Vortex Media VTX 1000 - Manual (Page 76)

Some of the default parameters of the Vortex EF2280 will satisfy our design. However, we will have to
change the Automixer, Matrix Mixer, and Presets to satisfy our design goals.
Automixer
One of our design requirements was to make all Vortex devices operate as one 16-channel automixer in
order to limit the maximum number of open microphones to 4 across both units. In order to achieve that,
we need to set the G
LOBAL M AX NOM to 4 on both Vortex EF2280’s. We will also set the L OCAL M AX NOM to
4 as well. The difference between the Local Max NOM and the Global Max NOM is that the Local NOM
refers to the number of microphones that can gated on within a single unit. The Global NOM refers to the
number of microphones that can be gate don across both units.
The Bus Mixer is set to 1 in each unit. The Bus Mixer refers to the ability of each unit to send and receive
the Automixing information from each unit over the EFBus. In order for both units to function as one
automixer, the Bus Mixer ID needs to be set to the same value. In this case, the default is 1. A Bus Mixer
ID of 0 means that each unit will function as a separate Automixer and that unit will not send its automixer
information to any other linked unit(s).
Matrix Mixer
The matrix mixer will need to be changed from the default settings in order properly send Microphones 9-16
from Vortex EF2280 ID 01 to Vortex EF2280 ID 00. The microphone / EFBus assignments were based on the
relationship of the microphones and loudspeakers in the room so that in Vortex EF2280 ID 00 we can
achieve uniform sound reinforcement in the room. Remember that people who will be sitting furthest from
the loudspeaker zone will receive the most amplification and those who are sitting closest to the
loudspeaker zone will receive either no reinforcement or very little. By assigning different microphones to
different EFBus channels, we will have the ability to create the appropriate reinforcement zones with the
appropriate levels in Vortex EF2280 ID 00.
Please see the Matrix Mixer for Vortex EF2280 ID 00 for more information.
Note that the AEC for each Input 1-8 has been set to Bus. This signal is generated from the R1 mix of
Vortex EF2280 ID 00 and Vortex EF2280 ID 01 is using this signal from the EFBus as its echo canceller
reference.
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