKER

terminals.

®

*

SENSOR

selector

switch

This

switch

should

ordinarily

be

set

at

ON

and

the

&

drive

system

utilized.

We

recommend

that

it

be

switch-

ed

OFF

for

ordinary

2-core

speaker

connections.

It

should

also

be

at

OFF

to

prevent

hum

when

using

test

equipment

such

as

an

oscilloscope

or

power

meter.

©

Of

400w

MAX

@

UNSWITCHED

outlet

This

AC

outlet

is

convenient

for

connecting

audio

equipment

that

is

switched

separately

from

the

power

amplifier

since

AC

power

is

available

continuously.

Any

equipment

using

this

power

source

should

not

con-

sume

more

than

400

watts.

@

REMOTE

jacks

Connect

the

remote

cord

(supplied)

between

either

of

this

REMOTE

jacks

and

L-O8C’s

REMOTE

jack

or

the

REMOTE

jack

of

L-O8M

that

is

used

in

the

opposite

channel

as

shown

in

the

SYSTEM

CONNECTION

DIAGRAM

on

page

5.

ON/OFF

power

switching

by

remote

control

with

the

power

switch

of

the

L-O8C

can

be

obtained.

@

GND

terminal

Use

the

supplied

grounding

cord

for

connection

here.

The

other

end

of

the

cord

should

be

connected

to

GND

terminal

of

the

L-O8M

that

is

used

in

the

opposite

chan-

-

nel.

@

INPUT

jack

Use

the

©

audio

cable

supplied

with

the

L-O8C

for

con-

nection

to

this

INPUT

jack.

The

other

end

is

connected

to

the

OUTPUT

1

connector

of

the

L-O8C.

Be

sure

to

insert

the

plug

firmly

into

this

jack,

and

lock

the

c

on-

nection

by

turning

the

collar.

SYSTEM

CONNECTION

DIAGRAM

TURNTABLE

with

MM-type

cartridge

with

MC-type

cartridge

TAPE

DECK

A

TAPE

DECK

B

Bo.

wuneae

of0

Oa:

LINE

OUT

R

LINE

IN

L

SQOW

MAX

[TOTAL

200W

MAX

UNSWITCHED

SWITCHED

—?

To

AC

Outlet

Remote

cord

(supplied

with

L-O8M)

E

audio

cable

(supplied

with

L-O8C)

Rik

terminal

(Left)

©

UNSWITCHED.

?

400W

Max

G

NeUT

GND

cord

{supplied

with

L-O8M)

To

AC

Outlet

RIGHT

SPEAKER

Be

sure

to

disconnect

power

to

the

L-O8M

when

connecting

or

disconnecting

the

cables.

BLOCK

DIAGRAM

2nd

dual

cascode

amp

stage

Ist

cascode

amp

stage

Input

Stage

Dual

ASO

Protection

r

Class

A

amp

stage

eh

a53

a2

i

(+)

Speaker

Drive

Terminal

(+)

SENSOR

Output

Terminal

J

|

(—}

SENSOR

Output

Terminal

{=}

Speaker

Drive

Terminal

INPUT

A

Class

Remote

Contro!

Remote

Switch

a

External

=a

Connectors

Transtormer

|

£

‘

|

i

se

b

|

aud)

aa]

Goes

ite

AClass

|

Dp

Power

Relay

Ripple

Filter

|

©

|

a

B

Class

Power

Relay

Z

g

2

3

=

| |

|

—

ae

A

Class

Power

Supply

*

B

Class

__

Powe:

|

Supply

|

Relay

Timing

Circuit

DC

Protection

Circuit

LED

ectivating

Circuit

B

eo

|

eae

ees

THE

©

DRIVE

SYSTEM

The

speaker

cord

and

output

relay

are

included

in

the

sensor

circuit

which

starts

at

the

speaker

enclosure

terminals

in

the

©

drive

system

as

shown

in

Fig.

4.

