My 47 year old JBL 4311 speakers. I've auditioned 5 other candidates with no luck.
I'm currently listening to a pair of ATC SCM20 Passives. It's only the second day but so far, I'm not that impressed. When my dealer set them up yesterday, he briefly listened to my JBLs. He knows that's the competition. His jaw briefly dropped and he kind of smiled and said "those sound really good".
If I end up returning them, I don't know what's next. I've heard the ATC 50s and was very impressed, but that's not in my budget right now.