This Might Not Exist, Any reasonably priced, smaller speakers with 100db Sensitivity?

 Good quality speakers  to meet the  100 db , small and budget ??   If you get above mention speakers , you need extra subwoofer

The 3.5 watts I mentioned was hardly from a lousy amp. I was referring to the outstanding Triode Audio Labs creations. 

Closest to what you’re describing. 3.5w goes much further than you might think…

https://www.zuaudio.com/loudspeakers/p/mb1

Quality sensitive speaker at a low price = Tekton.  

Polycell 15 is 103 dB.

Perfect SET is 98 dB (there are two versions)  It should be fine and I have a friend whose pair sounds great.

I have successfully driven Encores (96dB) with a 2 wpc Decware EL84UFO.

Some people don't like the looks.  Also some jump to conclusions that these speakers ahe a huge array of tweeters.  They have one tweeter.  An array of the same small drivers is also used as a midrange.

Jerry

Thanks Jerry, real life experience of what truly works is valuable. I say that because a friend of mine tried 4.5 wpc into a speaker rated at 98db sensitivity and it couldn't drive it at more than a very polite conversation level, max. It too 15wpc for it to work well.