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22. Digital Connections
22.1 AES
The ADI-2/4 Pro SE provides one XLR AES/EBU input and output each via the included breakout
cable when connected to the D-sub 9 pin socket on the back of the unit. Connection is accom-
plished using balanced cables with XLR plugs. Input and Output are transformer-balanced and
ground-free.
Input
The AES input is used when the unit is set to Auto and it is the only digital input signal. In case
USB is active and multi-channel mode has been set, the AES input signal is available as input
channels 3/4 when performing a USB recording. In 2-channel mode AES is only available for the
Phones Out 3/4 by manually selecting this input. Chapter 17 includes more details and block
diagrams for further explanation.
The AES input can be sample rate converted and clock de-coupled by activating the SRC on it.
Output
As can be seen in the block diagrams of chapter 17, in most modes all digital outputs carry the
same signal. The ADI-2/4 Pro SE then operates like a splitter/distributor. The input signal is con-
verted to several digital formats at the same time, and can be used up to three times (AES, SPDIF
coaxial, SPDIF optical or ADAT).
In USB multi-channel mode the AES output becomes playback channels 5/6, see chapter 17.4.
The output signal coding of the ADI-2/4 Pro SE has been implemented according to AES3-1992
Amendment 4:
32 / 44.1 / 48 kHz, 88.2 / 96 kHz, 176.4 / 192 kHz depending on the current sample rate
Audio use
No Copyright, Copy permitted
Format Professional
Category General, Generation not indicated
2-Channel, No Emphasis
Aux Bits Audio use, 24 Bit
Origin: RME
Older AES/EBU (and SPDIF) devices and record media can contain Emphasis information. Audio
signals with Emphasis have a high frequency boost, requiring high frequency attenuation during
playback. When using the ADI-2/4 Pro SE as audio interface to record SPDIF into an audio file,
the emphasis state is lost. See chapter 34.5 for details.
The option Digital Out Source - Line Out (SETUP – Options – Device Mode / DSD) sends the
processed signal Line Out 1/2 also to the digital outputs AES, SPDIF and ADAT, for example to
connect active monitors having digital inputs.
22.2 SPDIF
Input
Two SPDIF inputs are available, optical via TOSLINK and coaxial via the included breakout cable,
but only one can be used at a time. The input is the white RCA connector.
The currently used SPDIF input can be chosen under Setup – Options – SPDIF / Remap Keys –
SPDIF In. Set to Auto the input with a valid input signal will be chosen automatically.
The optical input also understands ADAT format, up to 192 kHz, but only channels 1/2 are avail-
able.
User's Guide ADI-2/4 Pro SE – v 1.0
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