Vortex Media VTX 1000 - Manual (Page 51)

Matrix Mixer
The matrix mixer will need to be changed from the default settings in order to send Inputs 1-4 as well as
Output W, X, Y, and Z bus channel. Note that since Inputs 1-4 are microphones, the cross-points are
colored blue to indicate that they are gated to Outputs W, X, Y, and Z. The default routing to Output B and
T will satisfy our design goals.
The outputs P, W, X, Y, and Z are signals that will be sent over the EFBus to the Vortex EF2280. See the
section entitled Conference Composer Layout Vortex EF2280 to find out how to take those signals from the
bus and send them to the loudspeakers and video codec.
Input B and Output B are set to +10 dB and -10 dB respectively. Please refer to the section entitled “Gain
Structure” under the W
IRING THE S OUND S TATION VTX 1000 TO A V ORTEX DEVICE heading for more information as
to the reasoning behind the gain levels.
We will set Output D to -30 dB in order to protect the subwoofer from "bottoming out" on high-amplitude
transient sounds.
The output R1 is our Acoustic Echo Canceller (AEC) reference signal. This signal is what the internal AEC
uses to remove from the local microphones. In our example, we will remove the codec, telephone,
SoundStation VTX 1000, and program audio from the local microphones. Note that local microphones are
not included in the Reference Signal even though we are reinforcing them.
Local Microphones should NEVER be included in the reference signal!
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