Kenwood L-08M Manuale utente

NEW

HIGH

SPEED

POWER

AMPLIFIER

1-O3M

INSTRUCTION

MANUAL

@KENWOOD

PRINTED

JAPAN

B50-3293-00

(PM)

(T}

D12345'151

67890N/152

012345/952

67890N:2

INTRODUCTION

The

purpose

this

manual

acquaint

you

with

the

operating

features

your

new

amplifier.

You

will

notice

that

every

detail

planning,

engineering,

styling,

operating

convenience,

and

adaptability,

have

sought

anticipate

your

needs

and

desires.

suggest

that

you

read

this

manual

carefully.

Knowing

how

set

your

amplifier

the

best

advantage

will

enhance

your

listening

pleasure

right

from

the

start.

You

will

also

become

aware

the

ease

with

which

you

can

adjust

your

amplifier

meet

your

special

requirements.

CONTENTS

SYSTEM

PLANNING

CONSIDERATIONS

..........

CONTROLS

AND

CONNECTING

INS

TRWE

PIONS

tur

dcnienecsOee

teat

tnat

sede

acai

SYSTEM

CONNECTION

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

BLOCK

DIAGRAM

tess

dcccs

caswtomeanceecmmnte

bee

Grav

SAFERY

PRECAUTIONS

och:

sxe:

anuwexsee

ins

enearares

SPECIFICATIONS.

vesuetneastes

weave

tarmeenecessels

FOR

YOUR

RECORDS

Record

the

serial

number,

found

the

bottom

the

unit,

the

spaces

designated

the

warranty

card,

and

the

space

provided

below.

Refer

the

model

and

serial

numbers

whenever

you

call

upon

your

Kenwood

dealer

for

information

service

this

pro-

duct.

Model

L-O8M

Serial

number

AFTER

UNPACKING

After

unpacking,

recommend

that

you

inspect

and

examine

the

unit

for

any

possible

shipping

damage.

your

unit

damaged

fails

operate,

notify

your

dealer

immediately.

your

unit

was

shipped

you

directly,

notify

the

shipping

company

without

delay.

Only

the

consignee

(the

person

company

receiving

the

unit)

can

file

claim

against

the

carrier

for

shipping

damage.

recommend

that

you

retain

the

original

carton

and

packing

materials

prevent

any

damage

should

you

transport

ship

your

unit

the

future.

INSTALLATION

PRECAUTIONS

Avoid

locations

subject

direct

sunlight.

Avoid

high

low

temperature

extremes.

Keep

the

unit

away

from

heat

radiating

sources.

Choose

location

that

relatively

free

vibration

excessive

dust.

e)}

Make

sure

power

off

before

making

any

system

connections.

Allways

place

the

unit

horizontally.

WARNING:

PREVENT

FIRE

SHOCK

HAZARD,

NOT

EXPOSE

THIS

APPLIANCE

RAIN

MOISTURE.

IMPORTANT!

U.S.A.

AND

CANADA

Units

shipped

the

U.S.A.

and

Canada

are

designed

for

operation

120

volts

only.

These

units

are

not

equipped

with

Voltage

Selector

switches

and

the

discussion

such

switches

that

follows

should

disregarded.

ALL

OTHER

COUNTRIES

Units

shipped

countries

other

than

the

U.S.A.

and

Canada

are

equipped

with

Voltage

Selector

switches

the

bottom

plate.

Refer

the

following

paragraph

for

the

proper

setting

these

switches.

VOLTAGE

SELECTION

This

unit

operates

110-120

volts

220-240

volts

AC.

The

Voltage

Selector

Switches

the

bot-

tom

plate

are

set

the

voltage

that

prevails

the

area

which

the

unit

shipped.

Before

connecting

the

power

cord

your

outlet,

make

sure

that

the

set-

ting

position

these

switches

match

your

line

voltage.

not,

they

must

set

your

voltage

accordance

with

the

following

direction.

Note:

Our

warranty

does

not

cover

damage

caused

excessive

line

voltage

due

improper

settings

the

Voltage

Selector

Switches.

110-120V\

<)>

220-240V~_

110A

20V~

<j»

220-240VV

This

shows

switch

levers

locked

110-120V~positions.

This

shows

switch

fevers

locked

220-240V~positions

Move

switch

levers

match

your

line

voltage

with

small

screw

driver

other

pointed

tool.

VOLTAGE

SELECTOR

SWITCHES

SYSTEM

PLANNING

CONSIDERATIONS

The

L-O8M

single

channel

power

amplifier

two

units

are

required

for

stereophonic

operation.

