Extron electronic Extron Electronics Music Mixer DMP 64 Manuale Utente

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

Virtual Bus Send Mix-points
(from Mic/Line Inputs)

Virtual Bus Send Mix-points
(from Virtual Bus Returns)