Thanks!
The quizzes do involve dips as well. I'm currently practicing on a pair of old CA Jupiters and I can barely distinguish peaks in the lower frequencies, but I do understand why practicing on one pair of iems will confine my hearing abilities. Would a solution be to either get a pair of "neutral" iems or just switch around between a number of iems?
I'm still learning to audiolize (visualize (?) sound) iem measurements and I'm hoping this is a good stepping stone for that.
I'd probably recommend switching around. That way, you can identify peaks in IEMs that sound like the Jupiter, or dips in ones that sound like the A12t, etc.