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

Recently my local audio dealer who is into vintage audio suggested I add a high efficiency speaker to my stable. I have a pair of Martin logan Summits and a pair of Green Mountain Audio C-3 HX .
He suggested looking at Klipsch heritage.  I picked up a pair of Chorus II from craigslist... 101 dB efficient....Boy are these fun... Are they perfect..no.  I noticed Danny Richie over at GR Reasearch recently did a significant mod to a pair of Klipsch Forte 3. You can see all the details over at audiocircle..  I am giving serious consideration to seeing how far I can reasonably take them with performance mods (crossover, cabinet bracing, etc).. These are party speakers that can rock out

2 Jensen Imperial Horns, 1 Jensen Imperial Sub. 1970, Made them from plans, a local cabinet maker had. He had 4 stacks of 1" marine plywood.
He cut the boards and sold them as kits or he'd put them together for a pretty stiff price.

Took most of my earning for a year, to buy the raw drivers, 3 Mac 30 Kits and traded an old HD 45 flathead that ran really good (when it ran), for a C11. It took a 1951 chevy 1/2 ton, two trips to move that system. LOL

A guy sold me a Thoren TD121 he brought back from oversees for 80.00 and a tune up on his Buick Skylark.  

Man oh Man I was a 16 year old kid with a really cool stereo. Loved that system. 2 car garage EMPTY to fit those in. 35 or so speaker builds later, still love to whip up a pair of what ever I can dream up. Have speakers changed that much since then. LOL They took 7 sheets of 1" plywood, to build 3 speakers cabinets, you tell me.

Regard

Paragon Acoustic Regent

Read about them when they first came out but no dealers in my area. Years later and very early in my days here I came across a pair in Connecticut several years after Paragon closed shop. Drove 10 hours round trip to pick them up. Of the more than 50 pairs of speakers I’ve had through here the Regents are the ones I miss the most. I logged more listening hours in succession with the Regents than any others. They made incredible music at all times and never fatigued me in the least no matter what front end I put together. Fun, musical, expressive, engaging....so many boxes checked who could ask for more. (This dummy)
Most stupid sale I feel I ever made. They are so rare and incredibly musical that to this day I can’t believe I let them go. Guess the merry-go-round made me think that there was so much more to experience.....

there’s a pic of them in my Evolution in progress system.  

I wonder if these speakers were more about being at the right place at the right time.  I also wonder if they’d still fulfill today, or if everyones expectations have continued to go up and up.  If they would still be “the most fun” why have something else?  It’s like saying “those $100 cerwin vegas were amazing; I wish these $7000 personas brought me as much joy”

for me the JBL 4333A... everything sounds very pleasant with great bass and smooth... I just keep looking what to play next!