+1 "Since the effects last, even after the cable is gone, maybe we could buy just one cable and pass it around to all the members?” - LOL
it could be just contact oxidation/dirt cleaning effect during plug-unplug action.. periodical (once in two-three years) maintenance of all critical contacts, by cleaning / checking contacts, is very important! I’ve seen a lot of “new magic cable” SQ improvements discoveries only backed up by the fact that new connector never aligned with old one’s contact point.. in many cases IEC amp/other device receptacle need to be replaced as well, ideally matching new cable plug manufacturers spec.

