Hi! My ATH-m40x recently broke and I decided to upgrade a bit, so I picked the DT990 Pro 250ohm and when they arrived I started looking for amps and that’s where I discovered Zeos. Big mistake.
So for the past week I’ve been through the rabbit hole and willing to update my setup a bit but every video/post whatever bit of information I read leaves me more confused lol, so I’m looking for your expert help to advise me and make a better decision 
My current setup is:
-Behringer UMC22 (I mainly used this for a condenser mic but I discovered I can use it as a DAC)
-DT 990 Pro 250ohm (I’m probably returning these to get a better set of cans)
I’m pretty convinced on getting the JDS ATOM Amp in order to power the new headphone I’m about to add but I’m having doubts on what would be the best bang for my buck.
I haven’t really tried a lot of headphones but I would like a more pure/natural sound like the ATH m40x I think have, I’ve looked only at open back headphones but I’m open to your suggestions. Budget is around 400$ usd max
Options atm are:
-HD6XX (220 usd)
-HE5XX (220 usd)
-Mackie MC-450 (300 usd)
-and Hifiman Sundaras (350 usd) which would be my endgame I guess.
Thanks a lot for reading my post, I hope u can help a noob out, I’ll mainly use these to listen to music and I would like something that stays true to the original music sound.