Best Vintage Speakers?

If you like midrange and imaging, and can forego high volumes and driving bass then it's hard to beat Spica Angelus. You can find them used for under $500 and I would wager that for chamber music they would be impossible to beat.

They are quite tricky to mate with a subwoofer (I tried) but they have very controlled bass so they can be used in very small rooms (if the aesthetics is not a problem).

A great bargain.

All Apogees.

Be very careful on selecting vintage ribbon speakers when they get old. Especially if they came from high humidity environment.

SANSUI SP-200 and SANSUI SP-2000 - BOTH are amazing alternatives to Advents and ARs. Maybe not the best but certainly excellent performers- huge sound, reliable and good bargains

IME, Altec Seville 847a. Excellent nearfield and midfield, decent bass to about 40hz with tones, on music it's represented as lean. Highly dynamic, they really get into overdriven guitars such as those found on CCRevisited's live album. Rock and Classical both shine, as does everything in between. Incredible detail. Available from $200 to $800.