General; System Requirements; Setup; Supported Inputs And Outputs - RME Audio ADI-2 Pro User Manual

29. General

The ADI-2 Pro operates in Class Compliant mode (UAC 2.0), a standard that is natively sup-
ported by operating systems like iOS, Mac OS X and Linux. No proprietary drivers are required,
the device will be directly recognized.
The ADI-2 Pro provides iOS devices with the professional analog I/O connections they lack.
Professional balanced and unbalanced line inputs and outputs, two Extreme Power headphone
outputs that excel with both high and low impedance headphones, extensive gain and level
adjustments, AES, SPDIF and ADAT I/O connectivity, PCM record / playback at up to 768 kHz,
and DSD record/playback at up to 11.2 MHz (DSD256).
The ADI-2 Pro does not supply power to the iPad/iPhone. The latest Lightning to USB 3 Cam-
era adapter from Apple includes a Lightning socket to connect the standard Apple power sup-
ply, allowing to charge the i-device while it operates in Class Compliant mode with the ADI-2
Pro.
30. System requirements for iOS Operation
•
Any Apple iPad with at least iOS 5 or an iPhone with at least iOS 7
•
Apple iPad Camera Connection Kit or Lightning to USB adapter

31. Setup

Connect the USB cable to the Camera Connection Kit/Lightning adapter. Start the i-device and
plug the Kit/adapter into the i-device's socket. If everything works as expected, the unit will be
used for all audio I/O. Audio playback in iTunes will automatically be performed by the ADI-2
Pro, using analog outputs 1/2 and 3/4.
Note: The i-device's volume control is inactive during USB operation.

32. Supported Inputs and Outputs

When connected to an iPad, the analog input 1 works with mono apps, inputs 1 and 2 with ste-
reo apps (both dual mono and stereo), and up to 6 inputs with multi-channel applications like
MultiTrack DAW and Music Studio. Garage Band supports all 6 inputs, but only two at a time.
Auria and Cubasis can record all 6 inputs simultaneously.
Playback will use analog outputs 1 and 2, or even more channels if the app supports such op-
eration, like Auria and Cubasis, which allow to use all 8 output channels when the device has
been set to CC-mode Multi-channel.
In Class Compliant mode the default clock mode is Internal, and iOS typically sets 96 kHz. Any
app can change / set the sample rate to a desired value, but not all apps include a choice to
select one. Setting the ADI-2 Pro (and with it the i-device) to slave mode by selecting the AES
or SPDIF input as clock source, the ADI-2 Pro will be synchronized to the external digital sam-
ple rate. With a wrong external sample rate heavy audio noise will occur (use of the SRC will
help in specific cases). Without an external signal the ADI-2 Pro changes to its internal clock,
with the sample rate set by iOS or the app in use.
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User's Guide ADI-2 Pro © RME