4
SECTION III
SETUP PROCEDURE
3-1 LEVEL ADJUSTMENT
Audimax III is supplied with a 20 dB fixed pad at its input to accommodate the levels usually
present at the output of consoles. The minimum input for full automatic control is -10 vu under
these conditions. However, removal of this pad permits normal operation with input levels as low
as -30 vu.
With proper input levels, average program material should cause the front panel meter to
indicate approximately 0 dB gain (this figure is relative and does not refer to actual gain of the
amplifier). In this way, the advantage of ±10 dB of level correction can be realized.
The INPUT LEVEL setting may be established by either of two methods:
a. Use a recording or other program source and adjust the INPUT LEVEL control, as
indicated above, until the average "0 dB" reading is achieved.
b. An oscillator may be used in place of the usual program sources or connected directly to
the Audimax III input. The oscillator output (at 1 kHz) should be adjusted so as to result in
a level 4 dB higher than the normal vu level of the line in which Audimax III is connected.
The INPUT LEVEL control is then adjusted for the "0 dB" reading. When an oscillator is
connected directly to the Audimax III, it is important that proper impedance matching be
observed and that no other loads are present on the line.
The OUTPUT LEVEL control is continuously variable over a 30 dB range to provide a maximum
of 11 vu with normal program input.
3-2 VARIATIONS FROM STANDARD OPERATING PROCEDURES
Three variations from standard operating procedures should be observed when Audimax III is
used:
a. If the master volume indicator is properly installed at the Audimax III output, there will be
little tendency for manual gain control at this point. In fact, the rule here should be
"DON'T TOUCH!"
b. At individual stations, however, where an Audimax III is in control, it may be desirable at
times to readjust levels slightly. This should be done slowly, whether the program level is
too low or too high.
c. A third change of procedure concerns "fades". Since Audimax III will defeat any slow
deliberate reduction of level, all fades must be made more quickly than by usual
methods. A little practice will easily result in the required skill. The most convenient way
to insure proper procedures at all locations is to connect all cue lines to some point
beyond the Audimax III output.
3-3 GATED GAIN STABILIZER
The function of the Gated Gain Stabilizer (GGS) is to make the following decisions: Should the
gain be increased when a lapse occurs in the audio? This is especially important for television
and motion pictures where these lapses occur quite often. To prevent level increases of system
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