Funny how many people don't consider the source as the most important.
"many people don't consider the source as the most important" because they have very limited control over it
That was something else I wanted to comment on. The music is the most important part. If I just wanted to listen to theoretically perfect sources I could generate some sine waves in Audacity and be done with it.
Also, one needs to draw the OCD line somewhere. Improving your electronics and transducers makes everything sound better.
Even if your preferred genre is classical and you actually have a wide variety recordings, performances, and mixes/masters of each piece to choose from you need to invest a considerable amount of time to improve the quality of that single piece. You need to be pretty hard core for that cost benefit to work out.