They really opened up after 20hrs mark no longer muddy bloated sound. I don't get critisism about the bass there isn't too much of it, just the right amount to keep you engaging with music. I advice trying experiment with more neutral/cold dacs. Therefore at this point don't feel like doing any mods.
1A in comparison to my HD598Cs (a closed back version of HD598)
Stylish lightweight design and more comfortable pads
Wider soundstage
More detail retrival
Obviously more bass, especially subbass, but still prefer more refined, textured, thighter bass in 598Cs
Worse midrange
Similar treble
Upper midrange is my biggest con of this headphone. Not only it's worse than 598Cs, it's average in general, and I don't think it's because of the bass like I said to my ears bass isn't overshadowing any frequencies. This is bad because upper midrange is highly responsible for enjoyment. In 1A the bass is trying to take up for it, but ultimetly you can feel midrange is lacking. Not in all songs, it's dependent on mastering and type of music. Sony 1A is best suited for EDM, for slower vocal centric songs I still prefer 598Cs. Nothing beats sennheiser lush liquid vocals!
Another minor gripe is about the construction, which is generally good except very cheap plastic "arms". In my pair they make slightly creaking noises, especially on the side with jack connection. My pair doesn't squek at all, and the creaks are not coming from swivel joints, but rather from joints where cups are attached.
Ultimately I'm rather happy for the purchase, wouldn't pay MSRP, but for 98 euros Cyber Monday deal they were worth it!
@Mark Up Thanks I will detatch them and figure out a way how to stretch the mesh. It's not a problem, but it's annoying me
Maybe in the future I'll eperiment with MSR7 pads, but so far stock 1A faux leather pads are very comfortable, plush and soft like lambskin. In fact I can't believe I'm saying it, but... this material is nicer than real leather!