[classical music lover]

Which brand and model do you like and why?  I am considering Spatial M3 Triode, X2 or PAP Voxitiv or horn speaker.  Heard the Spatials but not heard the PAP's yet.

[Russell Dawkins]

I'd like to hear the PAPs with a Cube Audio driver:
https://www.cubeaudio.eu/

Word is they might better the Voxatif, at least some models.

Here's a translation of a Russian comparison, the only such I've seen. Sorry about the link length:
https://translate.google.com/translate?hl=en&sl=auto&tl=en&u=http%3A%2F%2Fsoundex.ru%2Fforum%2Findex.php%3F%2Ftopic%2F40952-pureaudioproject-open-baffle-speakers-%25D1%2587%25D0%25B5%25D1%2581%25D1%2582%25D0%25BD%25D1%258B%25D0%25B9-%25D0%25B7%25D0%25B2%25D1%2583%25D0%25BA-%25D0%25B1%25D0%25B5%25D0%25B7-%25D0%25BF%25D1%2580%25D0%25B8%25D0%25BA%25D1%2580%25D0%25B0%25D1%2581%2F%26page%3D52

[classical music lover]

Voxativ's pricing starts at about $2500 per pair up to well over $30,000 for their field coil.

[Whitestix]

I have the M4 Triode Masters and they are easily the most enjoyable speakers I have had in 45 years of having great audio gear.  I guess all I can say it that I am an utter and total OB speaker devotee.  They music flows effortlessly from the speakers, they are dynamic and quick, and have a wonderfully large soundstage.  The are quite easy to drive.  Yeah, I love OB speakers for lots of reasons.  I have yet to hear the Pure Audio Project speakers personally, but friends that have heard them speak very favorably about them. 

[classical music lover]

Thanks Whitestix.