dbx 122 - Page 18

4. Adjust the dbx’s (Tape) Play Level Match control(s)
so that on louder passages the levels are approximately the
same when the BYP and PLAY switches are alternately
pressed. (For the 124 in a stereo setup, switch only the
channels 2 & 4 BYP and PLAY switches; in a 4-channel
setup,
switch
both
pairs
of
BYP
and
PLAY
switches.)
dbx Discs
dbx
encoding
makes
it
possible
to
enjoy
phonograph
discs that are 40dB quieter than conventional
discs, with
full dynamic
range and freedom
from distortion.
Since dbx
encoded
discs are cut at lower average
levels, your phono-
graph cartridge
can more easily ‘‘track’”’
the groove excur-
sions, greatly reducing
audible
tracking
distortion.
dbx discs reproduce loud peak levels that are not
practical with standard, conventional discs. Because these
loud peak levels can sometimes cause acoustic feedback,
you may need to acoustically isolate your turntable from
your speaker system; use as much physical separation as
possible, a foam mat, or any workable acoustic isolation
technique.
If dirt or static electricity build up on dbx discs, they
can create noise problems that are not solved by dbx
encoding. Since the other normal disc noises are reduced
by up to 40dB, dirt and static noises may actually become
more distracting. A good quality record cleaner plus an
effective static elimination device should solve these pro-
blems while prolonging disc and stylus life. After listening
to dbx-encoded discs for a while, you'll appreciate and
even demand quieter records.
dbx discs can be decoded with the 122, 124 or with any
other dbx !| system such as the 140 series. However, dbx
discs cannot be decoded by dbx professional models, such
as the Model 216, or dbx semi-professional models, such as
the 150 series. See Page 30 for an explanation of the
difference between dbx professional and dbx II tape noise
reduction systems.
LEFT <O
Lert TO
RIGHT O
Fig.
11
—
Special
Connections
for
dbx-Disc
Decoding
in
Systems without a Tape Recorder
7