Hi guys. I had tried vpt settings when I bought s639 but I had found them very unnatural sounding and they certainly are. But their 3d feeling is just great for me and I don't really care if music sounds natural as long as I am enjoying it. The problem is there is a considerable amount of hiss when vpt is on. Is there any way to get rid of it? Hiss is really annoying and music would be great without it. By the way, there is the same hiss when eq is on but it is not that perceivable. It gets annoying with vpt. Thanks in advance.