DTP CrossPoint 4K Series Matrix Switchers • Matrix Software 149
Adjusting the Pre-matrix Trim
The pre-matrix trim control can be used to compensate for any level changes caused by
signal processing before the trim control. Adding a compressor generally reduces the signal
level, while a filter can either boost or cut the overall signal level.
NOTE: This procedure is valid only if no processing is active in the output signal path,
and if post-matrix trim value is set to 0 dB (unity gain). If you have processors inserted
in the output signal path, open them and bypass them to temporarily remove them
from the signal path.
1. After you have set the input gain, add any processors that you wish to use into the input
signal chain.
TIP: If you make changes to filter settings after you have set your dynamics
processors, recheck the levels in your dynamics processors to make sure that they
are still valid.
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.
TIP: This is a good baseline. If, after you’ve set up your microphone input gain 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 Calibrating Loudness on page 151 for more information).
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).
TIP: Remember that the output volume control is essentially the same volume
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 Adjusting the Post-matrix Trim on the next page).
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