Please Recommend Highly Efficient Floor Standing Non-Horn Speaker Suggestions

+1 Zu. I have has Zu Def 4s for many years. I drive them with an 300b SET amp.

I've not heard the Tektons, but am aware they get a lot of (+ & -) talk around here.  So, when I saw a Stereophile review of the DI recently, I skimmed through it.  They did get a good review and I believe made the Recommended Speakers list. 

However, on the test bench their sensitivity was estimated at 87.5db, which is quite a bit lower than claimed.  Perhaps this is one of the reasons there are such varying opinions on these speakers.  If you're buying them because you wish to use a low power amp and need "highly efficient" speakers, you may well be disappointed by what appear to be speakers of average sensitivity.

I have Living-Voice OBX-RW speakers (94db 6-ohm nominal) and have used them with an 18WPC SET amp and First Watt SIT-2 8WPC solid-state amp very effectively ! They sound terrific and play plenty loudly in my modest listening-room.  I also had a Pass-Labs 30.8 stereo amp (30WPC) that would play these speakers very loudly seldom moving the VU-meter.  Highly recommended if you're not wanting to buy horn-speakers...