Bel Canto E one C5i Integrated Amp power question

My c5i is driving a pair of kef ls50s these days in a large open family room/kitchen area. The ls50s sound glorious and they are not easy speakers to drive. I’ve heard them sound quite bad/flat on other amps with a lot more rated  power than the c5i in that room.

Yes on all the time

The c5i should do a very good job to drive most speakers to reasonable spl but not the last word if you like to listen at more uncomfortable listening levels with less efficient speakers. There is a preamp output on the back so very viable to use it with a beefier power amp if desired.  Little more to want or need ever with that combo. 

Should do fine.  I also have a c5i.