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Marantz Model 4300 Manual

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BASIC
DOLBY
PROCESS
The Dolby
system
increases
the
level
of
low-level,
mid-
and
high-frequency
signals
during recording
and
reduces
the
level
of
these
signals
by
an
identical amount during playback.
As
a result,
the playback
signal
is
identical
to
the original
soUrce
signal,
but
the
level
of
background noise
generated
by the tape recorder
is
greatly reduced.
A Dolbyized
FM
broadcast
has
already
been
subjected
to
the first
phase
of
the
noise
reduction
process
before
it
is
transmitted.
When
these
signals
pass
through the Dolby playback circuitry,
the mid-
and
high-frequency
noise
is
greatly
reduced.
DOLBY
CALIBRATION
The purpose
of
the following adjustments
is
to
achieve
the proper Dolby
levels
by calibrating
the recording
and
playback
signals
being applied
to
the Dolby
processors.
The Model 4300
is
capable
of
processing
Dolby
signals
from
sources
other than a tape recorder
(AUX, PHONO, FM, ETC.).
NOTE:
It
is
possible
to
use
the Dolby system
for
recording
al')d
,playing
back
tapes
through your
system
without
using a standard alignment tape.
Procedures
for
making your own Dolby Align-
ment
Tape
are
as
follows:
1.
Thread a blank tape onto your recorder
(or insert a cassette).
2.
Set
the 400Hz TONE Switch to the
"ON"
(in) position.
3.
Set
your recorder's monitor switch
to
the
source position.
4.
Set
your recorder's record
levels
to
0 VU.
5.
Commence recording.
Record
about 45
se-
conds
of
the tone. This tape you
have
just
made
is
used
to
calibrate the Marantz Dolby
circuit with the recorder.
6.
Switch
off
the 400Hz TONE.
However, a Dolby recording
made
on your
re-
corder using the calibrated tape you
have
just
made
may
not
necessarily
be
compatible with the
Dolby circuits in a different recorder
or
systems.
Therefore,
for
universal compatibility, Marantz
offers a standard alignment tape which
is
avail-
able
from your local Marantz dealer.
NOTE: The Dolby
system
can
be
used
with
most
types
of
tape recorders. However,
it
cannot
be
used
with recorders utilizing one
set
of
level
control
wh
ich
govern
both record
and
playback
levels,
or
with recorders utilizing
an
Automatic
Level
Control (A.L.C.) system.
PROCEDURE
FOR
PLAYBACK CALIBRATION
1.
Turn on the Model 4300
and
your
recorder.
2.
Set
the DOLBY function switch
on
the
Model 4300
to
the
PLAY
position.
3.
If
your recorder
has
a SOURCEITAPE
(MON ITOR) Switch,
set
it
to
"TAPE".
4.
Load
the Dolby standard alignment tape or
the calibration tape you
have
made.
5.
Play
the
Tape.
6.
If
your recorder
does
not
have
output
level
controls, proceed
to
step
9.
7.
If
your
recorder
has
output
level
controls
and
the meters
on
the recorder
read
play-
back
level, adjust the controls until the
meters
read
"OVU".
Then proceed
to
step
9.
8.
If
step 7
does
not
apply
to
your recorder,
set
the
output
level
controls
to
about 2/3
of
fu
II
output.
9.
Adjust the
PLAY
CAL
controls (left
and
right)
on
the 4300
to
the DOLBY LEVEL
reference
on
the SIGNAL·STRENGTH
Me-
ter. To adjust the left
PLAY
CAL
control,
place
the METER Switch
to
the
"OUT"
position. To adjust the right
PLAY
CAL
control, place the METER Switch
to
the
"I
N"
position.
10.
You
have
now properly calibrated the Dolby
Playback
Level.
From this point on, do
not
change
your recorder's
output
level
controls
or the Model 4300'5
PLAY
CAL
controls.
14
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