Broquen
100+ Head-Fier
That's very true actually.. And yes it does seem to be more of an effect on DD that BAs.. I have an LZ A4 that has always had a silver plated cable, and recently I switched to copper, and I could hear a difference. Same with my Tin 2.
But yes it is subtle, and it seems like you really need some serious hours on an IEM before you notice the changes, and that's why I just don't think a cable makes enough of a difference in this case.
For me anyway.
I think the filters should do a great job rolling the 2k though.
I have the A4s too and always listened to them with copper cables hahaha. I'll try them with silver copper and mixed, just out of curiosity, because my daily phones are NCM NC5v2 and my brain is used to them, not to the A4s.
On the other hand, if cable does not work for you try dampers and EQ (if needed) as other users recommended you