Speakers that disappear

My choices would be as follows:

1.  Magnepan LRS+

https://www.youtube.com/watch?v=pY-zS4eJogE

https://www.youtube.com/watch?v=lprCVHnMmDg&t=83s

https://www.youtube.com/watch?v=cLdlZ5bJXIY&t=433s

I have these, as well as several Harbeths, and had the LS50's several years ago.  They're all superb - but - I really prefer the LRS+ with the right electronics and set up.  Both these and the Harbeths are very hard to beat - though, I think with the right set up... the LRS+ are about as good as it gets... no matter what speakers you chose.  They are truly "giant killers" for modestly sized rooms and can be easily moved for listening... and out of the way, when not.  

2.  Harbeth P3ESR XD 

https://www.youtube.com/watch?v=ZGnWGMfg08k

https://www.youtube.com/watch?v=up6ZpOGt66E

https://www.youtube.com/watch?v=m9nsm8ghU7o

https://www.youtube.com/watch?v=9iN2aRmYfsY

The Harbeths would be my close 2nd...

3.  KEF LS50 

https://www.youtube.com/watch?v=uFUGo_zGUgE

https://www.youtube.com/watch?v=6uTT1aYQ0Hs

https://www.youtube.com/watch?v=eXgt8BhqckA

https://www.youtube.com/watch?v=j5UEMS1efys

RE:  the Quad ESL 57's, which are the best sounding speakers ever created (with the right set up) - both the Maggie LRS+ and Harbeth 30.1/2's and 40.2/3's (with the right set up) (which I also have) sound very, very close to the ESL 57's!  All of the Harbeths sound very similar to them.

@terraplane8bob

Absolutely! I have the Orion’s also - "Maggies on Steroids!"

But... the OP seemed to be asking for smaller speakers that "disappear."

And... although I love my Orion’s... they are quite a bit larger and more difficult to manage, than the LRS+ or Harbeths. And... I do believe the LRS+ does a fair job of competing with the Orions... maybe... with the exception of the dynamics and drive of the lower mids and bass and the size of the soundstage.

The LRS+ is just amazing at producing not only the accuracy and transparency of the sound, but also the imaging and soundstage, with those ESL 57 or Harbeth mids - which is all you need for "all things acoustic." If I want a bit more dynamics and drive... I’ll add some Rels to the mix of my LRS+. But for most of my jazz, blues, country and classical - I don’t miss it a bit!

And... the bonus is... the LRS+, which rivals most any other speaker - is only $1,000!