Afraid to say, I think there may be some issue with the Fiio X3's mp3 decoder and Lame encoded mp3s. I'm on FW 1.31 and some of my rather quiet classical tracks exhibit a lot of background noise on the X3. In fact more so than on any of my other DAPs, including my SGS3 smartphone. So, if any of you audiophile folks would care to listen to this test track and tell me what they hear, I'd appreciate it very much. I'm wondering if this will sound similarly noisy on everybody else's X3.
Download links:
file1 file2 file3 (same file, just different locations)
With revealing IEMs like the ER4S, UERM or FI-BA-SS, this mp3 file exhibits horrible background noise if I crank up the volume a bit. Now, you'd probably think these are mp3 compression artifacts, but the same file plays fine on my other DAPs. Moreover, if I decode the same file to WAV or FLAC, it also plays fine on the X3. So I suspect it may possibly be an mp3 decoder issue on the X3.
Thanks in advance to everyone taking the time to test this on their X3!