I don't remember saying that. With Shure E530, it's not surprising you'd hear some slight hiss at high gain, but that's why there's low gain. I've never heard of any hiss with a GS-X (except maybe max volume at high gain) with any full size headphone which is why I suggested you send it to me. Only time I've ever had an issue like that was on a prototype GS-X module where the AKG K1000 was creating instability, but only when driven balanced, and it resulted in some hiss