Kenwood Ra-54 User manual

STEREO

REVERBERATION

AMPLIFIER

RA-54

INSTRUCTION

MANUAL

KENWOOD

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

call

upon

your

dealer

for

infor-

mation

or

service

on

this

product.

Model

Serial

number

Unpacking

Unpack

the

unit

carefully

and

make

sure

that

all

accessories

and

cables

are

put

aside

so

they

will

not

be

lost.

Examine

the

unit

for

any

possibility

of

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

for

use

should

you

transport

or

ship

the

unit

in

the

future.

Important!

U.S.A.,

Canada,

Australia,

U.K.

and

Europe

These

units

are

not

equipped

with

an

AC

voltage

selector

switch

and

the

discussion

of

such

a

switch

that

follows

should

be

disregarded.

All

other

countries

Units

shipped

to

countries

other

than

U.S.A.,

Canada,

Australia,

U.K.

and

Europe

are

equipped

with

an

AC

voltage

selector

switch

on

the

rear

panel.

Refer

to

the

following

paragraph

for

the

proper

setting

of

this

switch.

AC

voltage

selection

This

unit

operates

on

110-120

volts

or

220-240

volts

AC.The

AC

voltage

selector

switch

on

the

rear

panel

is

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

setting

position

of

this

switch

matches

your

line

voltage.

If

not,

it

must

be

set

to

your

voltage

in

accordance

with

the

following

direction.

Note:

Our

waranty

does

not

cover

damage

caused

by

excessive

line

voltage

due

to

improper

setting

of

the

AC

voltage

selector

switch.

AC

110-120V~

«pm

AC

220-240V~

AC

110-120V~

4m

AC

220-240V~,

Switch

lever

ois

@

—®

)

This

shows

switch

This

shows

switch

lever

is

locked

in

lever

is

locked

in

110-120V~

220-240V~

position.

Move

switch

lever

to

match

your

line

voltage

with

a

small

screwdriver

or

other

pointed

tool.

AC

voltage

selector

switch

For

United

Kingdom

The

mains

plug

must

be

removed

from

the

wail

socket

prior

to

any

internal

examination.

Important

The

wires

in

this

mains

lead

are

coloured

in

accordance

with

the

following

code:

The

wires

in

this

mains

lead

must

be

connected

to

the

terminals

in

the

plug

as

follows:

Wire

colour

Plug

terminal

marking

N

or

Black

L

or

Red

Brown

to

Live

Blue

to

Neutral

Plug

Notes:

@

——____________________

1)

If

a

13-amp

plug

is

used,

this

must

be

fitted

with

a

5-amp

fuse.

2)

If

a

3-pin

plug

with

earthing

contact

is

used,

no

wire

must

be

connected

to

the

E

terminal.

WARNING:

TO

PREVENT

FIRE

OR

ELECTRIC

SHOCK

DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE.

PRINTED

IN

JAPAN

B50-5689-00

(K,M,X,E)

(T)

E

6789101112/85

123456789101

112/86

Controls

and

indicators

REVERBERATION

AMPLIFIER

RA-54

ATTENJATOR

REVERB!

@

POWER

switch

Depress

the

power

switch

and

the

lamp

at

the

center

of

the

reverberation

indicator

will

light,

indicating

that

the

power

is

ON.

To

turn

off

the

power,

depress

the

switch

again.

@

MIC

jack

Used

to

connect

microphone.

©

MIXING

control

To

raise

volume

level

of

microphones,

turn

this

control

clockwise.

To.

raise

volume

level

of

sources,

turn

this

control

counterclockwise.

When

the

microphone

is

not

used,

set

this

control

to

SOURCE.

©

TAPE

monitor

switch

ON:

To

playback

a

tape

deck

connected

to

the

amplifier

or

to

monitor

the

sound

being

recorded.

OFF:

To

listen

to

other

program

sources

(FM/AM,

turntable,

microphone,

etc.)

connected

to

the

amplifier.

@®

FUNCTION

switch

SOURCE/MIC:

To

add

reverberation

effect

on

to

both

sources

and

microphone

sound.

MIC:

To

add

reverberation

effect

only

on

to

micro-

phone

sound.

Safety

precautions

CAUTION

RISK

OF

ELECTRIC

SHOCK

DO

NOT

OPEN

@

EFFECT

switch

To

obtain

a

normal

reverberation

effect,

set

this

switch

to

the

1

position

(2).

To

obtain

a

dual

effect,

set

the

switch

to

the

2

position

(.).

@

Reverberation

indicator

This

is

used

to

visually

check

the

reverberation

effect.

The

lights

of

the

indicator

lamps

will

spread

to

left

and

right

according

to

the

strength

of

reverberation.

@

REVERB

TIME

control

Adjusts

the

reverberation

time.

With

the

effect

switch

in

the

1

position,

the

reverberation

time

is

adjustable

from

O

to

2.5

sec.,

and

in

the

2

position,

from

30

to

80

msec.

@

DEPTH

control

Adjusts

the

amount

of

reverberation.

Turning

the

con-

trol

clockwise

will

emphasize

the

reverberation.