It

is

a

new

approach

to

control

speaker

cone

vibrations,

which

it

achieves

ideally

to

improve

sound

quality

by

preventing

distortion.

Performance

data

obtained

through

test

measure-

ments

as

shown

in

Fig.

5

and

6

show

improved

sound

reproduction

heretofore

unattainable

with

even

the

highest

quality

circuits.

Thus,

superior

sound

is

assured

with

&

drive,

and

confirmed

by

these

performance

data.

INPUT

Speaker

Cable

vs

Speaker

Hild

Vv

Fig.

4

Principle

of

©

Drive

0.7

0.6,

-

osb-

S

04

~

9.3

6

G2

<q

ol

=

oi

I

Drive

Amplifier

S02

bf

~

0.35

.

eee

—

sa

Se

eae

ETE

—

Conventicnal

D-06

{

Amplifier

O-0.7

-08

0.9F

“48

{

10

(90

tk

10k

FREQUENCY

[Hz]

Fig.

5

Comparison

of

Frequency

Response

of

Mounted

Speakers

between

L

Drive

and

Conventional

Drive

SE

eo

a

3

=

e

_

Conventional

<2)

Amplifier

a

rs)

S

0.01

fe)

Y

Drive

Arqpiitier

7

™

Mounted

$

peakers

<

__&

Drive

Arnplitier

7

9.001

Mounted

3

esistors

<

a

je)

—

6.0001

10

FREQUENCY

[Hz]

All

measurements

were

made

at

the

speaker

end

of

10

m

length

cables

Distortion

is

1/10

to

1/200th

for

£

drive

as

compared

to

conventionalcirive

throughout

the

jow

to

high

frequency

range.

Fig.

6

Comparison

of

Total

Harmonic

Distortio:

of

Mounted

Speakers

SAFETY

PRECAUTIONS

PROTECTION

CIRCUIT

Units

shipped

to

countries

other

than

Canada

are

provided

with

a

protection

circuit

which

cuts

off

output

when

the

temperature

of

the

body

exceeds

a

certain

level.

This

protection

circuit

may

operate

continuously

under

high

ambient

temperatures

(e.g.,

under

direct

sun

light

or

near

a

heater)

when

high

power

is

output.

It

will

recover

in

5

to

10

minutes.

Operation

of

this

circuit

does

not

indicate

that

the

amplifier

is

defective.

It

is

recommended

that

this

amplifier

be

used

in

a

cool,

well-ventilated

place.

MODIFICATIONS

AND

SERVICE

Each

unit

is

shipped

after

it

has

been

carefully

ad-

justed

and

tested

to

provide

optimum

performance.

The

unit

must

not

be

modified

internally.

Unauthorized

modifications

will

void

the

terms

of

the

warranty.

High

voltages

are

used

in

some

of

the

internal

circuits.

Therefore,

do

not

remove

the

cabinet

or

touch

internal

parts.

Refer

all

service

to

qualified

service

personnel.

POWER

CORD

Always

insert

or

remove

the

power

plug

from

the

AC

outlet

by

grasping

the

plug

body.

Never

pull

or

stretch

the

cord.

Take

care

that

the

cord

is

not

subject

to

traffic

or

bent

sharply

around

furniture.

Keep

heavy

objects

off

the

cord;

never

route

it

under

rugs,

and

avoid

the

use

of

extra

extension

cords.

Attention

to

these

precautions

will

avoid

fire

or

shock

hazards.

WARNING

Particular

attention

must

be

given

to

making

good

electrical

contact

at

the

amplifier-output

and

speaker

terminals.

Poor

or

loose

connections

can

cause

sparking

or

burning

at

the

terminals

because

of

the

very

high

power

that

the

amplifier

can

deliver.

Follow

these

steps

carefully.

1.

Back

the

caps

of

the

SPEAKER

terminals

on

the

amplifier

all

the

way

out

by

turning

them

counterclockwise

as

far

as

they

will

go.

2.