REMOTE

POWER

SWITCHING

Since

they

have

built-in

remote

control

power

swit-

ching

circuits,

they

can

turned

off

with

the

power

switch

the

L-O8C

control

amplifier.

Remote

contro!

also

possible

with

the

Kenwood

L-O7C

control

amplifiers.

CONNECTION

THE

L-O8C

CONTROL

AMPLIFIER

meter

length

audio

cable

supplied

with

the

L-O8C.

Connect

between

the

OUTPUT

connec-

tor

the

L-O8C

and

the

INPUT

jack

the

L-O8M.

Always

switch

power

off

before

making

connections.

PLAN

SYSTEM

CAREFULLY

Plan

the

layout

your

L-O8M

and

L-O8C

system

carefully

avoid

direct

exposure

speaker

sound

pressures

since

vibrations

amplifier

components

can

affect

sound

quality.

Adverse

effects

may

slight,

but

they

can

not

overlooked

such

high

quality

sound

amplifier

SPEAKER

terminals

SENSOR

(+)

terminal

(+)

terminal

system

this,

which

ultimate

sound

being

sought.

Keep

air

space

open

the

bottom

the

unit

cushion

placed

beneath

the

L-O8M.

SPEAKER

CONNECTING

CABLES

Although

ordinary

speaker

cords

can

connected

the

SPEAKER

terminals,

the

(sigma)

drive

system

will

reproduce

better

sound

with

the

speaker

cable

(supplied)

connected

the

SPEAKER

terminals.

the

length

the

cable

too

short

for

your

system,

commercially

available

cables

shown

Fig.

can

used.

Pay

attention

polarities

when

using

such

cables.

Keep

the

cables

short

possible.

For

conventional

speaker

connections,

ordinary

2-core

cables

can

used.

For

those

connections,

however,

see

page

“’

SPEAKER

terminals”’

for

full

details.

speaker

terminal

(+)

(—)

(+)

terminal

2-core

flat

cord

(=)

terminal

SENSOR

(—)

terminal

SENSOR

(+)

terminal

(—}

terminal

Twist

and

solder

shown.

(+)

terminal

(+)

terminal

(—)

terminal

(—)

terminal

SENSOR

(—)

cama

terminal

Thick

red

wire

SENSOR

(

terminal

EE:

Thin

red

wire

4-core

flat

cord

Twist

and

solder

shown.

Red

wires

(+)

terminal

(+)

terminal

{—)

terminal

(~)

terminal

SENSOR

(-)

terminal

Thick

black

wire

Thin

black

wire

Cable

used

should

include

one

pair

red

wires

(thick

and

thin)

and

one

pair

Black

wires

Twist

and

Ider

shown.

black

wires

(thick

and

thin).

Fig.

Substitute

Cords

for

Speaker

Cables

CONTROLS

AND

CONNECTING

INSTRUCTIONS

POWER

switch

and

POWER

indicator

Press

this

button

turn

power

and

light

the

POWER

indicator.

Press

again

turn

the

power

off.

The

POWER

indicator

should

not

lit

(POWER

switch

sould

off)

when

this

unit

switched

remote

control.

SPEAKER

terminals

Connection

the

speaker

cable

(supplied)

shown

Fig.

all

terminals

will

enhance

listening

enjoy-

ment

with

the

improved

sound

quality

drive.

However,

2-core

cable

connected

only

the

central

terminals

and

—,

shaded)

shown

Fig.

will

drive

the

speaker

conventional

manner.

Connect

referring

Fig.

and

cable

(supptied)

(seen

;

speaker

amplifier

SPEAKER

terminals

SPEAKER

5-core

white

wires

SENSOR

wna

Yap

2-core

white

wires

White

wires

Red

wires

2-core

red

cable

(supplied)

wires

5-core

red

Fig.

Connection

with

Speaker

Cable

SPEAKER

2-core

cord

Observe

polarities

(+)

(+),

{—}

(—).

Fig.

Connecting

Ordinary

Speaker

Cord

Note:

Connect

speakers

rated

ohms

the

SPEAKER

terminals.

SENSOR

selector

switch

This

switch

should

ordinarily

set

and

the

drive

system

utilized.

recommend

that

switch-

OFF

for

ordinary

2-core

speaker

connections.

should

also

OFF

prevent

hum

when

using

test

equipment

such

oscilloscope

power

meter.

