Well yes that's the thing, I'm a very new guy to this scene, so for example I used apo autoEQ on my GFs shitty mpow M30 earbuds to try and see the changes, and i noticed almost no difference for some reason except on the lack of base, however when I tried the same thing with wavelet autoEQ on Android it sounded massively different, and i took a bit to get used to the lack of bass in the Harmon target compared to the V shaped tuning of those earbuds, but now everything is more clear and balanced which I prefer (tho on PC with apo and peaces it doesn't seem to Change much).

However this is crappy earbuds we are talking about, i have no idea how the Soundcore personal EQ changes things, and if it's something comparable to the Harmon target tuning. I imagine both are just EQs replicable with a parametric EQ and a lot of trial and error, but i truly don't know