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2.
Open the line input gain dialog box, the output volume dialog box, and the pre-matrix
trim dialog box.
3.
Set output volume to 100%. If the audio is too loud or distracting, mute the output.
4.
With program material (or pink noise) present at the input, adjust the pre-matrix trim so
that the meter level in the output volume dialog box matches the meter level in the input
gain dialog box. This maintains the audio at an optimal level in the input signal chain.
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and mix-point levels, output processing, and post-matrix trim levels, you find that
you need more headroom to prevent clipping at the outputs, return to the pre-
matrix trim controls and lower each trim by the same dB amount.
You may also find that further minor adjustments to the pre-matrix Trim controls
help to balance out the perceived audio levels of the different inputs.
Finalizing the Output Gain Structure
Adding a compressor generally reduces the signal level, while a filter may boost or cut the
overall signal level. Loudness boosts the overall signal level, but mostly at lower volume
settings (see
1.
Add any processors that you wish to use into the output signal chain.
After adding processors to the output signal chain, the output volume level may clip
when set to or near 100%.
2.
Set output volume to a level where clipping is eliminated.
NOTE: Mic levels also contribute to possible clipping at the outputs. They may need
to be lowered at the mic mix-points to maintain the balance between program
material (line inputs) and voice (mic).
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control that is accessible to a front panel operator. An operator may unknowingly
change the volume back to a level where clipping occurs. You can reduce the
chance of this inadvertent clipping by using the post-matrix trim control rather than
the volume control (see
Setting the Mic Input and Mic Mix-point Levels
1.
Double-click the mic mix-point to be set, opening the dialog box for that mix-point.
2.
Unmute the mix-point (mixing in the mic signal). The default level is 0.0 dB, or unity gain.
3.
Connect your chosen microphone to mixed mic/line input.
4.
Open the mic input gain dialog box for the mixed mic.
5.
If your mic requires phantom power, turn it on in the mic input dialog box.
6.
Unmute the mic/line input.
7.
While testing the mic, raise the mic gain fader until the mic is clearly audible.
The gain level and the mic gain meter level reading vary at this point, but as a general
guideline, the input gain level is approximately 40 dB to 50 dB and the meter averages
approximately -20 dBFS.
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optimization difficult for these inputs. Having the meters average around -20 dBFS
gives enough headroom to accommodate sudden changes to voice levels. Further
adjustment may be necessary.
This is a good baseline. If, after you've set up your microphone input gain
Calibrating Loudness
on page 128).
Remember that the output volume control is essentially the same volume
Adjusting the Post-matrix Trim
Voice levels at microphone inputs can vary greatly, making audio
DTP CrossPoint 84 Series Matrix Switchers • Matrix Software
on page 128).
127
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