As for testing with my Plinius, of course that would be ideal but virtually impossible given the amp is 35 years old and unlikely to be found in any listening room
@aheydorn Is there a Legacy &/ or PSA dealer withing a reasonable distance. You could take your amp to the dealer and try it there. As for the speakers my only input is that I have Silverline Sonatas which are 93.5 db efficient. My Conrad Johnson MF 2500A 250wpc didn't sound as good as my Latino Dyna ST-70 with my Silverlines. Maybe it was the tubes. Maybe 250 wpc is much more power than the efficient speakers need or can use adequately. IOW,itI was not getting the full benefit of the 250 wpc. It overflowed like pouring a gallon of water into a pint jar. It could be that your 175 wpc would make the PSA's sing better because their 87db can use all the goodness from the Plinius. This is a laymen's observation and thoughts about it. Also Maybe Call each manfg and pose the question to them.