I know MH3U 3DS doesnt have this,even the 3DS dont have it. But i really miss MHFU and MHP3rd Dolby Sound on PSP on earphones. I played P3rd and FU yesterday (although my analog nub is broken) to hunt Tigrex. My earphones can detect Dolby sound and the sound quality of the two games was so GREAT compared to 3DS sound of MH3U on earphones. The PSP can play Dolby why cant the 3DS do that. One thing MH is great about is its music and background sound effect. Poor thing the 3DS cant implement that without Dolby.
3DS FC:2552-0822-9372 DARK Friend Safari Playing: MH3U (Siegfreath) and Pokemon Y (Vann).Soon to Play MH4U!
Let's be honest - the 3DS has pretty passable surround sound that even I can pick up (and I'm rather hard of hearing at the best of times) - and considering the advances in sound technology since the old Game & Watch series I'd say things are probably approaching as good as they're likely to get without wiring the consoles into your head.
Where logic won't work - I will PAL Gamers unite - http://www.gamefaqs.com/boards/277-pal-gaming