Like, how? this performance for only 100 bucks? with this beautiful tunning? $160 cheaper than my FH5, and they outperform my FH5? Let's GO! first of all, I will say this is my "best audio purchase I've ever made, for now". I currently have equipment like the mentioned Fiio FH5 which is one of the Fiios's flagship, the mighty Sennheiser HD600, Momentum 2.0 over ear, a Sony and Beyer headphones which models I do not remember. Let's compare the FA1 vs my +250 hours FH5. Comfort: naaa, FA1 are quite superior in comfort, weight, seal, and isolation. The FA1 look and feel ike custom a IEM. The problem with the FH5 is the short nozzle, despite considering them quite comfortable, still.. FA1 is superior in every way. Sound: Mids & high: No fair here, I think the FA1 are better than FH5 in details retrieval {micro details}, clarity, vocals, separation, treble extension. The FA1 has a balanced sound signature while the FH5 has a V-shaped or W-shaped kind of signature. This can qualify as "just own personal taste". Personally, I find the balanced sound of the FA1 way more satisfying to listen to. About the vocals, happens that the vocals of the FH5 are clearly too forward and they can turn very fatiguing after a certain amount of listening, especially females vocals. In that regard, the FA1 vocals are less forward and they really sound very nice, totally non-fatiguing. Bass: This is where I could say the FH5 might be better than the FA1, though I would say the bass between these two are bit different and it could suit to your specific preferences. For example, FH5 bass is punchier, more extended, and it goes deeper; while the FA1 bass is lighter but faster and tighter. I ended up choosing bass preferences depending on which genres you listen to. To me, I would rather choose FA1 bass for Jazz, blues, classical, rock {classical rock rocks with these}. While, FH5 for Hip-hop, electronic music; the FA1 do not perform badly on these genres though. Soundstage: FA1 is noticeably wider to me and has more depth, but I would say they have slightly less height compared to the FH5. Sources: very source dependent too, especially with the low frequency. paired with my OPPO HA2 SE, The bass sounds satisfying on any genre, to the point where i'm not missing the bass response of my FH5. The bass, can also be increased to good satisfying level via EQ. Overall, I consider the FA1 to be a more engaging listening experience, more of an audiophile. The FH5 is not bad either, but now that I have these FA1, I will use FH5 just for work-out. Also, another important thing. Change that default cable, it does not sound as good as the cable that came with the FH5 and less good than my 16 core silver plate cord. To Fiio, my friends, start tunning from this point, building your foundation and future IEMS around this tunning, with some improvement here and there. Pictures coming soon.