Shure AVC20 User Manual

Owner's

VIDEO / HI-FI

SYSTEM

EXPANDER

Manual

222 HARTREY AVENUE EVANSTON, ILLINOIS 60202-3696 U.S.A TELEPHONE [phone] CABLE SHUREMICRO

The AVC20 offers the choice of three different types
of surround-sound effects: Dolby Surround, Spatial
Surround, or Concert Surround.
The AVC20 is equipped with Four Power amplifiers.

AVC20 allows central control of most video equip-

The

ment.
4 types of easy to operate volume balance controls.
The

AVC20 is equipped with a sound memory circuit.

The Surround Indicator can be switched on or off.

The

AVC20 can be used as a high output stereo amp-

lifier when in the Balanced Transformerless (BTL) mode.

TABLE

Special features
Surround-sound effects 3

Installing the glass door 3
Locating speakers 4

Connection of speakers 5

Function names and operations - Front panel

Function names and operations - Rear panel.

Volume - Balance control

Use of wireless remote control
Use of the image enhancer switch
Applications 15
Example of use with a variety of different equipment

(Monophonic video deck)
(STEREO video deck)
(Two video decks)
(Video deck and video disc player)
(TV equipped with video input terminal)

(Overall connections)
Cautions on usage 30
Troubleshooting.. 31
Specifications 31

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

OF

CONTENTS

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10
11
14

20
21

22

24

26

28

2

6
8

NOTICE

This equipment generates and uses radio fre.
quency energy and if not installed and
properly, that is, in strict accordance wi
manufacturer's instructions, may cause
ence to radio and television reception. It has

been type tested and found to comply
limits for Class
dance with the specifications in Subpart J of

Part 15 of
provide reasonable protection against such
interference in a residential installation. How­ever, there is no guarantee that interference
will not occur in a
equipment does cause interference to radio or
television reception, which can
by turning the equipment off and on, the user
is encouraged to try to correct the interference
by one or more of the following measures

-

reorient the receiving antenna

-

relocate the equipment with respect to the
receiver

-

move the equipment away from the receiver

-

plug the equipment into a different outlet
so that
ferent branch circuits.

If necessary, the user should consult the dealer
or an experienced
for additional suggestions. The user may find
the following booklet prepared by the Federal
Commuincations Commission helpful:
"How to Identify and Resolve Radio-TV inter­ference Problems"
"This booklet is available frorr the
ment Printing Office. Washington.

Stock No. 004-000-00345-4"

Caution:

this (polarized) plug with an extension cord.

receptacle or other outlet unless the blades can
be fully inserted to prevent blade exposure.

Attention:

pas utiliser cette fiche polaris6e avec un prolon­gateur, une prise de courant ou une autre sortie
de courant,

a

fond sans en laisser aucune partie a dbcouven.

€4

computing device in jr.

FCC

Rules, which are designed to

particular installation. If this

be

determined

ecluipment and receiver are on dif-

radioltelevision technician

US

D.C.,

To prevent electric shock do not use

Pour prBvenir les chocs Blectriques ne

sauf si les lames peuvent Btre ins6rBes

interler-

\n

Govern-

'

1

'je

',

WARNING: TO PREVENT

RISK

OF

ELECTRIC SHOCK

Amn

Caution: To reduce the risk of electric
shock, do not remove cover (or back).
No user serviceable parts inside.

Refer servicing to qualified service

personnel.

m

THIS APPLIANCE TO RAIN OR MOISTURE

FIRE OR SHOCK HAZARD,

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
sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle
alert the user to the presence of important operating and maintenance

(servicing) instructions in the literature accompanying the

DO

NOT EXPOSE

is

intended to

be

of

applianw

SURROUND-SOUND

EFFECTS

Surround-sound

AVC20 is equipped with three types of surround

The

a

processors which provide
sion.

4

Every day, we are exposed to sounds coming from our

)

surroundings. Some sounds reach our ears directly from
the source, some indirectly reflected off of walls or the
ceiling. Sounds of voices reach us from behind, sounds
of cars reach us from the side.
around us are called "surround-sounds".

In order to recreate with as much precision as possible,
that special sound heard in movie theaters, speakers are
placed both in front of and behind the listeners. The

reason that sound from the television in our homes

different from the sound in movie theaters is because

sound from a television only comes from in front of

the viewer. With a surround system, the spatial infor-

mation encoded in a film's sound track will be repro-

duced in the home listening area.
The sound from a TV equipped with a single speaker (or
two speakers with stereo televisions) sounds very dif­ferent from the actual, "live" sound.

The AVC20 is equipped with three types of surround
processors to recreate that sense of presence and let you
enjoy surround-sound in the privacy of your own home.

sense of presence and expan-

Sounds coming from all

is

Surround Processors

=

DOLBY SURROUND*

Provides the optimal sound when watching recent movies,
especially those encoded with the DOLBY SURROUND
or DOLBY STEREO process. The front speakers provide
the normal stereo effect, while the rear speakers reproduce

the surround signals. This position provides excellent

results when watching television programs, video soft­ware, video discs, or videotapes of stereo television broad-

casts.

