Extron Electronics DMP 64 User Guide - Manual (Page 73)

Secondary Mix Matrix
The DSP architecture contains a secondary mix matrix that connects the mic/line inputs
and virtual bus return signals to the virtual bus sends. The DSP Configurator user interface
provides control of the secondary mix matrix, used to set levels from the post-processing
input line and virtual bus return signals to the virtual bus sends. Each of the six mic/line
and four virtual return inputs connect to a mix-point for virtual bus A through D. Each
mix-point is muted and set to 0.0 dB (unity gain) by default. In general, mix levels are set
relative to each other, achieving a desired blend of input signals at an optimal level close
to, but not exceeding 0 dBFS at the output volume level meter.
The secondary mix matrix contains a section (see figure 44) allowing virtual bus returns
to be routed back to the secondary matrix to allow further processing using an additional
virtual bus processing block. To prevent feedback loops, a virtual channel is prevented
from being routed back to itself by eliminating the mix-point that would allow that to occur.
In situations requiring extra processing, the virtual bus return output is routed back to the
secondary mix matrix, virtual bus send, which then routes the signal back to a processing
signal chain other than the one it was routed from.
Mic/Line Input 1
Mic/Line Input 2
Mic/Line Input 3
Mic/Line Input 4
Mic/Line Input 5
Mic/Line Input 6
A
B
C
D
1
2
3
4
5
6
A B C D
1
2
3
4
Outputs
Virtual Bus Send
Virtual Bus Return
FILT DLY LOUD DYN VOL TRIM
FILT DLY LOUD DYN VOL TRIM
FILT DLY LOUD DYN VOL TRIM
FILT DLY LOUD DYN VOL TRIM
GAIN GAIN FILT FBS DYN DYN DLY DUCK
GAIN GAIN FILT FBS DYN DYN DLY DUCK
GAIN GAIN FILT FBS DYN DYN DLY DUCK
GAIN GAIN FILT FBS DYN DYN DLY DUCK
GAIN GAIN FILT FBS DYN DYN DLY DUCK
GAIN GAIN FILT FBS DYN DYN DLY DUCK
Inputs
FILT DYN GAIN LOUD
FILT DYN GAIN LOUD
FILT DYN GAIN LOUD
FILT DYN GAIN LOUD
Virtual Bus Send Mix-points
(from Mic/Line Inputs)
Virtual Bus Send Mix-points
(from Virtual Bus Returns)
Secondary Mix
Matrix
Figure 44. Secondary Mix Matrix
DMP 64 • Software Control 67