FiiO Willson,
Thank you for your response. I really appreciate that a company representative is participating in the discussion and trying to help resolve the issues. Despite the small drawbacks, DM13 is truly the high-quality product that I have been waiting for many years.- I cannot confirm this, as my player originally came with firmware V22, but it worked much worse than V25. I do not know how firmware V23 and V24 performed. If you could provide a download link for these firmware versions, I would be happy to test them. I didn't know that downgrading to a previous firmware version was possible; this is really good news.
- Actually, the music always starts playing immediately when I press the play button in all cases. However, if I press pause and leave it in pause mode for a few minutes, the disc stops spinning (probably to save energy). After the disc stops, I press play again - playback starts instantly, but the disc starts spinning about 5 seconds after the music has already started playing. Therefore, I concluded that a 5-second buffer was implemented in ESP OFF mode.
FYI: Here are detailed measurements and descriptions of another kind of issues of the DM13 I found on the internet. They might be interesting for Fiio:
https://www.audiosciencereview.com/forum/index.php?threads/fiio-dm13-portable-cd-player.60621/
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