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I am using AKG3003i. I tested it again and it still hiss.
What earphones are you using? I think it's related to the low impedance and insufficient current thing.
I can't believe in this day and age it's possible for a phone, much less a high-end one, to experience this problem. Or maybe I've just been spoilt by my iPhone (which is quite the irony since iOS devices/iPods have never been known for the SQ)
Strange thing is that certain demo units do not have this issue, and certain sets experience this problem only to a very tiny extent. Batch fault?
I am using AKG3003i. I tested it again and it still hiss.