What speakers have you mistakenly let go and then later repurchased?

Merlin TSM-mmi.

Kudos cardea C20, really better than my Focal 907be, the SEAS crescendo K2 tweeter is wonderfull compared to Focal béryllium, it's an another world !

Miller Kreisel S1B pair. I found a pair of Satellite 1B decades later, and was surprised how good they are, now that I have a better idea how to integrate them with a subwoofer, and use the variable crossovers to allow for different placements.

The first were AR3a's.  I've now had three separate pairs!  I have owned 2 pairs of JBL L100's.  I wish I'd have kept Totem Sttaf and Platinum Audio Solo's.   I also owned 2 pairs of Solo's.   Regret selling B&W 804 Matrix.  I once put all my audio possessions into a spreadsheet and came out with the same conclusion: 

I'm sick :)      

@rettrussell 

😊