When was the first time that you heard great sounding speakers?

For me it was 1977 at Purchase Radio in Buffalo NY. My brother and I were putting together a system that we would share at our parents house. The song was Aja by Steely Dan on a pair of Altec 19's that blew my mind at the time, I'll never forget it. They were a little out of our price range at the time. The system ended up being a Sherwood receiver, KLH speakers, a Technics SL-1950 and a cassette deck that I can't remember the make. Great memory! 
" Arnie Nudell and his Servo Statik 1 at CES. "

The Servo Statik 1A at Arnie's favorite dealer, Woodland Stereo. The model 1s were taken down and the 1As were being run hard and the weaknesses unveiled. Still sounded great.
1969, Acoustic Research 3As driven by Dynaco ST-70. Was hooked on audio since. 
@jafant I really liked soundscape. I remember demoing some totems there, although I think I bought them from the listening room later.
freshman hs, I think. First time I ditched the afternoon classes and got high with the ‘cool kids’ it was a clock radio and baba o’reilley had just come out and was playing. I’ve been chasing that magic ever since and I gotta say at this point I think smokin weed would be cheaper than all the equipment.
I became hooked on audio during the early seventies at college, smoking pot and listening to friends rigs.  I’m sure many were the big Advents.  Later around 1978 I auditioned a number of speakers at Moe’s Sight and Sound in Casper, Wyoming. Can’t remember what they all were.  I purchased JBL 65s and a McIntosh MA 6100 integrated.  Still using both in a second and third system.  They have traveled with me to Alaska, Dallas, China and back.  What a great ride it has been.