Try measuring the volume output of your two cables. In my experience - and especially with headphones - acrual sound changes more often than not are because of a difference in impedance. One will be slightly louder than the other because of the change. It might only be 1dB. We hear louder as better. Often the difference in cables (apart from the aesthetics) can be negated simply by volume matching properly
The good thing is - this can save you a lot of money in the long run.
I do buy cables - but only to change flexibility, connection type etc. never for sonic differences (unless you are talking multiple-BA IEMs where occasionally a cable change can affect frequency response)
Thanks for the tip.
The weird thing is that the thing that changed made it much worse... I don't wanna name names, but it was an expensive cable and I basically can't use it, because it really screws with some part of the treble which makes the soundstage sound really strange and artificial.
I didn't do an A/B thing, but whenever I try it - and I tried it again just a few days back - I can last for maybe 10 minutes before I have to switch back....
I can't explain it, but... even my wife can hear it.... she noticed it without me pointing it out to her, and she swears she can't hear these sorts of things... probably just to not have to talk to me about it