User's Manual

User’s Guide ADI-2 Pro FS – v 2.5
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15.3 State Overview
The State Overview screen is a typical RME feature. Since 20 years we prefer to give our cus-
tomers more information at hand than just ‘something there’. The Settings dialogs of our audio
interfaces include detailed Input Status analysis to simplify setup and ease trouble-shooting.
Additionally RME provides a free tool with any audio interface, DIGICheck, which analyzes lev-
els, Channel Status and bit stream content, the true hardware sample rate and much more.
When the ADI-2 Pro is connected but no sound can be
heard then RME’s analysis tools come to the rescue. The
State Overview screen is there to track down the problem in
an easy to understand and efficient way. Although it might
look simple (fully intentional!), it includes detailed analysis
that outperforms any other similar device.
Shown are the current states of the digital inputs SPDIF
optical and coaxial, AES, USB connection and the audio
transmitted, and the SRC. The current Clock source is
mentioned in full length, although this information is found
abbreviated in the status bar at the bottom.
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.