DMP 128 Plus • DSP Configurator Software 54
Expansion and AT Inputs Overview
With the Extron Expansion Port (EXP), two EXP enabled devices can be connected for
bidirectional communication of 16 audio channels. When two units are connected, one
unit must be set as the Primary Unit and the other must be set as the Secondary Unit (see
Expansion Bus on page93). This synchronizes the sampling clocks of the two units.
AT inputs allow a DMP 128 Plus AT model to receive signal from the audio network.
Network audio routing is done with Dante Controller (see Dante Controller on page107).
Figure 91. Expansion Bus Panel with AT and Expansion Inputs
Expansion and AT Inputs Processing
The expansion and AT inputs contain two processor blocks in their signal chain:
1. Automix Block
2. Pre-mixer Gain Block
Expansion and AT Input Automix Block
One automix block is available for each expansion and AT input. This block functions the
same as the mic/line input automix block (see Input Automix Block on page40 for
information on configuring the EXP input automix block).
Expansion and AT Input Pre-Mixer Gain Block
The expansion and AT input pre-mixer gain block functions the same as the mic/line input
pre-mixer gain block (see Input Pre-Mixer Gain Block on page42 for information on
configuring the virtual return pre-mixer gain block).
Mix-Points
DSP Configurator contains twelve mix matrices that connect all inputs and outputs
(seefigure 92 on the next page). The mix matrices set post-processing mix levels.
Each input is connected to a mix-point for the signal to be routed to an output. In general,
mix levels are set relative to each other, achieving a blend of input signals at an optimal
output level, close to, but not exceeding 0 dBFS at the output.
NOTE: In order for mix-points to appear in the workspace, the input group sending
signal to the mix-point must be expanded and the input channel must be visible.
figure 91. Expansion Inputs Panel
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