Slaphead
500+ Head-Fier
Can the lineout be fixed or variable for RCA/XLR outputs? Looking to see if I can use the volume control on the RME to drive my power amp.
Yes you can, in fact the ADI-2 Pro, on which the ADI-2 DAC is heavily based, was designed to do exactly that, but with powered audio monitors, which are essentially power amps built into speakers, so no problems. That's exactly how I use mine.
By definition line out is fixed. RME has line out mode and variable output mode.
Yes you can do that but it is a really terrible idea unless you really mean power amp without a volume control.
The definition of a power amp is an amp without a volume control, and the RME ADI-2 is an excellent digital source pre-amp if one should choose to use it in that manner.