dbx 128 - Playing Back dbx-Encoded Tapes; Playing dbx-Encoded Discs

14
OPERATION ~ (/f a rotary control setting is not
indicated, the setting does not affect that operation.)
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Making a dbx-Encoded Tape
1. Set the 128’s front panel switches and controls as
shown.
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2. Using an input signal that is similar in level to the
program to be recorded (or using the program itself), place
the tape machine in RECORD READY (PAUSE) mode and
set the machine’s recording level for maximum VU meter
readings of about OVU (—3 VU for cassette recorders).*
*Record Level Match Control
The REC LEVEL MATCH control on the rear of the 128 is
factory adjusted to perform well with home hi-fi or semi-pro
equipment, Exact level matching is not necessary for accurate
encode/decode operation; the control is provided for use only
when there is an extreme level mismatch between the output of
the 128 and the input of your tape recorder.
if you have to turn the input level controls on your tape
recorder to extreme high or low settings to make the VU meters
read in their normal range, then adjust the REC LEVEL MATCH
control as follows:
Place your machine in RECORD READY mode (PAUSE}
with the input level controls at a normal position (about 120’ clock
on most machines).
These, or even lower recorded levels may be used with suc-
cess because the dbx processing prevents audible tape noise.
3. Feed a normal level program (from a phonograph
disc, FM broadcast, etc.) into the tape recorder through
the 128, and adjust the REC LEVEL MATCH controljuntil
the tape recorder’s VU meters display a proper maximum
level. (about OVU for reel to reel machines, about —3 VU
tor cassette machines). Alternatively, for greater precision,
use a test record with a 1kHz tone. (Frequencies between
400Hz and 1kHz are acceptable.)
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Playing Back a dbx-Encoded Tape
1. Set the 128’s front pane! switches and controls as
shown.
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2. Place the tape machine in PLAY mode and play
the tape.
3. If the playback volume is considerably louder or
quieter than the original recorded volume, adjust the
PLAY LEVEL MATCH on the 128.