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5.0 OPERATION
The COMPELLOR is ideal for any application requiring automatic and
completely transparent, dynamic range control. Other gain control devices
either degrade audio quality or need constant adjustment, which prohibits
their use for many applications. The COMPELLOR has no audible effect
other than level control. You simply determine how " tight" ( a relationship
between the highest and lowest levels) you want the dynamic range to be,
and the COMPELLOR does the rest. It will automatically control its operat-
ing parameters in response to varying program material. To operate the
COMPELLOR, follow the listed steps in the Initial Settings section. If you
have purchased a Model 303, also read the section on AURAL EXCITER
Initial Settings at the end of this chapter.
5.1 COMPELLOR Initial Settings (All Models)
After the COMPELLOR has been properly installed, perform the following
steps to familiarize yourself with its operation.
1.
Send a 0 VU tone to the COMPELLOR. Set the METER SELECT switches
to PROGRAM and INPUT. Adjust the COMPELLOR controls to match
the initial settings shown in Fig. 5-1. You should observe a 0 VU indica-
tion on the meter. If not, refer to INSTALLATION (Section 3.0) for
details.
NOTE...d
Fig. 5-1. Model 300 initial
settings (one channel
shown). DRIVE is initially
set at full clockwise position.
On the Model 300, leave the STEREO ENHANCE Switch in the OUT
position ( no LED indication). When the STEREO ENHANCE Switch is
OUT, the Model 300 still functions as a stereo device. If you need
independent channel action, refer to CIRCUIT MODIFICATIONS
(Section 8.0) for details. If you have a Model 303, make sure the AURAL
EXCITER is in the OUT position.
=1_ = PROGRAM
YELLOW
_IZL = OUT ...CL = OUT
2.
Select GAIN REDUCTION on the METER SELECT Switches, as shown
in Fig. 5-2. Read the meter and adjust the DRIVE and PROCESS BAL-
ANCE Controls until you achieve the desired amount of GAIN REDUC-
TION. With audio program, adjusting these controls will determine how
much the lowest-level signal will be raised.
Operation 5-1
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