Thanks for the suggestion.... What would you suggest as a stepup/upgrade to these on a 600 to 700 euro budget that is substantially worth the cost? .. I don't mind getting used/second hand
The thing is my suggestion may well not be what you want. That's why I usually do not like to give recommendations but rather would suggest to listen to a few headphones I think are worth listening to.
For instance some find the HP50 or MH40 realistic, some even the AudioQuest headphones. I don't but some do. Who am I to tell them they are wrong ? Some say the K500 or K501 is the best sounding one or Grado's.
Some headphones have the ability you 'accept' them despite being colored, others may start to sound off or remain good.
It's not the headphones changing, its the brain adapting.
That is the problem with recommendations. All I can say is what I like and think sounds realistic to me.
Given the HD58X preference I would think the K371 and AEON closed (2). Never heard nor measured the Ether CX.
I really liked (but am told not to) is the HD820 which sounded good to me.
Also the more expensive Fostex/Denons have their good properties. Perhaps consider the NDH20 (mady by Sennheiser). I even thought the HD630VB sounded reasonably well and the bass adjustment was really helping when having the player on random play.
Even the Shure SRH1540 has some good properties as well as the ATH-MSR7(b) a bit 'sharp' but can be fixed with a filter or EQ.
Some need EQ, others less so.
Personally I like my (modified) DT1770, stock it is not that great though.
It is not easy to find excellent closed headphones but they do exist.