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"As a computer interface the ADI-2/4 Pro offers a stereo (2 in / 2 out) and a multichannel mode (6 in / 8 out). "
"As a computer interface the ADI-2 Pro EX offers a stereo (2 in / 2 out) and a multichannel mode (6 in / 8 out). "
The RME ADI-Pro units are audio converters that can operate in one of two modes: 2-channel Stereo or Multichannel.
In 2-channel mode — direct pass through or using USB as a 2-channel "AUX send / recieve":
- Input: there is a single 2-channel audio stream (left, right) coming in on only one of (a) the analog input, (b) the S/DIF input, (c) the AES input, or (d) the USB input.
- Output: there is a single 2-channel audio stream (left, right) being sent simultaneously to all of the following: (a) the XLR/TRS/TS analog outputs, (b) the headphone jack(s), (c) the S/PDIF out, (d) the AES out.
- Input: there are 6 simultaneous discrete input channels (3x left, right) from the following: (a) analog input, (b) S/PDIF input, and (c) AES input.
- Output: there are 8 simultaneous discrete output audio streams (4x left, right) sent separately to each of the following: (a) analog out 1/2, (b) analog out 3/4, (c) S/PDIF out, and (d) AES out.
In the case of the ADI-2 Pro 2/4, there are two separate DSP processors so that you can have different parameter settings affect audio output 1/2 vs. audio output 3/4.
The multi-channel mode becomes very valuable for cases where you want to do off-board mixing and audio processing since you can now independently access all of the input channels, mix and process as desired, and then potentially send unique audio to each of the output devices.
The critical factor in the multi-channel mode is that all 6 input channels are routed to an external device via the USB ("aux send", or "play"). That external devices will mix, modify, and then route up to 8 unique audio channels back to the RME via the same USB ("aux receive", or "record"). Thus the 6 input channels sent out the USB, 8 channels back via the USB — completely controlled by that external device.
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