Gentner XAP 800, Service Manual

Page: 20 / 67

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INPUTS AND OUTPUTS • INPUTS 9-12
19
On Off
Input
Gain
Input
9-12
On Off
Mute
To Matrix
AGC
Figure 8. Inputs 9-12
Adaptive Ambient (On or Off). In the ON mode, the ambient level used to
calculate gating is based on the room’s actual noise floor, integrated over time, as
measured by the input in the room. In the OFF mode, the manual ambient level is
set by the integrator, and will be used to calculate gating.
Figure 8 shows inputs 9-12. These line-level inputs can be level controlled, muted,
and gain controlled through the AGC. All of these functions operate identically to
inputs 1-8.
Outputs
All 12 of the line outputs are identical, as shown in Figure 9. Three functions are
associated with each output: gain control, mute, and NOM (number of open mics).
Gain control allows you to set the output level. the min/max controls allow you to set
minimum and maximum gain levels that the user will be limited to. The mute function
essentially turns the volume off. All of these functions can be controlled via the RS-232
port or the control/status connector. An example would be if you want to control the
volume of the speakers—you could use two control pins on the control/status
connector for volume up and volume down. Another pin could be used for mute.
Activation of NOM places this output ONLY in a mode where, as more microphones
routed to this output are gated on (either by auto gate or manual gate), the total overall
output gain will remain constant. This reduces the possibility of feedback occurring.
A feature of the XAP 800 is its ability to provide NOM at every output. Most automixers
have a single master NOM output. NOM is used to maintain a constant acoustic gain in
the room, permitting the system to optimize its gain before feedback status. This is
most useful in sound reinforcement applications.
Outputs
1-12
On Off
Mute
On Off
NOM
Output
Gain
From
Matrix
Figure 9. 12 Outputs from Matrix