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Adjusting Pre-mixer Gain
After setting input gain, add desired processors into the input signal chain. The pre-mixer
gain control (
b
) may be used to compensate for level changes due to processing. Adding
a compressor generally reduces the signal level, while a filter may boost or cut the overall
signal level. If changes are made to filter settings after setting dynamics processors,
re-check the levels in the dynamics processors to make certain they are still valid.
NOTE: This procedure is valid only when there is no active processing in the
output signal path, and if the post-matrix trim value is set to 0dB, unity gain. If
processors are inserted in the output signal path, engage Bypass to temporarily
remove them.
To adjust pre-mixer gain:
1. Open the line input gain (
a
), output volume (
e
), and pre-mixer gain (
b
) dialog boxes.
2. Connect program material (or pink noise) at the input,
3. Set the output volume to 100% (mute if necessary).
4. Adjust the pre-mixer gain (
b
) so the meter level on the input gain dialog matches the
meter level of the output volume dialog. This will maintain the audio at an optimal level
in the input signal chain.
This sets a good starting point. After setting up the mic input gain and mix-point levels,
output processing, and trim levels, if more headroom is required to prevent clipping at
the outputs, return to the pre-mixer gain controls (
b
) and lower each one by specific
amounts. Further minor adjustments to the pre-mixer gain controls will help to balance out
perceived audio levels of the different inputs.
When using the pre-mixer gain for output volume control, the procedure may be reversed.
Set pre-mixer gain to 0dB. With program material (or pink noise) present at the input,
adjust the output volume until the meter level in the output volume dialog box is below
clipping (or ideally, matches the level at the input gain meter).
Setting Output Gain Structure
Add all desired processors into the output signal chain. Keep in mind a filter may boost
or cut the overall signal level and adding a compressor generally reduces the signal level.
Inserting either or both may require resetting of the output volume.
Since a limiter is the most likely choice for output processing and can only reduce the
signal to prevent overload, a reduction of output level does not have to be considered.
Loudness will boost the overall signal level, but only at lower volume settings
After adding processors to the output signal chain, the output volume level may clip when
set to 100% (or less). Floating point DSP allows clipping to be overcome by lowering the
output volume (
e
) setting. However, unless a user is prevented from changing the volume
setting to 100% (or to any position where clipping occurs), it is best to adjust the pre-
mixer gain (
b
) or post-mixer trim (
d
) control to prevent any possible clipping.
Alternately, use the post-mixer trim controls to adjust output volume. Post-mixer trim
controls provide 12dB of gain, so use a group master with soft Limits to control levels,
setting an upper limit of 0dB or less. Mic levels will also contribute to possible clipping
at the outputs, and may need to be lowered to maintain the balance between program
material (line outputs) and voice.
DMP128 • Software Control 104