What fundamentals? Far too many and I should know better!
- Buying high end speakers with low end design
- Believing speakers needed to be big
- Believing subs are mainly for movies
- Thinking that my electronics, but mainly my amps were either the problem or the solution
- Accepting at some point that I fundamentally did not understand how what came out of my speakers eventually got to my ears, and what it did when it got there
- Realizing that audio dealers, at least the ones in my area of which there are many, don't know what they are talking about 95% of the time.