In addition to the AD stage, the ADI-2 Pro might be better when using the headphone output in balanced mode (more power + additional DAC chip), but we'll have to wait for some direct comparisons to see what the difference is.
No, you can do PRT with any amp so long as you have a balanced connector on the headphone. It's just that if the amp has an unbalanced 1/4" output you start with a 1/4" -> 4 pin XLR adapter before proceeding as usual for the PRT. I do this with the Valhalla 2.
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