Please Recommend Highly Efficient Floor Standing Non-Horn Speaker Suggestions

+1 Zu Audio - Soul 6

Thank you thus far.  FYI: Amp is MC275 VI.  I have Legacy Focus SEs being driving by MC611s in another system and love them.  Perhaps Legacy Signature but I need a smaller footprint for the speakers I want to drive with the MC275.  Also, my pre-amp is a McIntosh C2700.  Release the anti-McKraken!

Apologize if this is redundant but the threads here all seem to recommend horn speakers for tube amps.

HMMMM maybe there's a reason?

Since no price range was mentioned:
Arion Apollo 105db efficient AMT line array but are 4 ohm. 

Omego Audio in Ct . 

Strictly speaking “highly efficient” means more than 100dB sensitivity, and there’s no way around that sans horns - indeed we’d be in all-horn territory here. If the 90-95dB sensitivity range will suffice - that is, it seems it must - that are some options. Have you considered Daedalus Audio?