Any LS3/5A type speaker including Harbeth, Spendor, Falcon, Stirling, etc., should fit the bill. I have owned many of that type of speaker and the Harbeth is my keeper. There are many positive reviews and this guy is right on describing the P3!
https://www.youtube.com/watch?v=mqFIaiPT_kY
https://www.youtube.com/watch?v=mqFIaiPT_kY