Great thread!
I took a class at Colorado State University in 1980 called something like "Audio Physics." It focused on teaching physics through the practical application of science through a stereo system. Shortly after the class ended I purchased my first stereo system which included a entry level Luxman 2040 integrated receiver, a Phillips 777 turntable, with a shibata type stylus, a Sony tape deck, and a pair of big speakers.
The speakers actually bugged me and I sold them and purchased a Three D Acoustics pair of satellites with a subwoofer. I knew something was up when a year later I had a local guy (Harms Labs in Fort Collings) build a custom sub for me. (I ran into Steve Harms a few years ago and he was still building and repairing speakers.)
Ten years later, I purchased a used pair of Acoustat 1+1 speakers for $350 from a friend who was disappointed with the bass. I added a Vandersteen sub and the friend couldn't believe how much better they sounded than his expensive new B&W speakers.
The original Three D satellites are part of my 7 point surround system in our small TV room, with a B&W center and four B&W surround and rear speakers built in, plus a small SVS sub. Great for TV.
The Acoustats are thirty plus years and I am researching completing a rebuild on them. They still sound better than almost anything out I have listened too. It helps to have good electronics sending the signal to them. It has been a fun journey.