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Installation ~ LCD Programming
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AEC Reference
There are two options for this parameter: EC Ref 1 and EC Ref 2. EC Ref 1
(default) references Output D (typically used for connection to a power amp and
speaker). EC Ref 2 is not factory set. EC Ref 2 is typically used in sound-
reinforcement applications. This allows for the AP800 to provide two zones of sound
reinforcement per AP800 unit.
Echo Canceller
Activate or deactivate the echo cancellation feature for each gated input. Factory
default is on.
NLP Adjust
Non-linear processing (NLP) has four settings: soft (6dB), medium (12dB),
aggressive (18dB), and Off. NLP adds echo cancelling “horsepower” to the echo
canceller in difficult 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, B, C, D
The parameter submenus below this level control how inputs A, B, C, and D deal
with input audio. There are three parameters that can be applied to these inputs:
gain adjust, AGC, and mute (see Figure 2.15).
Gain Adjust
This adjusts each input’s gain (ranging from -20dB to 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). AGC keeps softer and louder
input audio at a consistent level. This feature is disabled when shipped from the
factory.
Mute
This parameter mutes a particular input channel.
or
Figure 2.15. Inputs A-D Submenu