I never will understand how they can assemble people in away to discredit those who can hear the obvious.
Today I did a quick A/B of my own useing the hdvd800 with the hd800 headphones . Both we're used with redbook reference tracks is use for the purpose.
a was the above from a surface pro jriver 19.
The B was all the same but using the AP1 /PP.
Wow what a difference , as I listened to it with out the ap1 , I was saying to myself what a lousy dac this is.
But when I switched in the ap 1/PP. I then said wow what good dac. . I think it's mostly jitter that affected the changes in most dacs 2k down. And I find they all sound very good if adding the offramp or audiophileo .
Just my 2 C ,s