Vortex Media VTX 1000 - Manual (Page 56)

Most of the default parameters of the Vortex EF2280 will satisfy our design such as microphone gains.
However, we will need to re-label the EFBus for clarity and change the Automixer, Matrix Mixer, Output
Filters, and Presets to satisfy our design goals.
Automixer
One of our design requirements was to make each Vortex device operate as one 12-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 linked units. By default, the L OCAL M AX NOM is set to 4
and the Bus Mixer is set to 1 (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)).
EFBus
The default routing of the EFBus will be sufficient for our design. However, for clarity, the labels have been
changed to reflect the signals that are placed onto the bus and all unneeded cross-points have been muted.
Since the Vortex EF2241 uses the P Bus to send telephone and SoundStation VTX 1000 audio to the Vortex
EF2280 and the ID of the Vortex EF2241 is 01, the audio signal PB1 needs to be routed to Input PM0 of the
Vortex EF2280. Also, for sound reinforcement purposes, each Mic Input audio signal of the Vortex EF2241
has been placed in its own channel. This means that Input 9 has been assigned to WB1, Input 10 assigned
to XB1, Input 11 assigned to YB1, and Input 12 assigned to ZB1. Remember that the signals that a unit
places onto the EFBus is put into a placeholder where that placeholder is identified by the device ID of the
unit that put the audio signal into this placeholder. Here, the Vortex EF2241 places audio onto the P, W, X,
Y, and Z Buses and since the unit has a device ID of 01, the placeholders are identified as PB1, WB1, XB1,
YB1, and ZB1 where the "B" stands for bus. The Vortex EF2280 takes those signals from the bus and
internally assigns those signals to various submixes. In the case of the P Bus, the Vortex EF2280 assigns
that audio to one of two mixes for the P Bus: PM0 or PM1 where the "M" stands for mix. In the case of the
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