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Marantz Model 4270 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.
OLBV
CAL
IBRATI
ON
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
to
a standardized level
of
580mV.
The Model
4270
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 and 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.
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
Dolby
standard alignment tape which
will
make all
of
your
Dolby
recordings universal
with
any other
Dolby
system. These tapes are
available in
the
standard reel-to-reel, cassette and
8-Track formats.
If
you desire one
of
these tapes,
enclose a check or money order
for
$4.95
for
each tape desired (California residents add 5%
sales
tax). Be sure
to
specify which
format
is
desired. Mail
to:
MARANTZ
NATIONAL
PARTS
P. O. Box 99
Sun Valley, California
91352
NOTE: The
Dolby
system can be used
with
most types
of
tape recorders. However,
it
can-
not
be used
with
a recorder
utilizing
Automatic
Recording Level system (A LC).
PROCEDURE FOR
PLAYBACK
CALIBRATION
1.
Turn
on the Model
4270
and
your
recorder.
2. Set the
DOLBY
function
switch on the
Model
4270
to
the
PLAY
position.
3.
If
your
recorder has a SOU RCE!TAPE
(MONITOR)
Switch, set
it
to
"TAPE".
4. Load
the
Dolby
standard alignment tape.
5. Play
the
Tape.
6.
If
your
recorder does
not
have
output
level controls, proceed
to
step 9.
7. When 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
neither 6
nor
7
apply
to
your
recorder,
set
the
output
level controls
to
about
2/3
of
full
output.
9.
Adjust
the
PLAY
CAL
controls
(left
and
right) on the
4270
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 ad
just
the right
PLAY
CAL
control,
place
the
METER
Switch
to
the
"IN"
position.
10. You have
now
properly
calibrated the
Dolby
Playback Level. From this
point
on, do
not
change
your
recorder's
output
level
contro
ls
or
the
Model 4270's
PLAY
CAL
controls.
14
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