To be clear though, the filter 1 vs 2 is real, effects are measurable, actually measured by them, and Amir. Whether one can hear the difference or not will of course depend, Gene seemed to say it was difficult for him to tell the difference but he did say which one he preferred so I assume he heard difference however subtle it was to him. Archimago's website apparently has some comparison listening test results on different DAC filters as well but I am too lazy to even bother reading those.I hope that Garry found another job where his skills would be put to better use. American and Korean culture are different and not sure Garry passes the test.
I give Marantz engineering the credit for finally used HDAM versions that no longer drops SINAD, so at least their presence don't do any harm, so that's good engineering, and I think the filter options included was a win for the engineers/designers as they can give the "warm" sound vs "more accurate" sound a reason (again, audibility is a different story) whereas in the past they had to @=]&*%$# to make an unwinnable case based on the HDAM buffers only.