CONCERT SURROUND

so

This provides the best results when watching old movies
or video recordings of concerts. The front speakers provide
the normal stereo effect, while the rear speakers provide

reverberation like that heard in concert halls. The reverbe-

ration time can be adjusted using the CONCERT

SURROUND Control.

SPATIAL SURROUND
Use this when watching live sports games to reproduce that
stadium feeling.

*Manufactured under license from Dolby Laboratories Licensing

Corporation. Additionally licensed under one or more of the
following patents:
3,959,590; Canada numbers 1.004.603 and 1.037.877 "Dolb~"
and the double-D symbol are trademarks of Dolby Laborator~es

L~cens~ng Corporat~on.

U.S.

numbers 3,632,886, 3,746,792, ar~d

S STALLING

THE

GLASS

DOOR

LOCATING

Speaker location will depend in each case on the size and
shape of the specific room in which the Home Theater
System is installed. The diagrams below may be used as a
general guide to speaker placement in rooms of various
shapes. To avoid interference with the tv picture, speakers
without special magnetic shielding should ordinarily be

more than

best to consult the tv and loudspeaker manufacturers.

0.6m

(2

SPEAKERS

ft) from the screen. In each case, it is

18).

When a Center speaker is employed (See page
is most conveniently mounted above or below the screen,
but always as close to the screen centerline

Because very low frequencies are nondirectional in
room, a subwoofer (See page
almost anywhere convenient in the room. However, de­pending on room acoustics and the particular subwoofer,
some locations may be clearly superior to others. Consult
the subwoofer manufacturer for specifics.

8)

as

possible.

can usually be loca

it

-

,!

LOCATING SPEAKERS

CONNECTION OF

Connection of 4 Speakers

SPEAKERS

OPERATE SWITCH
Normally this switch is SPEAKER AC OUTLET

Connection of Speaker Cables

1.

If the bare speaker wire is too short, strip off

the vinyl and make the exposed wires the

same length.

lomm

I

[318'n1

I

(SWITCHED)

16

ohms.

There

+I

MONO OUT

Monophonic Output kept to the left (seen OUTPUT
Terminals from behind). TERMINALS

is

one set of four speaker output terminals. Use speakers with an impedance of 8 to

Normal

Speaker

Connection

*F

EXAMPLE:

bottom side.

2.

Press down the lever and insert the cord. Use a

"+"

terminal for the + side of the speaker and

a

"-"

Remove your finger from the lever, and pull

it

is

on the cord to be sure that
nected. Be sure that the wire does not stick out
Put the Operation Switch in the
position.

properly con-

I

NORMAL

3.

1

terminal for the - side.

Raise the lever.

from the cord and come into contact with
wire of another cord,
equipment.

With a speaker terminal on the

as this may damage the

FUNCTION NAMES AND OPERATIONS-FRONT PANEL

Function Names and Operations

@

@

Power Switch (POWER)
Use this switch to turn the power of the

on and off. After turning on, allow approximately

4

seconds to pass before using. During this time,
the FULL MUTE indicator on the concen­trated indicator panel will flash, indicating that the
set is in the stand-by mode.

@

Concentrated Indicator Panel

lndicators light up according to the operations
performed on the

@

SURROUND INDICATOR

Three red
the level at the

Front Left Channel Front

AVC2O.

LEDs are displayed, depending on

AVMO speaker outputs.

Right

Channel

AVC20

REMOTE SENSOR
This is the window used for receiving the signal

from the supplied wireless remote control unit.

BYPASS

Use this position when you wish to
obtain stereo sound without any
surround effect.
Sound is produced only from the two

front speakers.

@

SYNTHETIC STEREO

Use this switch to obtain simulated

stereo sound from monophonic signals.
Use the SYNTHETIC STEREO vol-

ume control located inside the control

panel door to adjust the stereo effect.

Rear

Rear

Left Channel

@

Volume and Balance Controls

(For

details,

refer

to

page

10)

@

Input Selector Switches and lndicators
(AUDIOIVIDEO SELECTOR)

Use these switches to select the program source.
When the

sound source
connected to the TAPE input terminals while
the video source
whose selector switch

(For details, refer to page

WE]

switch

..

is

switched to the component

is

provided by the A-V INPUT

is

pressed.

Right Channel

is

18)

pressed, the

This function can also be used to expand a
stereo source.

@

CONCERT

SURROUND

@

SPATIAL
SURROUND

I

This

is

the best position for viewing

televised concerts or old movies.

Use the CONCERT SURROUND
volume control located inside the
trol panel door to adjust the

time.

This

is

the best position for viewing

sports or music programs.

con-

reverbera-

DOLBY
SURROUND

mark
STEREO

The Dolby Surround system
licence from Dolby Laboratories Licencing Corporation.
Refer to page 3 for more detailed information.

@

Surround Indicator Switch

(SURROUND INDICATOR)

Use this switch to turn the SURROUND
INDICATOR on or off.

Press once to turn the SURROUND INDICA­TOR off if

@

NOISE Filter Switch (NOISE FILTER)

1

MONO INPUT

Depress when using a monophonic video deck.
The STEREO indicator will turn off.

