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. 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
SOURCE/MIC
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,
PHONO, TUNER, CD/AUX or TUNER,
TAPE
2
(to
TAPE
1)
CD/AUX
or
iad
snes
ae
SOURCE/MIC
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
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 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