Fine-Tuning with APGraphic EQ
23
Precis DSP Instruction Manual
Adjusting Digital Input Gain
Inputs are set to unity gain at the factory and have a gain adjustment range of -10 dB to +10 dB.
Input gain adjustments should be made before the outputs are fine-tuned. Inputs cannot be muted.
Purpose & Application of Input Gain Adjustment
Adjusting input gain (the nominal level of the signal from the source device) allows source signals of
varying amplitudes to be equalized before they are routed and the volume is adjusted. Equalizing source
levels provides a consistent reference for volume adjustments and eliminates jumps when routing a new
input to an output.
A typical application of input gain adjustment is for switching consumer and professional grade audio
equipment (whose levels can vary noticeably) in the same system.
Process for Equalizing Input Levels
The following steps tell how to adjust input gain as part of the process of equalizing input levels.
Caution:
We strongly recommend that input gain adjustments be made only by a qualified installer
or dealer.
To adjust input gain:
1.
Using the CrossBar, route the input needing adjustment to an output.
2.
From the main interface, open the Options menu and select Show > Input Gain View.
The Input Gain dialog box opens.
3.
From the Input Device list, select the input just routed.
4.
Adjust the slider until the desired gain level is reached.
5.
Repeat Steps 1 through 4 as necessary for all inputs that will be routed to the same output.
Note:
The total through-system gain (the amount of input gain plus the amount of output gain) for
any input to output routing path cannot exceed 10 dBr. If an input gain command is entered that
exceeds 10 dBr when it is combined with the gain (volume) of an output, the command will be
accepted (and will be indicated in status results) but will not result in an audible difference of more
than 10 dBr.
Input Gain slider
Input Device list
