I think the 24/88 or 24/96 properly converted flac files are the most optimal for listening with HM901.
As for the dff noise: I tried about 30 isos, some are more noisy, some less ...
I think the 901 is a great pair for the 13Pro. Though I'd ask, when do you use a DAP, while moving about or when you've stopped somewhere and need to listen to something then and there? IMO the 901 gets too hot to handle while moving about, which is why I went with the ZX1 for moving about.
I also have no issue carrying it in my pants pocket, it is not as big when you think about how big the sound it can produce
Thanks for the advice. This is more or less what I do already. But what I need is "album playlists". I buy many new albums each month and cue them in a playlist to remember to listen to the new ones, and in a certain order. So on the 901, I just append number before the albums in want in the list, and use folder view. However, it is quite a bother to manipulate, because I have 125 albums in the "to listen" list. I make it simpler by using a bulk renaming program, but still....I wish I could use playlist with MediaMonkey, like I did on the DX100 and AK120.
We totally agree that playlist support would be super nice to have.
I'd also like it to read embedded cover art. Now it only reads embedded covers from mp3 files, so I have to use folder navigation for it to show cover art since practically all my files are FLAC.
And as it is now albums with various artists are shown as one album per artist. I have one 6CD album with about one hundred different artists ... Scrolling through that using tag browsing is simply out of the question. So - at the moment tag browsing is simply not usable IMO.
All this adds to my conclusion that folder browsing is the only working way to navigate through the music, unfortunately.
I do that all the time and don't notice a difference in the 5-6Hr battery life either running SE or Balanced.
FYI typical battery life with my amp cards I experienced:
Balanced - 5.5hr
Discrete - 7hr
Angel - 8hr
Minibox - 8hr
IEM - 9hr
Classic - 10hr
Old stock (8397 card) - 11 hr
Note these are NOT battery TEST numbers but just real life usage experience with various bit rate, file types, screen/UI usage etc.