@

REVERBERATION

switch

This

switch

turns

the

reverberation

unit

ON

and

OFF.

@®

ATTENUATOR

switch

This

switch

is

used

to

reduce

the

input

level

to

1/2,

eliminating

any

possibility

of

distortion

due

to

high

input

signals.

CAUTION:

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK).

NO

USER-SERVICEABLE

PARTS

INSIDE.

REFER

SERVIC-

ING

TO

QUALIFIED

SERVICE

PERSONNEL.

The

lightning

flash

with

arrowhead

symbol,

within

an

equilateral

triangle,

is

intended

to

alert

the

user

to

the

presence

of

uninsulated

‘dangerous

voltage’

within

the

product's

enclosure;

that

may

be

of

sufficient

magnitude

to

con-

stitute

a

risk

of

electric

shock

to

persons.

The

exclamation

point

within

an

equilateral

triangle

is

intended

to

alert

the

user

to

the

presence

of

important

operating

and

maintenance

(servicing)

in-

structions

in

the

literature

accompanying

the

appliance.

2

RA-54

(K)

System

connections/Operating

instructions

Turntable

Speaker

system

Pre-main

amplifier

TAPE

REC

PLAY

©@Ox2

Not

for

U.K.,

Australia

and

Europe

Tape

deck

SB

OORT

SBoonno

coo

Connections

and

precautions

1.

Each

connecting

cord

must

be

connected

securely

to

the

corresponding

terminals

(R

to

R

and

L

to

L).

Poor

connection

can

result

in

production

of

noise.

.

Before

connecting

or

disconnecting

any

cord,

be

Sure

to

turn

off

the

POWER

switches

of

the

RA-54

and

pre-main

amplifier.

.

Do

not

bind

the

input/output

cords

together

with

the

power

cord

and

speaker

cord.

Do

not

extend

the

in-

put/output

cords

unnecessarily

to

avoid

the

possibility

of

producing

noise

or

deterioration

of

tonal

quality.

)

Safety

precaution

for

AC

plug

(For

Canada)

CAUTION:

TO

PREVENT

ELECTRIC

SHOCK

DO

NOT

USE

THIS

(POLARIZED)

PLUG

WITH

AN

EXTENSION

CORD,

RECEPTACLE

OR

OTHER

OUTLET UNLESS

THE

BLADES

CAN

BE

FULLY

INSERTED

TO

PREVENT

BLADE

EXPOSURE.

-

UNSWITCHED

100W

MAX.

(+r)

To

AC

outlet

AC

outlet

(UNSWITCHED)

This

outiet

provides

power

when

the

unit

is

plugged

into

an

active

AC

wail

outlet,

regardless

of

the

setting

of

the

POWER

switch.

Its

maximum

capacity

is

100

watts.

Operating

procedure

1.

2.

3.

Depress

the

POWER

switch

to

turn

on

the

power.

Set

the

pre-main

amplifier

tape

monitor

switch

to

TAPE

or

ON.

For

playback

of

tape,

set

the

TAPE

monitor

switch

to

ON.

For

listening

to

other

program’sources,

set

the

switch

to

OFF.

Set

the

REVERBERATION

switch

to

ON.

.

Set

the

EFFECT

switch

to

the

desired

position.

.

Adjust

the

REVERB

TIME

control

and

DEPTH

contro!

as

required.

.

When

the

microphone

is

used,

set

the

FUNCTION

switch

to

SOURCE/MIC,

to

add

the

reverberation

ef-

fect

on

to

both

sources

and

to

microphone

sound.

Adjust

the

relative

sound

level

between

source

and

microphone

with

the

MIXING

control.

To

add

the

reverberation

effect

only

on

to

microphone

sound,

set

this

switch

to

MIC.

.

To

eliminate

the

reverberation

effect,

release

the

REVERBERATION

switch.

RA-64

(K)

3

Connection

diagram

Connection

diagram

for

amplifier

with

two

pairs

of

tape

jacks

2nd

cassette

deck

Main

cassette

deck

Reverberation

amp.

TAPE

EC

PLAY

LINE

TAPE

REC

PLAY

© @

Graphic

equalizer

@i\e

Amp.

a

REC

PLAY

Cassette

deck

IN

ye

QUT

Reverberation

amp.

RA-54

(K)

4

Operation

guide

The

operating

procedures

when

the

optional

accessories

are

connected

are

as

follows.

Ex.

