I am holding a review unit of the A36HN right now, but reading through all the posts on this thread, I'm afraid I will not be able to scrutinize the player to such intrinsic details. Compared to the A15, the A36 delivers more transparent highs, improved low bass, while the high-bass towards the mids are less muddy. Overall sound staging is also slightly expanded. Based on what I wrote on my blog during my review of ZX100 a few months back, the A36HN appears to have similar audio character except the more pronounced sound staging.