@

FULL MUTE

Depress to cut off sound momentarily.
When dep~essed, the indicator will light.

Press again to return to the original volume.

@

Volume Reset Switch (VOLUME RESET)

Use this to make the volume from each speaker
equal.

As the volume will be low when this is done,
use the volume switches
balance.

@

Image Enhancer Switch (IMAGE ENHANCER)

Use this switch to make the contours of the
picture clearer.

0

3dB

0

6dB

0

OFF

*

As the image enhancer makes all details of the
picture clearer, small white spots on the screen
may also stand out, thus making the picture
actually harder to see. If this is the case, turn
the function OFF.

This

is

movies.

0

The AVC20 is equipped with the
proper Dolby Surround decoder for
use especially with video software con­taining the DOLBY SURROUND

00

,,,,,,~

,,~,,,,,,

rnark~OImre*m~mI'"appears

This filter reduces the hissing noise
produced when viewing old movies for
example.

the best position for viewing

,,(

'"

or movies in which the DOLBY

is

manufactured under

it

is

distracting.

@

to readjust the

at the end.

@$

Synthetic Stereo Control (SYNTHETIC STEREO)

Use this control to adjust the effect when the
SYNTHETIC STEREO switch
Expansion becomes greater when turned clock­wise, and lower when turned counterclock­wise.

@

Concert Surround Control (CONCERT SURROUND)

Use this control to adjust the effect when the

CONCERT SURROUND button
The reverberation time is increased when
turned clockwise.

@

Input Balance Control (INPUT BALANCE)

Use this to balance the left and right channels
of the input source.

@

INPUT VOLUME

Use this control to set the maximum volume.

(Refer to page

@

Tone Control
Treble and bass tones can be controlled for both
the front and rear speakers.

Use the FRONT control to adjust the tone of
the front speakers, and the REAR control for
the rear speakers.

Use the TREBLE and BASS controls to adjust
treble or bass.

Turn clockwise to increase the effect, or count­erclockwise to decrease.

10

for details.)

@

@

is

turned on.

is

depressed.

FUNCTION NAMES AND OPERATIONS-REAR PANEL

Function Names and Operations

@

A-V INPUT 1 Input/Output Terminals

@

A-V INPUT 2 InputIOutput Terminals

@

A-V INPUT
are used for connection of components on which
recording is possible, such

@

A-V INPUT 3 lnput Terminals
A-V

INPUT@

nection of components for which only playback
is

possible, such as video disc players compact disc

players, or television tuners.

@

PHONO lnput Terminals
PHONO lnput Terminals are used for connection
of a Phono Turntable without preamp.

NOTE: Selected input signals (including PHONO

and TAPE) appear at output jacks of A-V INPUT

1,

A-V INPUT 2 and TAPE.

0

Monitor Output Terminals (MONITOR OUT)

These are used for connection to video input
terminals of color
equipped with video input terminals.
There are two independent output terminals,
making possible the connection to two com­ponents.

@

Tape Input/Output Terminals (TAPE INIOUT)

Connect an audio cassette deck or the like to
these terminals.

(For details, refer to page

and @ Input/Output Terminals

as

a

video deck.

lnput Terminals are used for con-

monito,rs or televisions

18)

@

These are front speaker preamplifier output and
main amplifier input terminals.

@

These are rear speaker preamplifier output and

main amplifier input terminals.

Use these for connection of an equalizer or

signal processor or of a pre-amplifier or main

is

18).

AVC20.

@,)

is a mixture

high, the

amplifier other than those of the

Usually, use the AVC20 with the pre-amplifier
output terminals connected to the main

amplifier input terminals with the supplied
shaped connecting pin.
The AVC20 can also be used in the BTL mode
or

as

a

surround processor. For details, refer to

15

and

Pages

@

Monophonic output Terminal
MONO OUT A,

Use these outputs for connection to a Sub­woofer or center channel amplifier and speaker

(A

sub-woofer will transduce only low-frequ-

ency signals, a full-range speaker will handle the

complete audio spectrum.)
The output level

input. Match with the input sensitivity of the

speaker or other component to be connected.

The output signal of terminals
of the front left and right channels. When the

volume of the front speakers
output level also increases. This can be used as a
center channel output.

(For details, refer to page

17.

B

is

approximately 1 V

at

a rated

MONO

U-

@

Operation Selector Switch

Use this switch to select NORMAL or Balanced

Transformerless

(BTL) operation.

NORMAL Operation

0

Use this position for independent operation
of the four power amplifiers.

0

This is the position in which the AVC20
normall y used.

0

In this position, the AVC20's output is
30W x

4.

BTL Operation

0

Use this position to use the AVC20 as a

stereo amplifier, with the four power ampli-

fiers combined in groups of two.

0

In this position, the AVC20's output is 60W

x 2.

CAUTION
TURN OFF
OPERATING

(For details, refer to page

@

Speaker Connection Terminals

AVC2O

THIS SWITCH.

POWER BEFORE

15)

Use these to connect speakers.

