Best 40 to 50k used speakers

@gosta ATC is damn good with Spectral pre-power.

@8th-note , I just saw a pair of used MBL 101 for only about $15k in Sweden. Might be a little older model but the price seems very good.

And I agree that the MBL 101 are great speakers and probably a good buy used even for $35k.

Otherwise I might look for used Focal Utopia or Stenheims.

@thieliste I am not a Vandersteen fan boy but I do currently own the  Vandersteen 5As.  I purchased mine for cheap so at my price I do not think there are many speakers that can compete.  I did get a chance to hear the Vandersteen Sevens from the person I purchased my 5As.  I did bring my DHT DAC that I design and build with me to hear the 5As.  When we plugged my DAC into the persons system with the Sevens, the sound was fantastic.  I knew what speaker I would want if I wanted to spend the money.  That would be my reference starting point. Go hear the Sevens and then you will have a starting point to hear other speakers.  Vandersteens have been around a long time and reselling them is no an issue.  You can save a few bucks and buy me a pair also!

Happy Listening. 

TAD Ref 1.  Very versatile speaker.