When

the

GE-54

and

RA-54

are

connected

<

Listening

mode

>

When

the

amplifier

is

equipped

with

two

pairs

of

tape

jacks

PHONO,

TUNER,

CD,

AUX,

VIDEO

or

TAPE

2

Same

for

PHONO

DIRECT

CDIAUX

or

REC

TAPE

2

TAPE

1

Same

for

PHONO

DIRECT

When

the

amplifier

is

equipped

with

one

pair

of

tape

jacks

PHONO,

TUNER

or

CD/AUX

SSS

CTIAER

or

CD/AUX

se

ae

|

SOURCEME

|

SOURCE/MIC

<

Recording

mode

>

When

the

amplifier

is

equipped

with

two

pairs

of

tape

jacks

Operation

mode

PHONO,

TUNER

or

CDIAUX

PHONO,

TUNER,

or

CD,

AUX,

VIDEO

(to

TAPE

2}

Not

applicable

Tape

1

{to

TAPE

2)

Not

applicable

(VIDEO)

PHONO

PHONO,

DIRECT

RECORDING

TUNER

(to

TAPE

1)

CD/AUX

-

—

PHONO,

TUNER,

CD/AUX

or

TUNER,

TAPE

2

(to

TAPE

1)

CD/AUX

or

iad

snes

ae

SOURCE/MIC

When

the

amplifier

is

equipped

with

one

pair

of

tape

jacks

PH

IN

dese

-——~

|ONO,

TUNER,

or

CD/AUX

TUNER,

os

{to

TAPE)

CDy

AUX

SOURCE/MIC

*

First,

set

the

unit

to

the

tape

monitor

mode.

Then,

set

the

unit

to

the

recording

mode.

5

RA-54

ik)

Safety

precautions

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.

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

trafic

or

bent

sharply

around

furniture.

Keep

heavy

objects

off

the

cord;

never

route

it

under

rugs,

and

avoid

the

use

of

extra

extension

cord.

At-

tention

to

these

precautions

will

avoid

fire

or

shock

hazards.

In

case

of

difficulty

Service

or

modifications

Do

not

remove

the

cabinet

or

touch

internal

parts.

Refer

all

service

to

qualified

service

personnel.

Unauthorized

modifica-

tions

can

result

in

a

dangerous

shock

hazard

and

can

void

the

warranty.

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

con-

nections.

If

your

unit

should

not

perform

as

expected,

consult

the

table

below

to

see

if

the

problem

can

be

corrected

before

seeking

help

from

your

dealer

or

service

representatives.

No

sound

although

AC

is

switched

on.|

Poor

AC

plug

connection.

Check

plug

contact.

;

Indicator

not

illuminated.

No

sound

from

LEFT

and

RIGHT.

1.

Speaker

cables

disconnected.

2.

Volume

control

of

amplifier

fully

counterclockwise.

3.

Tape

monitor

switch

of

amplifier

set

to

SOURCE.

4.

Tape

monitor

switch

of

GE-54

or

RA-54

set

to

ON.

.

Turn

up

volume

control.

3.

Set

tape

monitor

switch

of

amplifier

.

Set

tape

monitor

switch

to

OFF

ex-

Check

speaker

connections.

to

TAPE.

cept

when

using

tape

deck.

Sound

from

one

side

only.

1.

Speaker

cords

disconnected.

2.

Input

or

output

cables

disconnected.

3.

Balance

control

of

amplifier

set

to

.

Check

speaker

connections.

.

Check

input

or

output

connections.

.

Adjust

balance

control

of

amplifier.

one

extreme

or

the

others.

Specifications

Reverberation

time

Reverberating

time...................

ce

ceeseeeeeeeeee

es

O—2.5sec.

(Effect

1)

Delay

tim

Gs

lee

soo.

toes

code

ver

bibs

ate

Rad

eancem

need

ges

30—80

msec.

(Effect

2)

Frequency

response

.........

0...

ce

cece

eee

eeneeen

ees

10Hz—35kHz,

+O0dB,

—0.5dB

Harmonic

distortion

.......................ccceeeeeeeeee

eens

Less than

0.01%

(20

Hz—20kHz,

output

1

V)

SIN

AIO

soca

S.

aso.

ce

diecewieda

chases

teadeeth

taeda

as

a

eaaiel

tos

100

dB

(Short-circuited

IHF-A

network)

Maximum

output.............

00.0.

cce

ccs

cce

cece

cease

ee

eeneas

7

V

(1

kHz,

THD

0.01%,

RL47

kQ)

Gai

eso

S

aces

eared

ienashanae

ean

Mean

aa

aac ans

0

dB

Input

impedance.................

06

.ce

cc

cce

cee

eee

eec

eee

eens

47kQ

Output

impedance

.....0...0..

0...

cece

cee

eteeeeneeeee

600Q

Mic

input

sensitivity

................

edhe

atceodeues

Rea

naeees

1

mV

Mic

input

irapedance

............

cee

eeee

reece

eee

36

kQ

Attenuation.

...........0..0.

cece

ce

eeceeeeeeneeneeeeenes

—6dB

at

1

kHz

Input

sensitivity

....0..0.0....

cece

ccc

eee

ee

nee

een eas

150

mV

Power

consumption

.........0.0.....0c

cece

ce

ee

ceeeeee

tees

18W

Dimensions

.............00cccceceeceeesescceeeeeseaeeeneeenes

420(W)

x

57(H)

x

216(D)

mm

(16-17/32”

x

2-13/64”

x

8-1/2”)

Weight

(net)

.................0

ccc

ce

cece cece

cence

ec

eeceeen

es

2.5kg

(5.5

Ib)

Note:

We

follow

a

policy

of

continuous

advancements

in

development.

For

this

reason

specifications

may

be

changed

without

notice.

6

RA-54

(ky

Kenwood RA-54 User manual

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