This is a flat BA model with a warmer sound.
The flatness does not make the earphones uninteresting, but rather makes them suitable for listening.
It is difficult to describe the characteristics in one word, but if I had to lay it down, I would say
I think it is the power of bone conduction + natural sound.
Is the low frequency really BA? I don't think there is a lack of bass.
The bass is tight, punchy, deep and core.
The bone conduction enriches the bass and makes it realistic and accurate, quickly and accurately reproducing the sound of a drum kick or even the subtle sound of a snare strike.
The sub-bass is easy to hear and the low midrange is slightly emphasized.
Vocals are in front of the bass and have very good separation from the instruments.
It was as if the artist was singing right in front of me. The vocals were so clear and transparent that it was almost as if the artist was singing right next to me.
I can't write about this in a way that sounds clear and transparent
I don't have the vocabulary to write analytically, so I can't describe it well myself.
It is very smooth, but it is not adjusted in a way that makes it sound like a fish cake, but rather it seems to bring the artist's voice naturally to the ear.
The guitar is wonderfully expressive, and the sound of the strings as the guitar is plucked is expressed right down to the end of the plucking.
The solo part is very pleasing.
High frequency range
I have heard nothing but praise for the FS so far, but the weak point of the FS is the high frequency range. The weak point of the FS is the high frequencies.
The high frequencies are not piercing, and for earphone users who suffer from grinding sound, this will solve all your problems. (But be careful, as it may well be an individual difference.)
This high-frequency presentation is brilliant, but it is not so sparkling that it could be perceived as tasteless.
It is possible that you may find it tasteless.
However, the fine grain of the hi-hats is quick and precise, and the highest notes of the vocals are nicely extended.
The highest notes of the vocals seemed to be extended and dispersed beautifully.
This expressiveness gave me goosebumps.
If you like this high-frequency expressiveness, I found the Mason FS to be a great listening earphone.