Stuffed AKG pads sounds amazing with these S400s, not so much with the S500s but it still sound wonderful in their own way, just not enough bass when the AKG pads are used with the S500s. But for folks that want a "flat" balanced sound with tight/ lean bass on their S500s man these AKG pads are crazy HD and fast. Pad tuning never sounded so good and easy on both of these JVCs but you just have to know your sound preference.
@rick, glad that you are hearing what i am hearing on these stuff pad/ tape mods. It is subtle in sound change but makes a pretty big difference for me in the overall enjoyment of these CNT cans.