400w

MAX

UNSWITCHED

outlet

This

outlet

convenient

for

connecting

audio

equipment

that

switched

separately

from

the

power

amplifier

since

power

available

continuously.

Any

equipment

using

this

power

source

should

not

con-

sume

than

400

watts.

REMOTE

jacks

Connect

the

remote

cord

(supplied)

between

either

this

REMOTE

jacks

and

L-O8C’s

REMOTE

jack

the

REMOTE

jack

L-O8M

that

used

the

opposite

channel

shown

the

SYSTEM

CONNECTION

DIAGRAM

page

ON/OFF

power

switching

remote

control

with

the

power

switch

the

L-O8C

can

obtained.

GND

terminal

Use

the

supplied

grounding

cord

for

connection

here.

The

other

end

the

cord

should

connected

GND

terminal

the

L-O8M

that

used

the

opposite

chan-

nel.

INPUT

jack

Use

the

audio

cable

supplied

with

the

L-O8C

for

con-

nection

this

INPUT

jack.

The

other

end

connected

the

OUTPUT

connector

the

L-O8C.

sure

insert

the

plug

firmly

into

this

jack,

and

lock

the

on-

nection

turning

the

collar.

SYSTEM

CONNECTION

DIAGRAM

TURNTABLE

with

MM-type

cartridge

with

MC-type

cartridge

TAPE

DECK

TAPE

DECK

Bo.

wuneae

of0

Oa:

LINE

OUT

LINE

SQOW

MAX

[TOTAL

200W

MAX

UNSWITCHED

SWITCHED

—?

Outlet

Remote

cord

(supplied

with

L-O8M)

audio

cable

(supplied

with

L-O8C)

Rik

terminal

(Left)

UNSWITCHED.

400W

Max

NeUT

GND

cord

{supplied

with

L-O8M)

Outlet

RIGHT

SPEAKER

sure

disconnect

power

the

L-O8M

when

connecting

disconnecting

the

cables.

BLOCK

DIAGRAM

2nd

dual

cascode

amp

stage

Ist

cascode

amp

stage

Input

Stage

Dual

ASO

Protection

Class

amp

stage

a53

(+)

Speaker

Drive

Terminal

(+)

SENSOR

Output

Terminal

(—}

SENSOR

Output

Terminal

{=}

Speaker

Drive

Terminal

INPUT

Class

Remote

Contro!

Remote

Switch

External

Connectors

Transtormer

‘

aud)

aa]

Goes

ite

AClass

Power

Relay

Ripple

Filter

Class

Power

Relay

| |

—

Class

Power

Supply

Class

Powe:

Supply

Relay

Timing

Circuit

Protection

Circuit

LED

ectivating

Circuit

eae

ees

THE

DRIVE

SYSTEM

The

speaker

cord

and

output

relay

are

included

the

sensor

circuit

which

starts

the

speaker

enclosure

terminals

the

drive

system

shown

Fig.

new

approach

control

speaker

cone

vibrations,

which

achieves

ideally

improve

sound

quality

preventing

distortion.

Performance

data

obtained

through

test

measure-

ments

shown

Fig.

and

show

improved

sound

reproduction

heretofore

unattainable

with

even

the

highest

quality

circuits.

Thus,

superior

sound

assured

with

drive,

and

confirmed

these

performance

data.

INPUT

Speaker

Cable

Speaker

Hild

Fig.

Principle

Drive

0.7

0.6,

osb-

9.3

Drive

Amplifier

S02

0.35

eee

—

eae

ETE

—

Conventicnal

D-06

{

Amplifier

O-0.7

-08

0.9F

“48

{

(90

10k

FREQUENCY

[Hz]

Fig.

Comparison

Frequency

Response

Mounted

Speakers

between

Drive

and

Conventional

Drive

Conventional

<2)

Amplifier

rs)

0.01

fe)

Drive

Arqpiitier

™

Mounted

peakers

__&

Drive

Arnplitier

9.001

Mounted

esistors

je)

—

6.0001

FREQUENCY

[Hz]

All

measurements

were

made

the

speaker

end

length

cables

Distortion

1/10

1/200th

for

drive

compared

conventionalcirive

throughout

the

jow

high

frequency

range.

Fig.

Comparison

Total

Harmonic

Distortio:

Mounted

Speakers

SAFETY

PRECAUTIONS

PROTECTION

CIRCUIT

Units

shipped

countries

other

than

Canada

are

provided

with

protection

circuit

which

cuts

off

output

when

the

temperature

the

body

exceeds

certain

level.