(Refer to page 5 for details.)

is

@

Power Cord
Plug this into an ac wall outlet. 120

@

Supplementary Power Outlets (AC OUTLETS)

Vac 60Hz.

SWITCHED

This outlet operates only when the AVC20
power is on.

Use this outlet to plug in equipment with a

maximum power consumption of

100W.

Use this outlet for example for a self-powered

subwoofer.

@

Supplementary Power Outlets (AC OUTLETS)

UNSWITCHED
These outlets can be used regardless of whether
the

AVC20 power is on or not.

Use these outlets to plug in equipment with

maximum power consumption of 100W.

WARNING

Power Consumption of Outlets

Never use the AC OUTLETS with equipment

which consumes more power than is indicated

on the panel (for example, toasters or hair
dryers). This could damage the equipment or
result in a fire.

a

VOLUME-BALANCE CONTROL

The AVC20 is equipped with 4 built-in power amplifiers. The volume of each of these can be controlled separately.

Volume Control

m

IvoLuME

Balance Control

Press the upper side
Press the lower side

Volume increases faster than

to simultaneously increase the volume of all four speakers.

to simultaneously decrease the volume of all four speakers.

it

decreases.

lncreases the volume of the front left speaker.

FL:
FR: lncreases the volume of the front right speaker.

RL: lncreases the volume of the rear left speaker.
RR:

Increases the volume of the rear right speaker.
FRONT: Causes the surround image to slowly travel towards the front.
REAR: Causes the surround image to slowly travel towards the rear.
LEFT:
RIGHT:

Causes the surround image to slowly travel towards the left.
Causes the surround image to slowly travel towards the right.

RL

FR

,,

lnput Volume

The lnput Volume control located behind the control
panel door is used to
that the volume of none of the speakers exceeds

certain level.

set

the maximum volume

When the volume of one of the four speakers reaches
the maximum level, the indicator flashes. When
the volume of one of the four speakers reaches the

minimum level, the indicator flashes.

Adjusting the lnput Volume

@

so

a

This mark lights.

First set the INPUT VOLUME control to the mini­mum. (Number @ inside the control panel door)

@

Use the Volume up control and set the AVC20
volume to the maximum (the
flash), then bring

(Press the Volume down

@

Next gradually increase the lnput Volume until a
comfortable listening level is reached.

This is described by the following diagram.

w

+-------

LIMIT

it

down 5 steps.

button

Greatest volume which

can be produced by

AVCZO

the

Greatest volume set by
the INPUT
control.

VOLUME

If_l

indicator will

5

short times)

Volume you most frequently use.

+.-

.fin

LOWER

This mark lights.

Dolby Surround and lnput Volume
The output level on some

this is the case, DOLBY SURROUND sound may be distorted. Should this happen, lower
the INPUT VOLUME. INPUT

VHD video disc players or laser disc players is quite high. When

-

k4i.i-m volume
no sound is produced.

-

VOLUME

USE

A variety of operations are possible from a comfortable distance when, using the wireless remote
control unit.

Remote Control Sensor

.When using the wireless remote control,

always point it toward the remote control
sensor on the
This wireless remote control unit uses infrared

rays. Exposure of the sensor on the
to strong fluorescent light or the like could
result in malfunction. Locate the
to minimize exposure to surrounding light.

.The wireless remote control unit should

used within vertical or horizontal angles of
approximately

on the

OF

AVC20 at a distance up to 7m (20ft).

WIRELESS

AVC20.

AVC20

AVC20

30'

with respect to the sensor 600 meters

REMOTE CONTROL

I

be

'

A~~~~~.

A~~~~~,

\

I

Remove the cover on the rear.

CAUTIONS ON BATTERIES

a

Use size "AA" batteries.

Replace the batteries when distance of ope­ration decreases.
The replacement interval depends on the
number of times used, but it
ed that the batteries be replaced at least
once every year.
When not using the remote control unit for
an extended period of time, remove the
batteries.

Do not use an old battery with a new one or
two batteries of different types (for example,

Insert two size "AA" batteries, pay close

attention to the correct polarity

is

recommend-

INSERTING BATTERIES

one dry cell and one alkaline battery), as this
may result in leakage or damage to the unit.
Should leakage occur, wipe thoroughly and
insert new batteries.
Do not short circuit, disassemble, or throw
batteries into flames.
Do not place objects on top of the remote
control unit, as the batteries will wear out if
a

key

is

Always strictly observe cautions written on
batteries.

Do not dispose of batteries together with
flammable garbage (where applicable).

I+

and

-1.

held down.

'0

Replace the cover.

1.

SURROUND-SOUND EFFECT SELECTION

The

AVC20 provides a choice of 3 surround effects,

depending upon the program or software being viewed.

For programs for which the surround effect
ssary, such as news broadcasts, press the BYPASS but-

ton. Sound can be heard from the front speakers only.

-1-

1-1-

m

JCONCERTI-

*Refer to page 3 for more detailed information.

2.

