Thanks guys for replys!!!
And sorry for the late, i work 5 days in a row work/sleep/work/sleep…
It works great with the video tutorial ! No slows times but sometimes, sounds crackles…
So i tried with another speakers, connecting differents wallplugs for raspberry and speakers, with raspbmc, raspbian… the sound still cracks.
I finally guess the card as a sound problem, waiting right now for amazon answer to return/exchange the raspberry!
Thanks again!
Long life to retropie ^^