After going through this thread, I have a couple of questions:
1. Does the higher current and possibly damping factor only benefit certain speakers and not all speakers? From what little I've read on it, damping factor helps with the amp's "grip" on the speakers, to better control the drivers. And as for current, certain speakers like Maggies seem to thrive on higher current amps, right? But would there be a general, across the board benefit for all speakers? Trying to determine if the differences between the original and new, more powerful Purifi would be worth the move to the newer modules. I have a pair of original purifi module based monoblocks. From what boXem | audio posted earlier, it would seem that only after going lower than 3ohms would there be a benefit.
@Stephen Bayley & others:
2. For those who have the March P501 or P421 (formerly P451 monoblocks, what is the difference you notice with the front power switch vs the original used on P451? It's supposedly not as finicky on the P501/P421?