There is a word "HuFi" in the Chi-Fi group. In Chinese, "Hu" has the same pronunciation with the word "糊", the latter means muddy and boomy when describing sounds. So "HuFi" refers to warm, bassy monitors with weak resolution. As an example, the curve below is a "HuFi" one.

I ran across this: https://www.audiocircle.com/index.php?topic=159192.0 Which is actually Rtings.com's scheme to measure heapdhone stage. Obviously this is intended to apply to big over the head headphones. Still, I applied this theory to IEMs I've listened to and have graphs available and...