Requesting Your Expertise - Best Options - High Sensitivity Speakers For A Smaller Room

The tough thing with efficient speakers is they tend to be larger. But I would check out Omega and maybe Zu's standmounts. I just ordered a pair of Odeon Midas speakers on closeout but haven't received them yet. They're floorstanders that are 95 db efficient and are not huge and may work for what you're looking for. Not a ton of info on Odeon but they are german and use quality parts throughout. I saw a standmount Odeon for sale too and someone chimed in that it's the best speaker they've owned after owning many top brands. 

I had Omega SAM and while they sounded very good I started to miss not having a tweeter.   They were in my second system which wasn’t tube , it was a 40 watt integrated 

I thought I would rotate them with my Forte IV which I use a few different amps with.   Never got around to that.  I did run them with a few PP tube amps but never my 300b.   The Omega sounded great but fell apart at moderately loud levels.  And that was with several 40 - 50 watt amps. 
 

I sold the Omega and went with a medium efficiency speaker and got a more powerful amp.   For that room it was the right choice.  
 

Unfortunately with a 8 watt Amp you are limited to highly efficient speakers.   I would look at conventional two ways 93 dB send or more in a small room.   Something like a British monitor or Sonus Faber at 86 or so I think will cause any low power amp to run out of steam fast.   You only want to use the first watt or less , if you push a 300b to half power you are really asking a lot of it.  
 

I’m 58 and I hear well enough to really miss a tweeter not being there.  The Omega claim 18 or 20 k but they are really lacking sparkle.    You can’t have everything with a single driver and I’m glad I tried a pair but they ultimately were not for me. 
 

Fritz? High 80s sensitivity offset by easy impedance.