I have done the test repeatedly and absolutely can't hear a difference unless there is an error on the copy that makes it clearly audible. Have performed the test on apparently good copies and both myself and a friend I listen with regularly, couldn't hear a difference. We have done blind tests on numerous occasions, the results are always the same. I don't even pretend that I can hear differences because I hear none. Those that can hear a difference would have to prove it to me. Not that I really care other than I have a difficult time imagining it. I say if you can REALLY hear a difference of a good copy from the original you have better ears than I do.