As owner of the FXZ200 and the SZ2000 I mentioned about the sound being similar but the SZ2000 has a bigger soundstage and
the bass eventually tightens up and the treble/mids clear up.
Needs patience and a good amp. I use a Headstage 4G, iBasso PB2 and burnin was done using an
Objective2 paired with a NW-HD5 player and bass heavy tracks.
The FXZ needs the same treatment to get rid of the fatiguing sound as you mention.
I pounded them with bass for over a month before they really opened up.
the bass eventually tightens up and the treble/mids clear up.
Needs patience and a good amp. I use a Headstage 4G, iBasso PB2 and burnin was done using an
Objective2 paired with a NW-HD5 player and bass heavy tracks.
The FXZ needs the same treatment to get rid of the fatiguing sound as you mention.
I pounded them with bass for over a month before they really opened up.