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I N STA L L AT I O N •
LCD PROGRAMMING
35
Echo Canceller. Activate or deactivate the echo cancellation fea-
ture for each gated input. Factory default is ON.
NLP Adjust. Non-linear processing (NLP) has four settings: soft (6
dB), medium (12dB), aggressive (18dB), and OFF. NLP adds addi-
tional echo cancelling "horsepower" to the echo canceller in diffi-
cult acoustic environments. Care should be taken when using NLP
because of the corresponding trade-offs which potentially include
suppression and half-duplex operation. The factory default is SOFT.
Inputs A-D, Telco
The parameter submenus below this level control how inputs A, B, C
and D and Telco In deal with input audio. All parameters described can
be applied to INPUT A–D and Telco. Three input parameters can be
applied to the inputs: gain adjust, AGC and mute (See Figure 24).
Gain. This adjusts each input’s gain (ranging between -20dB and
20dB). In conjunction with the LCD readout and the LED bar graph,
all gated inputs can be simply calibrated for the right level on the
mix bus. The default setting is 0dB.
AGC. Each input can use automatic gain control (AGC). This fea-
ture keeps softer and louder input audio at a consistent transmit
level. This feature is disabled when shipped from the factory.
Mute. This parameter mutes a particular input channel.
Subbus
The subbus parameter allows control of gain (attenuation) of mix audio
from the microphones into the speaker audio. The attenuation can be
adjusted in dB.
Gain. The subbus gain can be adjusted over a range of 0 to -20dB
in 1 dB increments. The default setting is -6dB.
Power-Up Screen
Gentner AP400
Version 2.0
Inputs
Gain
AGC
Mute
Input A - D, Telco
Figure 24. Inputs A–D Parameters
LCD submenu
Power-Up Screen
Gentner AP400
Version 2.0
Subbus
Gain
Figure 25. Inputs A–D Parameters
LCD submenu
