You're getting hiss straight out of the S8 as well? . that is concerning. I think hiss interpretation varies from person to person, some people (myself included) are just more sensitive to it. I tend to get quite bothered by it. I was unhappy about the hiss from my magaosi k5, and I've already placed the order for A5 (shipped). this is just not good. Can you check if theres noise at zero volume? goto spotify or music player, play some music, and then reduce volume to zero and see if theres hiss?