This

protection

circuit

may

operate

continuously

under

high

ambient

temperatures

(e.g.,

under

direct

sun

light

near

heater)

when

high

power

output.

will

recover

minutes.

Operation

this

circuit

does

not

indicate

that

the

amplifier

defective.

recommended

that

this

amplifier

used

cool,

well-ventilated

place.

MODIFICATIONS

AND

SERVICE

Each

unit

shipped

after

has

been

carefully

ad-

justed

and

tested

provide

optimum

performance.

The

unit

must

not

modified

internally.

Unauthorized

modifications

will

void

the

terms

the

warranty.

High

voltages

are

used

some

the

internal

circuits.

Therefore,

not

remove

the

cabinet

touch

internal

parts.

Refer

all

service

qualified

service

personnel.

POWER

CORD

Always

insert

remove

the

power

plug

from

the

outlet

grasping

the

plug

body.

Never

pull

stretch

the

cord.

Take

care

that

the

cord

not

subject

traffic

bent

sharply

around

furniture.

Keep

heavy

objects

off

the

cord;

never

route

under

rugs,

and

avoid

the

use

extra

extension

cords.

Attention

these

precautions

will

avoid

fire

shock

hazards.

WARNING

Particular

attention

must

given

making

good

electrical

contact

the

amplifier-output

and

speaker

terminals.

Poor

loose

connections

can

cause

sparking

burning

the

terminals

because

the

very

high

power

that

the

amplifier

can

deliver.

these

steps

carefully.

Back

the

caps

the

SPEAKER

terminals

the

amplifier

all

the

way

out

turning

them

counterclockwise

far

they

will

go.

Insert

5-core

red

wires

into

the

hole

the

terminal

shown

right.

Turn

the

cap

clockwise

and

tighten

securely

en-

Sure

firm

contact.

Connections

your

speakers

will

vary

depending

Upon

the

type

terminals

used.

Check

the

manufacturer's

instructions

and

make

sure

that

good,

tight,

metal-to-metal

contact

made.

Check

all

connections.

Make

sure

all

are

tight,

and

that

there

are

loose

strands

wire

touching

the

wrong

terminals,

metal

cabinet

trim.

POWER

PLUG

Switch

off

the

unit

and

disconnect

the

power

plug

from

your

outlet

immediately

the

abnormality

should

take

place.

desirable

disconnect

the

power

plug

from

your

outlet

when

you

leave

your

house

for

long

time.

CLEANING

not

use

volatile

solvents

such

alcohol,

paint

thinner,

gasoline,

benzine,

etc.

clean

the

cabinet.

Use

silicone

cloth

clean

dry

cloth.

———-——

speaker

cable

(supplied)

Fig.

Speaker

Cable

Connection

SPECIFICATIONS

POWER

AMPLIFIER

SECTION

Power

Output

170

watts*

minimum

power,

RMS

ohms

from

20,000

with

than

0.003%

total

harmonic

distortion.

Continuous

Power

into

ohms

1,000

.........

0...

ceeee

ee ee

eee

170

Dynamic

Power

Output

into

ohms

1,000

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

eee

400

;

Total

Harmonic

Distortion

(20

kHz)

rated

power

into

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

0.003%

rated

power

into

ohms

1,000

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

0.001%

Intermodulation

Distortion

(60

Hz:7

kHz=4:

rated

power

into

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

Input

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

V/50

kohms

Signa!-to-Noise

Ratio

(IHF-A)...

..-116

Frequency

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

600

kHz

dB,

—3.0

GENERAL

Power

Consumption

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

4.2

(UL

and

CSA)

560

(IEC)

(No

Signal)

Outlets

ccc5cccecst

ebecccisien

ces

ten

ceetseeeideveas

Unswitched

DIMENSIONS

esas

esccs

oessec

cece

eee

teeeneectasadenonsse

185

(7-9/32”}

235

(9-1/4”)

369

(14-17/32”)

Weight

(Net)

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

eeeeeeeeeeeeeuees

12.5

(27.5

Ib)

(Gross)

seid

cchestices

Tiegtriapaces

states

eetveyy

14.0 kg

(30.8

Ib)

Measured

pursuant

Federal

Trade

Commission's

Trade

Regulation

rule

Power

Output

Claims

for

Amplifier

U.S.A.

Note:

Kenwood

follows

policy

continuous

advancements

development.

For

this

reason

specifications

may

changed

without

notice.

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