Sonic Defender
Headphoneus Supremus
Seriously ? There are changes, but it is only preferences to what signature you like rather than improvements or degradations: wider seems more forgiving, bass is with more extensions, longer decay..etc...and the rest does the same. Narrower tighten things up but still carry the energies of each tonal beat is packed, hence leaving more air, better separations, better clarity, sharper trebles body but smooth...etc...vocal comes more foward.
I feel like if I want to analyze things then going for narrower, for better musical experiences = going for wider
I'll try again, but I didn't hear anything change. I'm starting to think either I have under-sensitive hearing, or lack the skills to analyze music, or people really do convince themselves they hear something. Either are perfectly plausible explanations. Now I didn't drag the slider all the way over full narrow, somewhere in-between the normal and narrow points. Still, I heard nothing change at all.