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8 | Instruments (Display Modes) | 8.7 | The DOWNMIX Instrument EN-64 SurroundMonitor 11900 Series
8.7.2 | Background – the Downmix Matrix
The downmix Matrix
A stereo-compatible 2-channel signal is downmixed from the
surround channels using adjustable factors. In 5.1 format the
surround channels LS and RS are output to the left and right
channels, and the Center channel is mixed into both channels
with the same level on each side. It is advisable to apply an at-
tenuation of 3 dB for the Center channel.
The Downmix signals are available as
Downmix Direct Out
signals (
dlo
,
dRo
and
dMo
) on the digital outputs. The
necessary settings are made in the
Input/Output Routing
menus.
Downmix in 6.1 and 7.1 Surround Format
The total number of input and output channels is limited to 8
per domain or group. Because of this there are a number of
points you need to observe in connection with the downmix for
6.1 and 7.1 formats (see the section below for details).
The lext/Rext channels
The
lext/Rext
channels cannot be used in parallel with all
surround formats.
Since eight channels are available in each domain, in 5.1 for-
mat the unit can manage the six surround channels and the
two additional channels internally as a group. However, since
the 6.1 and 7.1 formats require seven and eight inputs, res-
pectively, it is not possible to conἀgure external channels in the
same channel group.
The lo/Ro channels
The internal channels
lo/Ro
are generated in the internal
downmix matrix to provide a two-channel mix of the original
surround signal. These channels can be displayed in a separa-
te instrument (the
downmix
Meter) in window 3. The levels of
the
lo/Ro
channels can be displayed in the
Program Meter
.
With the downmix matrix activated, these channels can be rou-
ted to the outputs as
dlo/dRo ( Direct Out ).
Routing configuration
The routing settings described above can be configured with
the
Input Routing and Digital Output Routing buttons in
the
Input/Output Routing
menus. All routing settings can be
configured independently for each surround format.