SETTING
THE LEVEL ADJUST CONTROLS
For listening
convenience, three screwdriver-adjust-
able
controls are
provided
on
the rear
panel.
They
are
intended to keep
the record
and
playback
levels about
the
same, and
to
optimize
level matching
between
your
preamp,
recorder, and the
dbx 222
for
the
best headroom
and
lowest noise. The controls are factory
preset
to
provide
the desired
results
in most
installations.
Each
control adjusts two
channels
simultaneously,
so
proper
stereo
balance is maintained. ln no case
does
their setting
affect
the linearity of the dbx encode/decode
process.
Tape
Record
Level
Adiustment
1. Connect a source of
a
typical
musical
program
at
fairly
constant level to
your preamp; preferably
a record
or an
FM
radio
broadcast.
Set
the
preamp's
TAPE
MONITOR
switch
to source.
(lf
you
have an audio
oscillator or test record,
you
can use
a /
kHz tone
at
standard
reference
level.)
2.
Press
in the 222's
BYPASS
switch
(dbx
D ISC
button
out).
3. Setup
your
tape recorder for recording, but do not
record
a tape
(use
the recorder's
PAUSE
switch).
Play
the source
(i.e..
program
or
test tone) through
your
system at an average
listening level
and adjust
the
tape
recorder's
input level controls.
With
program
material,
the
peaks
should reach
+3
dB on the
peak-reading
meters
of a reel-to-reel recorder or
-8
dB
to 0 dB on a cassette
recorder. With average VU meters, the readings should
be
-10
dB to
0
dB for reel-to-reel and
-12
dB
to
-3
dB for
cassette recorders.
(A
test tone can be set within the
range of average levels indicated above.) Remember
these
levels will vary
depending on whether
your
tape recorder
has
peak
reading
meters or average
reading meters. You
will f
ind that by experimenting
with
different recording
levels,
for
different
types
of
music
or
different
types of
recording
tape,
you
can
achieve
better
results and
full
enjoyment
of
the dbx ll
recording system.
4. Now
press
in the
222's
R ECORD
switch.
5.
Without touching
any of the recorder's level
controls, adjust the
222's rear
panel
LEVEL
ADJUST
"TAPE REC" control
so
that
your
recorder's VU meters
read about the
same
as they did with the dbx
unit
SWitchCd tO
BYPASS.
6.
From
now on, adjustments
of recording
level will
be
made
with the
recorder's
input level controls.
Tape
Play
Level Adiustment
This
adjustment
is
provided
so
you
can use
about the
same
preamp
VOLUME
control setting whether
you
are
playing
a conventional tape
(222
BYPASS switch
pressed
in)
or a dbx encoded tape
1222
PLAY
switch
pressed
in).
For
this
adjustment,
you
will need
any
good quality
dbx
Type
ll encoded tape or, alternately, a source
of
a
1
kHz
test tone. Since the adjustment is
for
listening
convenience
only,
if
you
do not have
a
tone
source or a
dbx
encoded
tape,
you
can delay the
adjustment
until
after
you
record a dbx encoded
tape.
1.
Press
in the
222's
BYPASS
switch
(dbx
DISC
button out).
2. Set
your
preamp
TAPE
MONITOR
Switch
to
TAPE.
3.
Play
a dbx
Type
ll encoded
tape on
your
recorder.
You can
use
a
tape
of
program
material
with fairly con-
stant
level. For more
accurate settings,
you
can
use a
tape
recording
of
a 1
kHz tone at
-3
VU to
0
VU
recorded level.
NOTE: A
f
kHz
tape
recording
can be made using
an
oscillator
or a test
record
as a signal
source.
lf
the lkHz
13
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