Some time ago I bought S760D speakers, as soon as I got them connected to my pc and turned them on(sound blaster soundcard) I heard hissing noise. I used optical cable, also tried RCA cables, exactly the same story. So I tried changing some settings what were given to me in soundblaster software, but that did not change anything. Also I tried separating all the cables coming from subwoofer in my case to see if that would solve the problem. Than tried moving them to another power outlet(tried 3 diffrent ones huh). What else I tried hmm, well I hooked them up to my samsung TV with optical cable and same hissing sound. I know that slight hissing from some speakers might be normal, but I can hear hissing from aprx. 3 meters(6.5 feet) away easily and it really makes things bad as I am using them as desktop speakers. So I sent them off to Edifier warranty and after TWO months, I got them back and they said nothing was wrong with them. So I am really confused as how come they did not hear the hissing as I clearly stated in the letter I sent them before that the reason I send them is the hissing.\nHissing itself is constant sound, does not matter how loud i listen, still the same level of hissing, so basically it does not go up with volume. Should I send to another warranty place in other country maybe, also if somebody has already Edifier S530, s760 or something similar shed some light if thats normal, because when I have them on and I do not listen to them it drives me grazy ;\/, or is there a way to fix this myself, altough I have tried many softwares with it.\nAlso sorry for my english, not native speaker :D and thanks in advance!