ClearOne AP400 - Manual (Page 31)

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Installation ~ LCD Programming
G-Link X-Z buses
See page 7 for a description of this submenu.
EC reference and PA
The EC reference tells the microphones which output will be used as the sample
reference for echo cancellation. EC REF references Output D (typically used for
connection to an external amp speaker). A unit will support one common EC
reference for all four microphones (as shown in Figure 2.21). Note that the PA
output follows the settings for the EC Ref. This is because any audio being sent to a
speaker must be used as EC Ref for Echo Cancellation to work properly.
Subbus
The AP400 is equipped with one internal sub-mix bus. 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.
Figure 2.20. Default routing matrix
Figure 2.21. Echo cancellation setup default matrix