Low power tube amp for Sonus Faber?

specs on your speakers 91db SPL (2.83 V/1m) 4 ohm load
i am using the mastersound compact 845 on a pair of rosso fiorentino volterra speakers
with specs 87db spl (25.83v/1m)  6 ohm  3 ohm min.
my room is 12"x15"x8"  i get plenty of volume.
the mastersounds have great transformers.

ei001h
Low power tube amp for Sonus Faber?
Mastersound 845 compact for my SF Elipsa SE.
It uses 2 845 Valves, single ended at 30W per Channel

https://www.stereophile.com/images/archivesart/1207SFEfig01.jpg
" the speaker is still a demanding load for the partnering amplifier, with an impedance magnitude that drops to 2.5 ohms throughout the upper bass (fig.1). There is also a punishing combination of 4 ohms magnitude and –50 ° electrical phase angle at 70Hz that will suck gobs of current from the amplifier".


No No and No, from 70hz through to 180hz the bass power region you need an amp with current, at 70hz especially it could be lower than 2ohms EPDR as seen by the amp.

They will work and sound ok, but the bass will be nothing like it could be.

Cheers George

maybe look at the mastersound evolution 845 amp.

 The Sonus Faber Elipsa can sound beguiling with a tube amp. I own a pair of the Elipsa SE and drive them with an Audio Research Ref 110. They need high quality power to sound their best. A 100 wpc tube amp is about the lowest I would go. Without enough power, the bass will not be as crisp and well defined. Also it may impact the soundstage and they may sound a little closed in. The only way to know for sure is to hear the amp in your system. With the right amp and preamp these speakers sound amazing. Good luck!

My options are 845 compact or mc275. 845 evolution is not an option for me. 

I think MS is more high end than mc 275 (is this accurate ?) and I’m trying to stay away from Mcintosh. I’m currently using mc452 and c2600. 

@mboldda1 

how is your low end bass performance? 

@georgehifi 

I’m  not sure how to interpret those numbers. Also have an option to get an older Krell ksa300s, not sure if it’s superior to my Mc452. What do you think ? My plan is to have one SS and one tube for Elipsa.