You're better off finding an older Marantz or Harman Kardon receiver with Dolby Headphone.
The SU-DH1 may not hiss, but it's internal amp thins up the sound a bit. I find the Mixamp to sound better, with the exception of hiss. The SU-DH1's best thing is the ability to decode DTS (though the PS4 now has settings to output Dolby for everything), and that it can do DH-1, and DH-3 (whereas the Mixamps and most other similar devices do DH-2 only. DH-1 sounds more refined and less processed, but noticeably smaller soundstage. It's like stereo headphones with Dolby Headphone positional cues, whereas DH-2 sounds like a virtual room of speakers. DH-3 just sounbds like a mess of processing.
Edited by Mad Lust Envy - 4/10/14 at 3:55pm