Way to go Danny
People can measure it, listen to it (experience) and come to their own conclusion - instead of concluding - there are no differences in wire, parts etc.
We have a member in our audio society club who says there is no difference in source either - hook an ipod or a high end source ... later he admitted that he can't hear the difference (due to some hearing loss) or that it is not worth the difference in price for him (he is a nice guy though ...)
As you said Danny - he can't hear the difference or he does not care to hear the difference vs. there is no difference ...
Perhaps the verbiage is there may not be significant
differences and every person has their own idea of what significant is from 0% to 100%
Thanks for putting a project together for educating anyone who cares to be illuminated ...