tawmizzzz
1000+ Head-Fier
That's also how I heard the Mason FS with my brief time with it. The dryness & lack of upper-mids contrasted by the 6k peak/tuning just was not engaging versus the much warmer Traillii. Bass was also less realistic. The mass you describe was definitely my favorite part of it, where you get a real solid note/vocal/instrument rounded heft due to the BCD without occupying a lot of space on the stage due to a "hollow" interior.I compared Traillii. Of course, not from the limited Mason FS, but from the more civilian Fusang. For accuracy - on the same cable and the same tips. And sources, of course.
Mason is inferior in naturalness. They look like images with added contrast, less dynamic range. As well as excessive mass.
Sometimes it sounds not that slow, but. First, the sound lacks integrity.
And I don't mean the macro component. Namely the tuning. That is, the bass is somewhat separate from the rest of the sound. The general tuning is detailed and technical, maybe even a little dry. On the other hand, the bass is more massive and has a little fat and warmth against the rest. Effect? Yes of course. Realistic?
Well, I'm not sure. In my opinion, not very much.
That being said, FS is a lot more source-dependent than the bird is, and it seems the Red Halo is a slight improvement which I haven't heard so cannot comment there. Outside of the bass and lower-mids (mainly because of the BAs), Traillii still is king of naturalness/timbre to my ears in the mids and treble. It just doesn't get much ear time anymore due to my desktop rabbit hole .