I/O CALIBRATION AND SYSTEM SETUP
ENG
Page 47
19.2 ANALOG INPUT LEVEL ADJUSTMENT
Skip this step if you are not using the analog inputs.
This step calibrates the analog inputs to the level at which your studio system peaks its program material on
the studio meters. This assures that the processing presets will operate in their optimal range.
To take full advantage of the processor potential, the AGC value should normally operate in
compression mode (meaning that it slightly reduces the input level). This is indicated on the display by a
negative sign (the image here below indicates f.i. – 3 dB), while a positive sign means there has been an
expansion or gain increase. When the message ‘Gated’ appears on the display, it indicates that there is no
incoming signal, or the signal is below the minimum AGC threshold.
The gain factor applied by the input stage to the incoming analog signal is set by the ‘Gain Offset’ control. It
is crucial in order to ensure a standard signal of 0 dB to the internal processor circuits. For example: with a
signal of 0dB, the Gain Offset should be set to 0dB; with a signal of +4dB, the Gain Offset should be set to –
4 dB.
DEFAULT SCREEN
INPUT CALIBRATION menu
GAIN OFFSET page
1) Play program material from your studio, peaking at the level to which you normally peak program
material (typically 0VU if your console uses VU meters).
In most pop and rock formats this is not a problem, but in classical or other wide dynamic range formats
you may have to wait for the loudest passage.
2) adjust the Gain Offset parameter in the ‘Input Calibration’ menu until the AGC indicator display averages
around - 2 / - 3 dB with the most part of Yr standard source material.
3) NOTE: If the Gain Offset control is not enough to achieve the AGC condition described above, adjust the
output levels of the audio source directly (mixers, PC audio cards, etc.). It may be acceptable to work
with AGC levels between -3 /- 4 dB and +3 / +4 dB.
4) If Yr studio console or studio system can generate a test tone, you may also adjust the Gain Offset level
with that standard reference/line-up level tone (recommended).
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