Does anyone know any cheap solution to have a decoder that would take at least optical in (computer and PS3) and have 5.1 outputs for computer speakers (using 3 x 3.5mm jacks)? I am looking something for the kids, thus I want to keep it cheap and the sound quality is secondary.

I have so far been using my Headroom Micro Amp/DAC stack with Shure E500 and always noticed audible hiss on quiet parts and between the tracks. But now my Proline 750's are burned in and plugged them in and immediately noticed no hiss. I am still using lowest gain setting like with E500's...

Sorry if this has been asked before, but the searching about the subject seems overwhelming. I am looking for closed headphones to use in situations where my HD-600/HD-650's leak too much noise outside. I like very much the tonality of those Senns and would like to find something comparable...