Use

of

Volume Button

First press the RESET button (there
pressed down), then press the side of the VOLUME
button. When held down, the volume gradually increases. If
the volume becomes too loud, press the
desired volume is reached, release the button.

Press this button for movies, etc.

Press this button for sports programs etc.

Press this button for concerts or old movies.

is

no need to keep it

mside. When the

is

not nece-

3.

Adjusting Volume Balance

From the listening position, adjust the volume balance,
using the controls described below, to feel engulfed from all
sides while maintaining a good front stage orientation.

Readjust the overall volume.

I=].

-1

.

.

.

.

. . . . .

. . . . . .

. .

. . .

.

.Causes the surround image to slowly

travel towards the front.

.

.Causes the surround image to slowly

travel towards the rear.

.Causes the surround image to slowly

travel towards the left.

.

.Causes the surround image to slowly

travel towards the right.

4.

Use of the Preset Volume Buttons

A

volume adjustment setting will remain stored in

the memory for approximately one week after the

power
To change a preset volume adjustment setting,
adjust the volume

procedure

in the memory will be erased.
The preset volume adjustment setting can only be

obtained by using the remote control unit.

It

is possible to place in the memory three different volume
adjustment settings. When the optimal adjustment is reach­ed

as

shown in number 3 above, press the STORE button.

(There

done, the PRESET VOLUME indicators

(

flashing (approximately

SET VOLUME buttons on the wireless remote control unit.
The volume adjustment

Simply press the desired button to obtain the preset volume
adjustment later on.

is

turned off.

as

desired, and follow the same

as

in step 4 above. The previous setting

is no need to keep

)on the

AVC20

it

pressed in.) When this

(

,

I,

will flash. While the indicators are

5

seconds), press one of the PRE-

is

now stored in the memory.

A

and

is

5.

Use of Full Mute Button

Press this button when you wish to turn off the volume
momentarily, such as when
or when the telephone rings. The FULL MUTE indicator

Won the

again to return to the previous volume.

AVC20

a

visitor arrives unexpectedly

will flash. Press the button once

USE

OF

THE IMAGE ENHANCER SWITCH

Use of the

The lrnage Enhancer function
cleaning up fuzzy pictures, or when watching
foreign films, making movie subtitles clearer.
The switch works in three steps:

0

3

0

6

0

OFF.
When watching old movies or video software and
white shimmering appears on the screen, using the

lrnage Enhancer Switch to clear this up may make
the screen hard to
the picture

IMAGE ENHANCER

dB (decibels) For lesser effect.
dB (decibels) For greater effect.

..........

.........

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

see.

Use the switch only when

is

improved.

Switch

is

very effective for

Switch

is

tuned off.

APPLICATIONS

(1)

Balanced Transformerless (BTL) Mode

The AVC20 has a built-in 4-way 30W amplifier system,

it

but by switching to BTL operation,
2-way 6oW amplifier system.

.

. .

BTL

Switching

TURN OFF

I

BTLSWITCH.

Balanced Transformerless

CAUTION

AVCZO POWER BEFORE OPERATING

can be used as

I

Adding Amplifiers in the
Adding amplifiers while in the BTL mode makes possible
the creation of a sound system with total output greater

a

than 120 watts.

Only use this switch when the power is off.

Set the NORMALIBTL switch to the BTL side.

Connect the speakers as shown in the diagram.

Sound is produced from the outside speaker terminals
when using the
speaker terminals become BTL

Connection

@

To use the AVC20 on the two front channels and use

the two rear channels with other amplifiers, remove the

U-shaped short pins

(In order not to lose the pins, use cellophane adhesive
tape or the like to fix them to the rear panel.)

@

Connect the REAR- PRE OUT terminals to the AUX
IN terminals of the added stereo amplifier using pin
plug cables.

@

When this is done, the AVC20 volume control can be
operated, but the volume of the other amplifier must be

increased to match that of the

AVC20 in the BTL mode. (The rear

(A)

BTL

Mode

'I-"

speaker terminals.)

as

shown in the diagram.

AVC20.

"+"

Connection

To use the AVC20 on the two rear channels and use the

@

two front channels with an added amplifier, change the
U-shaped short pins as shown in the diagram.

@

Connect the FRONT-PRE OUT terminals to the input

terminals of the other amplifier using pin plug cables.

@

Use the outside speaker terminals for the Rear speakers.

@

When this
operated, but the volume of the other amplifier must

increased to a suitable level.

(6)

is

done, the AVC20 volume control can be

be

I I

Remove both the FRONT and
REAR short pins, and as shown

in the diagram, connect the

FRONT

PRE OUT terminals.

MAIN IN and REAR

-SPEAKER

Right Channel Left Channel

Rear Speakers

Other Amplifier

SYSTEMS-

El

Right Channel Left Channel

Front Speakers

(2)

Using as Surround Processor

The AVC20 can be used by disconnecting both the front

and rear pre-amplifiers and main amplifiers.

To use the

AVC20 as a surround processor with different
main amplifiers, remove the four short pins as shown in the
diagram, and use pin cords to connect the

PRE

OUT termi-

nals to the input terminals of the other amplifiers.

