Hello guys, I was using Fiio E6 as the amp which connected to IPhone4's audio out(3.5mm) till today and this was working fine. Today i purchased Fiio L9 line out, and when connected as IPhone + Fiio L9 + Fiio E6 + Sennheiser HD558, there is constant static. I read on amazon that Fiio L9 produces static when moving. but im experiencing it even when the whole setup is perfectly still. One more thing, this static is less audible when using my ATH M50s. I think this is because ATH M50 is less revealing(?) Anyway, please let me know how i can get rid of this static?? or shud i go for a replacement?