dbx 122 - Page 16

WWD
Fig. 10 — Connecting the dbx 124 in a Stereo System for
Simultaneous Record and Playback
OPERATION
Setting the Play Level Match and 15
Record Level Match Controls
In many cases, a center range setting on these controls
will be “just right’ (about 12 o’clock), and in no case does
the setting affect the linearity of the dbx encode/decode
process. However, for listening convenience, the following
adjustments can keep record and playback levels the same
and can optimize level matching between your preamp,
recorder and the dbx unit for the best headroom and lowest
noise. The method of setting comparable controls on both
the 122 and the 124 is the same, despite minor differences
in control function and position.
The Model 122 has a PLAY LEVEL MATCH control
on its front panel, a knob that adjusts both tape and disc
playback level at the same time. The Model 124 has a TAPE
PLAY LEVEL MATCH control (screwdriver adjustable),
and a DISC PLAY LEVEL MATCH control (a knob), both
located on the 124’s rear panel.
The Model 122 and 124 both have screwdriver-adjust-
able RECORD LEVEL MATCH controls on their rear
panels. The 122 has two controls (one per channel}, whereas
the 124 has but one control that simultaneously adjusts all
channels that are switched to REC mode.
Record Level Adjustments
1. Connect a source of a 7kKHz tone (such as an audio
oscillator or audio test record) to your preamplifier and
set the preamp’s TAPE MONITOR switch to SOURCE. If
an audio test record or oscillator is not readily available,
you can use musical signals of fairly constant level. Set the
dbx unit as shown below: g.,=. Q-eourtd
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