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But SPDIF and AES can also transport AC-3 and DTS encoded surround sound. This signal
sounds like chopped noise at full volume. Therefore the ADI-2/4 Pro SE receiver circuit checks
the Non-Audio flag within the Channel Status. If found the signal is already muted directly in the
receiver. An error message is shown in red colour in the lowest line, saying SPDIF NON-AUDIO,
explaining why there is no sound at the analog outputs despite a valid input signal.
Emphasis, a special treble boosting equalization method from the early days of digital audio, is
detected and shown as SPDIF WARNING EMPHASIS. See chapter 34.5.
With Loopback active LOOPBACK is shown in red color in the Analog Input analyser screen, and
here. See chapter 17.4.3.
The inclusion of the SRC status helps to find simple errors that can happen due to the many
options of the ADI-2/4 Pro SE, which naturally reside in different parts of the menu structure. For
example the SRC might be active, but SPDIF signal is dead audio-wise. A quick glance at the
State Overview will reveal that the SRC was set to work on the wrong input (AES)...
15.4 Dark Volume
This screen has been added as alternative to the other meter
screens, which even with the dark theme selected might be
disturbing in some situations. Dark Volume shows the current
volume setting of both analog outputs, their current reference
level setting, the amount of Bass/Treble gain applied, and the
Balanced Phones mode. It is low in brightness, still fully read-
able in bright environments, and has zero flickering or moving
elements (level meters). Volume and Bass/Treble adjust-
ments happen right in this screen, which makes its function-
ality not only visually pleasing.
Despite this screen having no level meters, overloads caused by Volume, PEQ or Bass/Treble
are easy to recognize. The big gain numbers are coupled to the over detection of the analog
outputs. They change their color to red when overload occurs.
As with the other meter screens, once selected it becomes the default screen, automatically
shown after power-up or when leaving a menu.
User's Guide ADI-2/4 Pro SE - v 1.0
36
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