When this

is

done, the AVC20 volume control can be ope­rated, but the volume of the other amplifiers must be
increased to a suitable level. The

AVC20 amplifiers can also
be used by connecting Aux level outputs of audio devices
to the

MAIN inputs.

SPEAKER SYSTEMS-

Connect the AVC20

PRE

OUT terminals to the input
terminals of the other amplifiers using cables with phono
plugs at the

AVC20 side and appropriate connectors

at

the

amplifier side.

Center

Arnpl~f

ier

SPEAKER

Center Speaker

Center Speaker

(3)

MONO OUT

Many audio/video systems are
centered between two speakers. Sometimes, however,
if the speakers are located far away from the tele­vision, the resultant center localization can become
confusing.
To provide better center localization, connect one of
the

AVC20's mono outputs to an external amplifier
and speaker, placing the speaker under, or as close
as possible to, the television.

Use a shielded magnet type speaker as the center
speaker, and keep as close
screen for best results.
When using a monophonic main amplifier
ter channel, use the
for best results.

(4)

Use

of

It

is possible to add a different audio source to video
software.
using a different audio source.
Connect as shown in the diagram.

@

Connect a playback video component (for example, a
video disc player) to the A-V INPUT
nals and depress the A-V INPUT

front panel.

Connect an audio component, such as a compact disc
player or cassette deck to the
nals.
When the selector button of the front panel
is

depressed, the image from the video component
connected to
of the component connected to the
nals is produced from the speakers. The audio signal
from the TAPE input overrides the audio signal from
AV INPUTS

This can be recorded on to a video deck connected
to the output of either A-V INPUT

Input/Output Terminals

It

is also possible to dub onto a video deck

AVC20's MONO output terminal

1

appears on the monitor. The sound

1.2, and

3.

set

up with a television

as

possible to the monitor

-

3

m]

1

as

the cen-

1

3

Input termi-

button on the

input termi-

ml

or 2.

termi-

With Input on the Left Channel
The left speaker output produces
sound.

(5)

Use

of

These can be used

signal processor such as

Connect as shown in the diagram.

Depress one of the A-V INPUT
choose which component is to be played back, and
then depress the button.

Control by the signal processor is possible.

Refer to the signal processor instruction manual

for details on

Input/Output Terminals

as

input/output terminals for a

a

graphic equalizer.

its

use.

-

1-3

2

or PHONO to

(4)

Connections for "Use of

WI

Input/Output Terminals - Example

1"

Color Monitor

AVCZO Connections

Video Deck IHiFil

m Audio Output Terminal

From Video

Output To Video Input Terminal

AVCZO

-

To Audio lnput Terminal

Video Disc Player (etc.)

Lm/

I

From Monitor Output Terminal

Audio Component
(Compact Disc Player,
Cassette Deck,

(5)

Connections for "Use of

etc.)

(TAPEl

To Tape Input Terminal

InputIOutput Terminals - Example

AVC20 Rear Panel

71

Graphic Equalizer
(Rear Panel)

I

To Tape lnput Terminal

.b

From Tape Output Terminal

-

2"

Front Panel

EXAMPLES

OF

USE WITH

DIFFERENT EQUIPMENT

(Monophonic Video Deck)

As shown in the diagrams below, video signals are supplied to the television through the antenna

Antenna

line, and audio signals pass through the
the TV Volume whenever the

---*

Audio Signals

Connection to AVC2O

AVC20 amps are used.

Pin Jack Cord

AVC20 to produce sound from the speakers. Turn down

Antenna Line

A

VARIETY

OF

UHF

Antenna VHF Antenna

Regular
Video
Deck

Set the AVC20 AUDIOIVIDEO
SELECTOR to A-V INPUT

Set front panel switch to MONO or
SYNTHETIC STEREO. Choose the
one that sounds best to you.

Operate the video deck.

m

For operation of the video deck, refer

to its instruction manual.

1.

-

Television

Cable

MONITOR OUT

PHONO

A-V

INPUT

1

INPUT^

INPUTS

EXAMPLES OF

USE

WITH

DIFFERENT EQUIPMENT

A

VARIETY OF

(Stereo Video

USE OF INPUT SELECTOR SWITCHES

VHF

r

Deck)

Antenna

UHF Antenna

I

SOURCE SELECTOR SWITCH DISPLAY
Mono MONO Off

Mono SYNTHETIC STEREO
Stereo BYPASS
Stereo CONCERT SURROUND

Stereo SPATIAL SURROUND

stereo

Television

pxial

DOLBY

--

SURROUND

1

Cable

I

I

I

J

[m

r

.

-

g..l

-_I

-

-

-

3

7-

HiFi Video Deck

Set the AVC20 AUDIOIVIDEO SELEC­TOR to A-V INPUT

-

I

I

m

Set the selector switch for the format
that best suits the material according to
your personal preference.

Operate the video dec~.

For operation of the video deck, refer to

its

instruction manual.

For antenna connection, refer to the

video deck instruction manual.

In this example, the video signals do not
pass through the
enhancer function

1.

AVC20, so the image

is

inoperable.

