dbx 122 - Page 9

BRIEF
OPERATING
INSTRUCTIONS
To Make a dbx-Encoded Tape Recording
1,
Set
the
preamplifier’s
INPUT
SELECTOR
to
the
appropriate
source
(i.e.,
PHONO,
TUNER,
or
AUX).
2.
Press
the
dbx
REC
switch(es)
and
the
dbx
TAPE
switch.
3. Place the tape machine in Record mode, and adjust
the tape machine for peak meter levels typically 3 to 6VU
lower than normal. (With dbx processing, significantly lower
record levels are often required to eliminate tape saturation,
particularly in cassette recording. Experiment during initial
setup to find the appropriate levels.)
4. Do not switch the dbx unit while making the
recording. ‘
To Play a dbx-Encoded Tape Recording
1. Set the preamplifier’s TAPE MONITOR switch to
TAPE.
2. Press the dbx PLAY switch(es) and the dbx TAPE
switch.
3. Place the tape machine in Play mode, and adjust the
preamplifier
VOLUME
and/or
the
PLAY
LEVEL
controls
on
the
tape
machine
for
the
desired
listening
volume.
To Play a dbx-Encoded Phonograph Disc
1. Press the dbx PLAY switch(es) and the dbx DISC
switch.
2.
Set
the
preamplifier’s
INPUT
SELECTOR
to
PHONO,
and
set
the
TAPE
MONITOR
switch
to
TAPE.
3.
Play
the
encoded
record,
and
adjust
the
preamplifier’s
VOLUME
control
for
the
desired
listening
volume.
INTRODUCTION
The
tape
recording
process
traditionally
has
been
one
of
the
major
sources
of
noise
in
recorded
music.
The
dbx
tape
noise
reduction
system
eliminated
tape
hiss
that
would
otherwise
be
introduced
by
the
tape
recorder.
In
addition,
dbx
processing
permits
recordings
to
be
made
at
levels
that
avoid
much
of
the
distortion
which
normally
occurs
in
tape
recording.
As
a
result,
dbx
equipment
not
only
reduces
noise,
it
can
vastly
improve
tape
machine
performance.
With
dbx
processing,
the
only
noise
heard
on
playback
is
that
noise
which
was
present
in
the
original
program.
Taped
records,
upon
playback,
will
sound
just
like
the
original
disc;
taped
FM
broadcasts,
upon
playback,
will
have
no
more
noise
than
was
present
in
the
original
reception
of
the
program;
and
recordings
of
live
music,
conversation,
and
so
forth,
will
be
indistinguishable
from
the
live
event.
These
genuine
improvements
in
the
quality
of
tape
record-
ings
are
due
to
a
phenomenal
increase
in
recordable
dynamic
range
and
the
complete
absence
of
audible
tape-
induced
noise.
The
dbx
Model
122
has
two
processors
for
recording
or
playback
of
a
stereo
program.
The
dbx
Model
124
has
four
Processors,
essentially
two
Model
122’s
in
a
single
unit.
The
124
is
switchable
for
recording
or
playback
of
a
four-
channel
program,
or
for
simultaneous
recording
and
off-
tape
monitoring
of
a
stereo
program.
Both
models
share
the
same
high
standard
of
performance,
in
excess
of
30dB
broadband
tape
noise
reduction
with
a
simultaneous
10dB
improvement
in
headroom
in
the
tape
recording
process.
Both
models
may
also
be
used
to
decode
special
dbx
encoded
phonograph
discs.
These
discs,
available
through
many
hi-fi
stores,
are
up
to
40dB
quieter
than
a
conven-
tional
disc
and
can
provide
full
music
dynamic
range.
The
dbx
disc
decoding
circuits
are
not
designed
to
reduce
noise
on
conventional
phonograph
records.
Neither
can
the