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System Configuration ~ Inputs and Outputs
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Optimizing input gain structure
How you adjust an input’s gain directly affects sound quality. The optimal input gain
setting is one which is adjusted as high as possible above the noise floor without
introducing clipping. Clipping can cause distortion which can damage amplifiers and
loudspeakers.
To adjust the input level properly, place a signal on the input at the maximum
level it will generate. Adjust the input gain until the peak level of the input, as
shown on the Input meter, just begins to enter the red (clipping) zone, then reduce
the gain slightly until peaks no longer climb into the red zone. This setting will
ensure that the XAP 400 maximizes the signal-to-noise ratio without clipping the
signal.
Meters
There are four meters on each mic/line input to assist with setup and level control.
Select the meter check box to enable the meter. All input meters are peak-level.
Pre Gain
Pre Gain meter indicates the input’s level before gain adjustments. Meter range is
from -85 to -35dB when 55dB gain is selected; -55 to -5dB when 25dB gain is
selected; and -65 to 20dB when 0dB gain is selected.
Post Gain
Post Gain meter shows the input’s level after gain adjustments have been made.
Meter range is from -30 to +20dB.
Post Processing
Post Processing meter indicates the level at the gating point after the signal has
passed through input processing. It reflects the post-AGC signal. Meter range is from
-30 to +20dB.
Post Gating
Post Gating meter shows audio level after it has passed through the gating
parameters. Meter range is from -30 to +20dB.
Figure 3.44 Meter locations in the Inputs 1–4 signal path
Figure 3.45. Mic
input meters