Headphones

Anecdotally, i've found that an elevated 2~3khz combined with a non recessed 5~7k region usually has this effect on me too. Idk clearly some like it given how known the oh1s is in the chifi space

FWIW too it seems that the shrill sound to be a semi common thing in chifi, from the ones i've tried anyway. Pre 2021 tanchjim hana was a notable example of this, or if we go a little pricier, hyla's stuff like the ce5

Ig comes down to genres of music and listening volume too, like how the human brain picks up the vocal region frequencies more and stuff