EXAMPLES

OF

USE

WITH

A

VARIETY OF DIFFERENT EQUIPMENT

(Two Video Decks)

First, decide which deck is to be used primarily. In the axample below, a stereo video deck is used as
the primary deck, while a monophonic video deck
video deck's video signals pass through the
deck, whose VHF output terminal is connected to the telesvision.

AVC20 into the LINE input terminal of the stereo video

is

Uxed as the secondary deck. The monophonic

a

Operation of the

When playing back on the Stereo video deck.
should be chosen be instead, in the BYPASS depending position on personal (the prefereqce. indi%ator lights). Any of the Surround switches may

AVC20

the

3~~20's STEREO INPUT SELECTOR Switch

-+

Video Signals

-

-,

Audio Signals

Vidteo Deck

AVC-20

--

i

.

L--

---.--.------

Video Deck 1 (Stereo)

B

For playback on the monophonic video deck:

1

Place Stereo video deck's input selector switfCh

2

Set the Stereo video deck's VIDEO/TV sel?ector switch to

3

Press the AVC20's MONO INPUTswitch '(the

4

Set the AVC20's AUDIOIVIDEO SELE-~TOR Switch to A-v

5

Start playback on the monophonic vidfeo deck.

The Stereo video deck can be used-for rrecording while the monophonic video deck

back.

The Monophonic

back. (Press A-V

For instructions on playback and recording on the video decks, refer to their instruction manuals.

TV-

ST:

rLlNE

video deck can be bsed for recording while the Stereo video deck

INPUT

1

.)

Set to "LINE,,

Video

Deck

(For Playback Only) Monophonic

to

LINE,

VIDEO.

indicator will remain off).

INPUT

2.

is

being played

is

being played

2

A

11

1111

-SEIKLASYSTEMS-

From Video Output Termirtal

To Video lriput Terminal

From Audio Output Terminal

To Audio Input Terminal

AC

OUTLETS-

L

L

I

I 1 I

]

EXAMPLES

OF

USE WITH

A

VARIETY OF

DIFFERENT EQUIPMENT

(Video Deck and Video Disc Player)

The video disc player's video signals entering the AVC20, are sent from the AVC20 output terminals
to the video deck's
sion.

Video Disc

,,,,..c-d7fq

-

Video Signals

-

+

Audio Signals

LINE input terminals, and then from the video deck's VHF terminal to the televi-

Line

-

-

a

AVC20 Connections

Video Deck

I

I

-

- - - - - - - - - - - - - - - - -

.

- - -

Antenna

u

Operation of Video

Operation of

AVC2O

Deck

1

(HiFi)

T\I~

SO

dLINE

3

2

Set the VIDEO/TV Selector

VHF Antenna UHF Antenna

Color Television

1

When playing back on the video disc player, press A-V INPUT 3 button.

2

The video deck can be used for recording while playing back the video disc player.

3

To play back a recorded video tape, press the A-V INPUT 1 button.

its

For instructions on playback or recording on the video deck, refer to

Video

Disc

Player

instruction manual.

(MU

,om,

,MU

lmwl

SWITCHED UNSWITCHED

,MU

,Om8

EXAMPLES

OF

USE WITH

A

VARIETY

DIFFERENT EQUIPMENT

(TV Equipped with Video lnput Terminal)

OF

This combination brings out the best in the AVC20. Output from
to the AVC20, the video signals are sent from the Monitor Output Terminal to the television's Video
lnput Terminal, and the audio signals are sent to the speakers.

To Video lnput Terminal

Monitor

Output

Equipment

AVCZO

Connections

For connection of antennas, refer to page

20

or the video deck's instruction manual.

all

audiolvideo equipment

TV with Video lnput Terminal

is

input

Video Signal
Audio Signal

When using a television equipped with

input terminal, set the VIDEOITV Selector

Switch to VIDEO.

i

Color Monitor,

TV

with Video lnput Terminal, etc.

a

video

I

I

Video

Deck

(HiFi)

Video Disc Player, etc.

L

EXAMPLES OF

USE

WITH

DIFFERENT EQUIPMENT

A

VARIETY OF

(Overall

Connections)

Connect equipment for playback and recording, such
as a video deck, as below for best results.

Connect
tun(( video disc kplayer, here for best results.

equipemrnt for playback only, such

EX:

Video

Disc

as

Player

a

TV

Color Monitor or
TV with Video
Input Terminal

Color Monitor

Speaker

1

Refer to page

18.

Center Channel

Arnplif ler

To AC outlet

o

o

1

ACl20V. 60Hz

For speaker connection, refer to
For use with

BTL

operation, refer

page

to page

5.

J

Plug the self-powered Subwoofer into the AVC2O
SWITCHED AC OUTLET.

CAUTIONS ON USAGE

For

Safety

Power Source

Connect to a household power ac outlet.

Take

Care

Wllen Installing

Do

not use the AVC2O in such places as follows:

cold

I4O0F1

places

)

(~~l~~ 5Oc

/.

Places in which vibrations

,

are strong

Power Cord

Do not bend or twist the power cord or place heavy objects on top

it.

