hey hey isn't there some rule about comparing iems to headphone is a total no no??? Seems like that old school mentality is out the window with these micro CTN drivers and 3x dynamics/ multi chambers etc, tech used in IEMs. It is a fair comparison nowadays between the two, just crazy how fast iem tech has evolved.
I think that's why the S500s are still better to me. If only these CKN70s were full sized headphones.. :O After some burn in these might be better, we'll see.