Marantz 4100 - Vari-Matrix Position; SQ Decoder Position; Pre-Amplifier; Balance Control

stereophonic
signals to
each
channel.
At
this
position,
for
ordinary
stereo
input
signals,
neither
LR
nor
RR
channels
no
signal
to
carry.
In
the
VARI-MATRIX
position,
2-channel
stereo
input
signals
are
converted
into
quadra-
phonic
signals
through
the
vari-matrix
circuit;
the
input
right
and
left
channel
signals
are
fed
directly
to
the
LF
and
RF
channels,
while
the
signals
to
the
LR
and
RR
channels
are
synthesized
from
the
2-channel
input
signals
under
the
control
of
the
DIMENSION
control.
The
LR
and
RR
channel
signal
components
are
controlled
by
the
DIMENSION
control
as
shown
below.
DIMENSION control setting
Bottom
Center
Top
LR output RR output
RF+LF
When
the
DIMENSION
control
is
set
at
the
bottom
the
LR
and
RR
channel
signals
become
monaural,
at
the
center
are
stereophonic,
and
at
the
top
are
out
of
phase,
thus
providing
vanished
sound
image
positioning.
In
the
SQ
DECODER
position,
‘compatible
stereo-quadraphonic
(SQ)
record’’
developed
by
CBS
is
ideally
decoded
into
4-channel
signals.
This
requires
incorporation
of
the
adapter,
Model
SQA-1,
into
the
set.
When
the
TAPE
MONITOR
switch
is
set
to
the
ON
position,
signals
from
the
TAPE
OUT
terminals
are
in
discrete
mode
regardless
of
the
MODE
switch
setting.
In
the
OFF
position,
the
signals
are
processed
into
the
mode
indicated
by
the
MODE
switch
in
the
MONO,
2
CH,
or
DISCRETE
position
of
the
MODE
switch,
while
signals
remain
in
discrete
mode
in
the
VARI-
MATRIX
and
SOQ
DECODER
positions.
4. PRE-AMPLIFIER
Mode
processed
signals
are
led
through
the
respective
VOLUME
controls
to
the
tone
control
circuits.
Hi
and
low
frequency
response
can
be
varied
with
the
BASS
and
TREBLE
controls.
These
controls
permit
separate
adjustment
of
front
stereo
pair
of
channels
(LF,
R
F)
and
rear
stereo
pair
of
channels
(LR,
RR).
5. BALANCE CONTROL
Signals
passed
through
the
tone
controls
go
into
the
balance
control
circuit,
in
which
the
signals
are
controlled
by
three
balancers:
the
FRONT
L-R,
REAR
L-R,
and
FRONT-REAR.
By
setting
the
FRONT-REAR
balancer
to
the
““
FRONT
”
side
and
the
FRONT
L-R
balancer
to
the
“
L
“”
side,
for
example,
only
the
front
left
(LF)
channel
is
drived.
The
balance
control
circuit
is
provided
with
the
REMOTE
CONTROL
switch
which
mé&es
the
Model
RC-4
Remote
Control
Box
operative
when
the
switch
is
set
in
the
“REMOTE”
position.
In
the
“REMOTE”
position
the
balancers
on
the
Model
4100
become
ineffective
since
signals
are
led
to
the
Model
RC-4._
The
volume
can
be
varied
by
the
control
either
on
this
set
or
Model
RC-4.
However,
the
maximum
volume
level
available
by
adjustment
of
the
Model
RC4
is
determined
by
the
master
VOLUME
control
on
the
Model
4100.
6. MAIN AMPLIFIER
The
output
signals
from
the
BALANCE
control
are
led
to
the
main
amplifier
through
the
highpass
filter
circuit.
The
transistors
H601
and
H603
from
a
differential
amplifier,
directly
coupled
to
the
transistor
H605.
The
transistor
H605
drives
the
inverters
H611
and
H613
which,
in
turn,
drive
the
pover
stage
consisting
of
HOO1
and
HOO2.
Transistors
H607
and
H609
compose
a
protecion
circuit.
The
protection
circuit
will
operate
when
an
excessive
current
flows
into
the
power
transisor,