People often think treble extension = sparkle, transparent = bright, and resolution = detail, because it's an easy way of analyzing sound that makes sense at face value. But in all three cases it would just mean more treble should equate to better performance, which isn't the case. In fact, while adding a large treble peak might add more clarity, it often decreases the transparency by disrupting the linearity. The Phantom objectively has better extension than 90% of the TOTL iems, and no less than either Zeus or Legend. But in overall treble quantity, it might be too laidback for people that prefer brighter tunings. That is a valid point to raise, as the Phantom won't be to everyone's liking.
Preference for brighter tunings, is perhaps analogous to growing accustomed to a large amount of sugar and salt in your diet. Once you scale the amount back, the food tastes 'bland'. The Phantom was tuned for timbre. Even so, timbre by itself isn't a quality that will appeal to everyone. There are many people that see detail as measure for performance, and the Phantom might indeed not suit them. Unfortunately, you can't have your cake and eat it too.
