ClearOne AP800 - Manual (Page 29)

25 Installation ~ LCD Programming
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Routing Guidelines
The audio matrix consists of sources and destinations. There are 25 possible input
sources and 17 destinations.
Internal Subbus
Subbus 1, 2. The AP800 is equipped with two internal sub-mix buses. The subbus is
a matrix output which allows signals to be mixed and level controlled. The subbus is
then made available as an input to the matrix for further signal routing.
G-Link bus
This digital bus appears on every Audio Perfect product. This mix-minus bus routes
audio to any destination on the G-Link network. The AP800 has four digital buses:
X-bus, Y-bus, Z-bus and G-Link EC Reference bus (see Echo Cancellation Setup
below). See page 6 for complete descriptions of each bus.
Echo Cancellation Setup
EC Reference 1, 2. The EC reference tells the microphones which output will be used
as the sample reference for echo cancellation. EC REF 1 (default) references Output
D (typically used for connection to a power amp and speaker). A unit will support
one common EC reference for all eight microphones (as shown in Figure 2.19).
However, in the case of splitting a single AP800 unit into two zones or two mic
mixers, it will be able to support two EC references – one for each zone or mixer.
Figure 2.18 Default routing matrix