The New Amati G5 or Joseph Audio Pearl Graphene

Good contribution!

I've heard the Perspectives a few times on giant SimAudio monoblocks, so plenty of power.  And I did notice a bit more solidity to the sound.   Less body in terms of richness and roundness vs tubes, but more focused and a sense of solidity.

It still didn't give the Perspectives the type of richness and body in the upper frequencies as, say, the wider baffle speakers like the Devore O series.  But it did help somewhat.

The Joseph speakers are touted as tube friendly, at least in terms of impedance, but they seem to appreciate power too.

My experience with Mac/SF is totally opposite to two opinions posted here. I drive my Serafinos with Devialet 440 Pro and they sounded awesome. Moved on to Mac 611 monoblocks and C2700 pre, and they sounded significantly better. Upgraded C2700 to C12000 and Serafinos sound magical. Not sure what electronics from Mac was used when auditioning for the two members here, but I would not characterize my setup as lacking detail whatsoever. To me the combo of Mac/SF is a match made in heaven. 

This is an interesting read through. I have the McIntosh 901 amplifiers and it provides an opportunity to adjust the upper and lower range drivers to adjust for all the things I've read above. Plus it balances the tubes with the solid state amplifiers which is more ideal way for listening .