hospital grade or commercial grade receptacles ?

first.excuse my grammar because english is not my natural language,but after going through this thread,i couldnt help myself but to jump in and sharea little of my own opinion.I am an EE for HP for the last 15 yrs designing hi-end server micro-processor.i do have my MS in EE,so i do know a bit about electrical signal.when i first start out this hobby,i think it crazy when people can hear the difference in cable and IC,because on theory ,there is no difference,but i have an openmind to keep trying out all diff cables to see if my ear can pick up the differences.Now,3 years has gone by and i still cant hear the difference,but i do not doubt any one who can,because there are more then just a few that swear that they can.I dont think those people are stupid enough to spend thousand of dollars on something that they cant tell the different.what i am trying to say for mr IRV and Eldartford is,comming from the same electronic background like you two,i understand where you are comming from,but dont you think there might be 1 day that technology will come up with something that might be able to measure the differences in cables that only certain person with gifted hearing to pick up those signals??..just my opinion.