Please Recommend Highly Efficient Floor Standing Non-Horn Speaker Suggestions

Thank you for the video links. I have pair of the Decware HDT speakers. I have ordered a pair of the Lii silver 8’s and will put them into the HDT’S. An inexpensive approach to try out the Lii drivers.

Here is an Decware Lii Audio Silver-10 review 

https://www.youtube.com/watch?v=nKcfGAnGGqw&t

Tekton Lores.  I just acquired a pair for $500 local to me.  Detailed and musical.   They sound full bodied even at low volume.    

 You have to listen Bache Audio-002 , i am in  Brooklyn, i can offer 2 weeks trial listening time with no any obligation 

I recommend Nola Contender 3 floorstanding speakers or the upgraded S3.  I have the Nola Boxers, which are the smaller 2-way bookshelf, and think they're voiced really well and sound wonderful.  The Contender is 90db sensitivity at 8ohms impedance.  Should be easy to drive with your MC275. Good luck in your search.