Dark Volume - RME Audio ADI-2 Pro User Manual

The status bar always shows the current volume setting of outputs 1/2 and 3/4, the currently
selected output for the Volume knob by a marker around the outputs, the current clock source,
and the current sample rate. In case of Sync problems the sample rate will either fluctuate or be
shown in red – or both. This information is available in nearly all screens, and helps to get a
quick overview of the current state. The State Overview screen now extends this information in
great detail.
The currently selected SPDIF input, manually or automatically, is shown as SP op or SP co
(optical or coaxial). The SYNC column shows No Lock, which equals no signal present, as
And lock and sync, according to the current clock state of the respective input. Note that with
SRC active the respective input will always show lock, not sync, because the phase relation
between internal and external clock has no meaning anymore.
In case of USB conn (connected) is shown as soon as a valid USB connection is established.
The column SR shows the hardware measured sample rate for the SPDIF and AES input. It will
even display values that can not be set at the ADI-2 Pro itself, for example 32, 64 and 128 kHz.
In case of USB the sample rate is not measured but set by the external computer or iOS device,
and can be verified here, up to the highest value of 768 kHz.
The State column shows the Channel Status, Consumer (cons) or Professional (pro), for in-
coming SPDIF and AES signals. In case a DoP (DSD over PCM) header is detected DSD is
shown. With USB the state column shows the current channel mode, 2/2 or 6/8, or DSD if a
DoP header is detected.
The Bit column shows the amount of bits found in the SPDIF and AES audio signal. Note that a
24 bit signal that is shown as 16 bit is indeed 16 bit, but a signal shown as 24 bit might contain
only 16 bit real audio plus 8 bits of noise...
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 Pro 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.
Finally also Emphasis, a special treble boosting equalization method from the early days of
digital audio, is detected and shown as SPDIF WARNING EMPHASIS. See chapter 34.4.
The inclusion of the SRC status helps to find simple errors that can happen due to the many
options of the ADI-2 Pro, 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 readable in bright environments, and
has zero flickering or moving elements (level meters).
Volume and Bass/Treble adjustments happen right in this
screen, which makes its functionality not only visually
pleasing.
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 Pro © RME
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