I believe it's true as well, that our hearing goes through an adjustment period as well. When I first heard some Paradigm Studio 100s, I felt at first that they were not necessarily bright but I wasn't sure if I could handle the higher frequencies or not. I gave myself some time to get let my ears get accustomed to the music and then started to enjoy them. My guess is simply that I wasn't use to hearing higher freq so clearly before having listened to budget speakers for the most part where those highs were either not there, or were distorted.
For sure, you need some patience with any system to get the best out of it, as I'm sure I will find out soon enough too.

Half of communication is listening. You can't listen with your mouth.