I think this phenomenon, such that it exists, is wrongly attributed to speakers in many cases. When I have had 'Aha!' moments, they have been in situations where the source was very clean, the amplifier was very clean, the noise floor in the room was very low, the room was smartly treated, the content was dynamic, and the speakers were... a little above average. Low distortion, high dynamic range, low noise floor, and competent speakers seems to be the formula on the positive side of this coin.
On the negative side, as I mentioned before, hearing things I have never heard before often means the speakers are doing something they should not. I consider it a red flag that makes me want to explore why. I usually find the answer in the PIR / LW or distortion measurements.