A damaged cord may result in fire or electric shock.

of

Do Not Open
Do not remove the
damage the
service personnel.

When Not At Home
When not using the AVC20 for an extended period of time, such as

when traveling, be sure to unplug the

Problems
Should any irregular noise, smell, or smoke be discovered, turn off

the power switch, unplug, and contact your dealer or qualified
service personnel.

cab~net, as this is both dangerous and could

AVCZO. Leave inspection and service to authorized

......

AVC20 from the power

Hot

places

(above

400C

[105OF]) or in direct

Wet or humid places

Places in which dust. grease
or smoke are present.

I

/

Place in which magnetic
force is generated

Places in which ventilation

Unstable places. (Avoid
plac~ng on unsteady stands)

Handling

Do not block the ventilation openings.
Ventilation openings in the cabinet are designed to prevent over­heating of internal parts. Do not place a tablecloth or cover on
top of the AVC20, or place the AVC20 on a blanket.
Do not place against a wall.

Keep at a distance of at least 10 cm
Do not place heavy objects on top of the AVC2O.
For transporting and storage,
Avoid excessive shocks. When moving, turn the power switch off.

14

in.) from the wall.

Normal Care

Cleaning the Cabinet

.To clean the cabinet and front panel, wipe gently with a soft

cloth (flannel for example). For tough dirt, apply medium strength
detergent diluted in water to a a soft cloth, wring out thoroughly,
wipe off dirt, then wipe with a dry cloth.

If

the surface of the cabinet comes in contact with a volatile

substance such as benztne, thinner, or insecticide, or if wiped with
a chemical rag or the like,
peel off

it

could be damaged, or the paint could

Symptom

=

Power does not come

on

Cause

a Power plug is not connected properly to an ac outlet.

l

Power switch is off.

l

Plug in firmly.

l

Press power switch on.

Measures

1

No sound or picture

is produced

No sound is produced

No SURROUND is
produced

After a power outage, operation of

a Connection cords are disconnected.
a Connection cords are connected improperly.
a The position of the input selector switch does

not match the input of the component being
used.

a The input selector switch

on.

The FULL MUTE switch is on.

flashes)

a Balance adjustment is incorrect.

l

The BYPASS button has been depressed.

the

A

VC20

SPECIFICATIONS

Amplifier Section
Rated Output (all channels driven, Main Amplifier Input)

In Normal Operation

In BTL Operation

Harmonic Distortion

In Normal Operation (at rated output)

Frequency Response

(Main Amplifier Input)
Tone Control

SN Ratio (IHF shortcircuit,"A" network)

AudiolVideo Input (BY PASS)

Main Amplifier Input

Input/Output Section
lnput Terminal (Sensitivity, lnput Impedance)

A-V INPUT

PHONO
TAPE

Main Amplifier

Output Terminals (Output Level. Output Impedance)

AudioIVideo

AudioIVideo

Monitor Output

Pre-Amplifier Output

Monophonic Output A, B

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

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

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

........

......

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

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

O,

IZj,

B

.....

Input

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

m,

........

W,

[Z1

........

(1, 2)

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

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

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

Front

.....

(20 - 20 kHz 8 Ohm)

......

Rear 30W + 30W

60W + 60W (20 - 20 kHz 8 Ohm)

(20

-

20

30W + 30W

kHz 8 Ohm)

..........

lOHz - 40kHz (+O, -2dB)

BASS

........

TREBLE

......

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

....

Video lVpp175 Ohm
Audio

.

.

150mVl47k Ohm

8mV/47k Ohm

150mVl47k Ohm

1Vl20k Ohm

Video

....

Audio . 150mV12.2k Ohm

1 Vpp175 Ohm

1 VppI75 Ohm

1 Vll k Ohm

1 Vl500 Ohm

1-

(

may

be irregular. Turn

<0.1%

AlOdB
*lodB

90dB

lOOdB

a Connect firmly in the socket.
a Check the connections.

l

Change the switch to match the input.

button is

indicator

Others
Power source Voltage

Power Consumption 300W

Supplementary Power Source Outlets

a Press the

.Press the FULL MUTE switch to turn off.

a Press the RESET button, then adjust the volume.

*Depress one of the CONCERT, SPATIAL, or

DOLBY switches.

l

the

power off for a moment, then turn back on.

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

Outer Dimensions

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

Weight

Accessories

Owner's Manual
Wireless Remote Control Unit 1
AA Batteries (SUMS)
Pin Plug Cord for Video Signals
Glass Door
Rubber Bushing
Screw

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

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

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

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

PTA~Eswitch to turn off.

For monophonic audio input, when the MODE
switch is set to MONO, sound is very weak
when in the DOLBY position.

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

120 Vac. 60Hz

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

.....

(W

x

H x D)

.........

(16-15116 x 4-5/16 x 13-318 in.)

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

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

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

Switched: 1 (100W)

Unswitched : 2 (100W x 2)

430 x 110 x 340 mm

9.5 kg

(20 Ib. 14

.....

:

02:)

1

2

2
1
2
2

l

The above specifications are subject to change without notice.