Shure AVC20 User Manual
Owner's
VIDEO / HI-FI
SYSTEM
EXPANDER
Manual
222 HARTREY AVENUE EVANSTON, ILLINOIS 60202-3696 U.S.A TELEPHONE (312) 866-2200 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
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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
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