Current daily drivers. I think they give me the most accurate impression of the audio so far, and while many a time, I get the impression that there is something lacking, over time, I get the impression that these are simply portraying what's in the audio. i.e. far more important than the headphones, is the need for the highest quality set of reference tracks when auditioning. I've abandoned the AutoEQ. Reasoning, my specific copy of the headphone has variations, from the copy measured on any popular database, so any attempt to correct will introduce anomalies. The un-equalised sound is definitely better than any attempt using AutoEQ. Only very slight broad Q EQ, to tune to taste, but predominantly, even this, I avoid. Well produced music - does not need this.
I am shocked that a lot of very popular music, e.g tracks on Adele's 2nd album, have quite a bit of "grunge" on them. At 1st you wonder, this headphone is terrible, but no - it's the music/audio that has these crunchy artefacts. The spacial left to right perception of the stereo field, I think is adequate, and I can hear very well into every track. I'd say maybe these are a bit bright, but when I look at my frequency analyzer, it's the music that's bright. If there is bass bloat, its coming from the music - none in Dr Dre's 2001. Vocals are especially good, easy to hear the diction of rap vocals, which normally on many other headphones is difficult. This alone tells me - something must be right about these headphones - the clarity in the vocals.
So these are telling me - the truth, listen to really well produced music, it sounds great, but it is not forgiving of any grunge in the music. Eminem on the 2001 album - wow so clear. Probably more important is the perception of transients, of drums, voices, instruments, and a very fantastic perception of how much reverb has been added, or not added. The edges of any audio are sharp and distinct, no flob - if the music is tight, what I hear is tight. I think one has to listen to a lot of music - especially well produced music, to form a true impression of any headphone - and this investment takes time.
I like these headphones. If you want more bass - just tap in each ear, just a little bit more into each ear. This is the huge challenge with IEM's - all the impressions are so dependent on the insertion depth. But inserting deeper, it gets louder and you need to turn down the volume, to compare equivalently, otherwise louder may seem better. Just one of two millimeters in either direction, can change the frequency response quite drastically. and this is the same issue with measurement, who knows what insertion is used my everyone who measures. So overall, one has to take subjective impressions of IEM, with a pinch of salt, cos "it depends", too many factors that can cause a variation in listener perception, and there is no consistency about exactly what is the right insertion depth. !!
When I think of the kind of music that many reviewers are listening to, I wonder, how can they give a reasonable impression of the headphone, when the source audio is already compromised. We need much more good quality objective measurements for headphones, and I think this tells us more than any subjective opinions. Beyond frequency response, measurements like distortion seem to be even more important. Furthermore the subjective impressions of reviewers do not give us any idea - what level are they listening at, cos the Fletcher Munson phenomena predicts if we listen at a different loudness level, our experience is not consistent with any reviewers subjective opinions.