Smallest Bookshelf Speaker Worth Listening To


Does anyone have any opinions on the smallest bookshelf speaker worth listening to> I found the Kans to be quite good in a bookshelf system, but wonder if there are others that are even smaller in size. I remember some years back being taken by the small size of the Acarian Alon Petites and they sounded great in a full blown setup. So what is out there today?
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Spendor S3/5 $900/pr. and ATC SCM 7 $1100/pr. The ATCs are very dynamic and open.
Spendor S3/5 - Audio Physic Anniversary Step - Aerial Acoustics Model 5.

All VERY small, relatively affordable (especially used) and incredibly musical.
I've mentioned the Sequerra Pyramid MET-7 monitors before on this forum, and I think they are among the finest small speakers ever made. Richard Sequerra is, of course, one of the great designers in high-end audio, probably best known for his Sequerra tuner. The current version of the speaker is the 7.7, and it's an outstanding performer.