After dozens of hours in my ears, using my Sony ZX300 & an aftermarket cable (
https://fr.aliexpress.com/item/NICE...108.1000016.1.78afd0bd59Utnk&isOrigTitle=true) I can say few words about the S8F I have.
First, they are very well built. It looks like a premium product , no doubt.
Shells are very ergonomics, I believe most of the users will have a good fit with these S8F. For me, having pretty small ears, the comfort is ok but I feel some pressure on my concha after a while.
Talking about the sound, I have the best results with Spiral dots tips.
In general I would say these S8F are very detailed , always very clear, engaging most probably because transitions are very fast.
Very high quality bass, tight with a lot of impact when needed. Decay is short as expected from a BA bass (but I like that personally). I feel mid bass could be elevated by few DB (like 2dB) to give more body to the message though.
Low mids are slightly recessed and fall short versus high mids which are (a bit too) forward. Out of the box high mids were too elevated and too "shooty" (2/4 khz zone) . I'm not a burning believer but I have the impression that high mids are getting better, more controlled I would say.
Still some voices or instruments can be a bit aggressive and unnatural depending on the recording but that can be easily fixed with EQ (see below)
Highs are detailed and not aggressive.
Separation is really great , it is very easy to locate all the different instruments in the mix. It never never feels congested!
Soundstage is average I would say, a bit narrow but the depth is ok, I don't think this is a strength of these S8f. But again I don't mind, I don't need a super large stage to be honest.
To summarize I'll say : clear, vivid, engaging, but sometimes a bit lean or unnatural without EQ.
For instance, I use 10 bands EQ of my ZX300 to reduce high mids a bit (2dB at 2 & 4khz) to get a more natural sound and I will never go back to "direct sound".
Compared to my Andromeda, the Greens are surprisingly less clear but also more natural, slightly warmer than S8F. Instead of having a peak in 2/4Khz like the S8F, it is more in the highs but I was no issue with that. I have never EQ'ed my Andromeda for instance (but now I clearly hear the peak in highs compared to S8F)
Soundstage of Andromeda is better, timbres as well. They sound more realistic to me. But again using a bit of EQ I feel these S8f are playing in the same ballpark (but still a bit different).
Overall, Andromeda remain my favorite of the 2 but again what Fearless did with these S8F is a really great accomplishment!
I know how bad memory is when it comes to compare IEMs but these S8F kind of remind me Jomo's house sound with their Samba/Flamenco