For **** sake. A few pages over a pretty simple thing as I see it.
@Vosya - you don't seem to get that your claim is on par with:
"These 5000$ cables make me hear unicorns crying on rainbows." - and then when someone challenges you - "Buy them and disprove me yourself."
Or, "There is a God, after taking LSD I spoke to him." - then - "Just take LSD and you can check it out for yourself."
People make thousands of claims, from DACs, cables, to everything else. Some are easy to check, some are difficult and time consuming. The point is, you can't shift the burden to others to "disprove" or "check" your claim. If everyone just checked everything we'd all be sitting doing it and nothing else all day. The burden of proof is on the one making the original claim.
1. To show it makes a measurable difference.
Then we can talk about whether it's audible. Obviously, if you're making a claim on audibility and the measurements would require hardware beyond your means - you can still rigorously test audibility. Though, in reality, that should really be done by a third party to remove all bias and possibility of outright lying.
Without any of this, any claim is on par with the ones I gave above (it does not matter if it takes 5 minutes or 5 months and a million $ to test your claim).
@Julf Does it really take multiple pages of the basically the same messages without the argument progressing to realize that the other person has no plans of substantiating anything being said. Moving on seems like the best thing to do.