Hello,
The Fostex Hp A3 would actually be quite good but falls out of the budget even if it were plug and play.
Alternatively, the Ify hip dac would be technically up to date as a dac/amp.
And you would have a bit more room for headphones.
The Dolby stuff over headphones is actually generated stereo.
If you have a good stereo setup, it will drive any promised Dolbymytos to the wall.
Dolby only makes sense if you have an av reciever and 5 speakers connected, then it’s Dolby, but not over headphones.
This would certainly be possible with the Iem technology, but it would be very complex and expensive.
A good advice is to get a good pair of headphones and not what the gaming industry sells. 90% of them are rubbish and plastic that will give up the ghost in 2 years.
And it also damages your ears in the long term.
Here are the Ify hip dac threath from the Forum for better Information about.