What is the most FUN pair of speakers you've ever had and why?

It's a tie between my stacked Advents and a pair of JBL L110s that addressed everything I hated about the bloated and harsh L100. The Advnts were big and neutral, very forgiving with bass forever, but ultimately the 'restrained' high end made me want more, but i did more than a little "One more cut" listening on them. The JBLs were the first computer-aligned Thiele-Small design JBL ever did, along with their first soft dome tweeter. They nailed it. Absolutely accurate, non-fatiguing, great imaging, tight extended bass, and of course, JBL quality cabinetry. Drove them with an extremely underrated Marantz 3250 preamp and 170DC MOSFET 85w/ch stack with the matching tuner that had a real oscilloscope built in. Should have never sold that rig, but a new wife and a move ... and you all know the rest.

Probably replied a few years ago, but would have to be my HPM 100's. They survived quite a few parties. Bought them when they first came out, I'd guess around 1979.

I bought the original first version DCM Time Windows speakers when they came out in the late 70's, for $660.  I live in southeastern Michigan, not far from Ann Arbor, where DCM was located.  They were driven by a Kenwood KA-9100 integrated amp, and I have many great memories of how good sounding the DCM Time Windows were.  Unfortunately, the system was stolen from my house about 5 years later. 

Around 2008, I happened upon a mint pair of the first version DCM Time Windows selling nearby me, and bought them for nostalgia reasons.  I then sold them a year later to my brother, and he is still using them to this day, sounding very musical in his furnished basement.