Well, I can say that this custom EQ, while limited, does not appear to distort the sound like some (not all) music players’ EQ does.
I prefer it to the presets because I can see what I’m adjusting. The advantage it has over music app’s EQ (that works) is that it applies to all apps on the device instead of just the music player.
Soundcore’s default tuning has too much recessed mids and boosted bass. The mid frequency values are too far away from neutral. The custom EQ helps to fix this and allows more tweaking than the presets. (I have issue with volume and pain from the signature and personalized EQ. Piano also hurts my ears and is too fatiguing.)
Here are 2 of my settings so far:
100 = -2, 200 = -1, 400 = +3, 800 = +5, 1.6k = +2, 3.2k = +1, 6.4k = +0, 12.8k = +0
for less aggressive tweak and to keep it more similar to the default, so far, I leave everything at 0 and only change 400 = +2, 800 = +3, 1.6k = +1. This seems to push the mids enough without losing too much thump/punch of the lower frequencies, since the Liberty 2 Pro has good balance in this range to begin with.
+/- 6db is enough to play around with imo, and we don’t need to tweak too much on either end since they are within reasonable deviation to begin with, and the bass is quite impressive even though it hurt my ears with their default tuning as the mids were too much recessed.
btw, please share your custom EQ profiles for the liberty 2 pro if you have any. i’m not too creative in my EQ settings.