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I N STA L L AT I O N •
LCD PROGRAMMING
29
Last Mic Mode. There are three modes of last-mic operation: last
on, mic 1 and off. Last On leaves the last-activated microphone full
ON until another microphone input is gated ON. Mic 1 allows the
AP400 to revert back to a mic 1 input when all microphones gate
off. The default setting for Last Mic Mode is OFF. To change a last-
mic mode option, select it, edit the value, and press ENTER.
Gate Ratio. The gate ratio specifies how much louder the micro-
phone audio level must be above the ambient level before a micro-
phone gates ON. Remember, this value is relative to the ambient
level. If adaptive ambient mode is ON, the actual on-threshold
changes as the ambient level changes. The adjustment range is
from 0–50dB in 1dB increments. Default setting is 15. If the micro-
phones frequently gate ON when no one is speaking, increase the
gate ratio.
Off Attenuation. This sets the amount of level reduction applied to a
microphone when it is OFF (Figure 18, below). Low values increase
the amount of echo and reverberation allowed into the system. If
the value is set high, you may be able to hear the microphones gate
on and gate off as the background noise is reduced. The adjust-
ment range is from 0–50dB in 1dB increments. Default setting is
12. As more and more microphones are added to the system, the
off attenuation should be adjusted toward 50 (high).
Microphone On
Microphone Off
Noise Floor
Off
Attenuation
Figure 18. Off Attenutation diagram