Insert

5-core

red

wires

into

the

hole

in

the

+

terminal

as

shown

at

right.

3.

Turn

the

cap

clockwise

and

tighten

securely

to

en-

Sure

a

firm

contact.

4.

Connections

at

your

speakers

will

vary

depending

Upon

the

type

of

terminals

used.

Check

the

manufacturer's

instructions

and

make

sure

that

a

good,

tight,

metal-to-metal

contact

is

made.

5.

Check

all

connections.

Make

sure

all

are

tight,

and

that

there

are

no

loose

strands

of

wire

touching

the

wrong

terminals,

metal

cabinet

or

trim.

POWER

PLUG

e

Switch

off

the

unit

and

disconnect

the

power

plug

from

your

AC

outlet

immediately

if

the

abnormality

should

take

place.

e

it

is

desirable

to

disconnect

the

power

plug

from

your

AC

outlet

when

you

leave

your

house

for

a

long

time.

CLEANING

Do

not

use

volatile

solvents

such

as

alcohol,

paint

thinner,

gasoline,

benzine,

etc.

to

clean

the

cabinet.

Use

a

silicone

cloth

or

a

clean

dry

cloth.

———-——

speaker

cable

(supplied)

Fig.

7

Speaker

Cable

Connection

SPECIFICATIONS

POWER

AMPLIFIER

SECTION

Power

Output

170

watts*

minimum

power,

RMS

at

8

ohms

from

20

Hz

to

20,000

Hz

with

no

more

than

0.003%

total

harmonic

distortion.

Continuous

Power

into

8

ohms

at

1,000

Hz

.........

0...

ceeee

ee ee

eee

170

W

Dynamic

Power

Output

into

4

ohms

at

1,000

HZ............ccccesseeee

eee

es

400

W

;

Total

Harmonic

Distortion

(20

Hz

to

20

kHz)

rated

power

into

8

OhMS..............0.:seceeeeeeeees

0.003%

rated

power

into

8

ohms

at

1,000

Hz............

0.001%

Intermodulation

Distortion

(60

Hz:7

kHz=4:

1)

!

rated

power

into

8

OMMS...........:csececeeeeeee

eens

0.001%

Transient

Response

RISE

PIMC

seidincccnsocdoeces

hase

loi

ieee

tcesdbatenaed

ese

0.6ys

Slew

Rate

...+

200

Vins

Damping

Factor

...........-..:ceeececeeeeeeeenseeeeeeeenenes

15,000

at

55

Hz

Input

Sensitivity/Impedance.................cccseeeeeees

1

V/50

kohms

Signa!-to-Noise

Ratio

(IHF-A)...

..-116

dB

Frequency

Response................0ceceeceeeeneeeseneeens

DC

to

600

kHz

+0

dB,

—3.0

dB

GENERAL

Power

Consumption

.............cscecceceneeeeseeeeeeeenes

4.2

A

(UL

and

CSA)

560

W

(IEC)

40

W

(No

Signal)

AC

Outlets

ccc5cccecst

ebecccisien

ce

ces

ten

ceetseeeideveas

Unswitched

1

DIMENSIONS

esas

esccs

es

oessec

ee

cece

eee

teeeneectasadenonsse

W:

185

mm

(7-9/32”}

H:

235

mm

(9-1/4”)

D:

369

mm

(14-17/32”)

Weight

(Net)

..............::ccceeeceeeeeee

ee

eeeeeeeeeeeeeuees

12.5

kg

(27.5

Ib)

(Gross)

seid

cchestices

Tiegtriapaces

states

oe

eetveyy

14.0 kg

(30.8

Ib)

*

Measured

pursuant

to

Federal

Trade

Commission's

Trade

Regulation

rule

on

Power

Output

Claims

for

Amplifier

in

U.S.A.

Note:

Kenwood

follows

a

policy

of

continuous

advancements

in

development.

For

this

reason

specifications

may

be

changed

without

notice.

Kenwood L-08M User manual

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