It is indeed there in the as-usual excellent manual:
"The ADI-2 DAC processes all audio in the digital domain. Having only one stereo digital to analog converter, different settings of volume, equalizer or effects for the three outputs is not possible when used simultaneously (the ADI-2 Pro has two DACs, therefore can process two stereo signals independently with different settings)"
"The rear RCA and XLR outputs and the front outputs Phones and IEM are fed from the same DAC, hence carry the same signal. They all have individual driver stages with different output levels, see next chapters for details"
That said I also have a couple questions:
1. Is it the same DAC chip used, albeit one rather than two?
2. Any chance USB HID volume control function has been added?
3. Regarding the quality of the DA conversion compared to the Pro, the main differences listed on the product page notes would seem to be:
"More relays, a different double symmetrical attenuator circuit and one additional buffer OP amp succeed in less noise and less THD"
"The ADI-2 DAC is the first device in RME's range with SteadyClock FS.... With SteadyClock FS the focus was put on reducing the self jitter of SteadyClock to new lows, by improving its second, analog PLL circuit, and referencing both Direct Digital Synthesis and PLL to a low phase noise quartz crystal."
Any further details or thoughts on how significant these changes are?
PS - Congrats on the the new product, it's an attractive device for those not needing an ADC.