Thanks for the replies. It's the age old discussion about Harbeth speakers and how much power is required given their relatively low sensitivity. My experience with the Int-25 is that it does check a lot of boxes and perhaps the most important one being able to handle peaks at my average listening levels.
Differently designed amps will have their own character, but I'm wondering if going to separates has a distinct advantage over integrateds in areas that all amps try to achieve like low noise, precise imaging, dynamics, etc. Like you said Geof, integrated amps are great these days. Is it foolish to think I could achieve a significant Wow moment that exceeds the Pass by spending twice the money on separates?