I am sure many of the more senior members of this bunch here recall their younger days and the pivotal experiences in their exposure to new and different ideas that delivered real 'aha' moments. I will share just a couple of them. When I was in college, there was a local audio store not far from where I roomed in my college town that had a fairly progressive staff in terms of the variety and quality of components they offered for sale. I was always seeking out such places and on this particular day, was blessed to discover the new Ohm A loudspeakers being handily driven by a Crown DC300 amplifier. I was experienced enough to recognize the groundbreaking approach to speaker design this represented and the sound quality was unlike anything I had ever heard. Easily eclipsing anything I had heard up to that point. That said, it remains one of the very high points in my journey. The most realistic soundstage and midrange and highs I had ever heard and the bass was really good too. I was truly amazed this inverted cone could reproduce the full frequency range all by itself and do so convincingly well enough I really could close my eyes and believe the band was in the room. Another event was hearing the ESS Heil loudspeakers in my home town at one of the local stores...I just knew the Air Motion Transformers as they were called used in those speakers was no gimmick and that design would go on to be used in some of the best designs ever penned.
Then there was the exposure to solid state amplifiers back in the early days. I grew up hearing hifi as produced on tube equipment and accepted that as state of the art and pretty much believed that Tubes were always going to be how it was done. THen solid state arrived and Dad replaced his old Williamson type tube equipment driving an original AR2 with a pair of AR-3a's driven by a 35 wpc griefkit and I knew that tubes days were done...or soon would be. Wasn't long and then we had the Phase Linear 400 amp and Harmon Kardon's Citation 16. It was about that time I heard a pair of Kilpschorn Corner Horns driven by a Citation 16 - wow! Blew me away! Never had such impactful sound pressure levels except at a subsequent grateful dead concert.