I don't think it is coming from the amp. I've tried 3 diffrent amps and they all have the same problem. I also don't think it has anything to do with grouding. My Yamaha on the exact same setup has no hiss. Grouding problems usually induce a 60hz hum not a faint hiss. Overall I feel the 950 is great, I just want to be sure that there is not a handfull of defective 950's. Many people swear they can not hear the hiss past three inch's. I actually measured that I can hear the hiss pretty clearly from over 9 feet away, and this is with the volume at -79db.