Same here, Just bought the thing, (Asus G750JH) It came out of the box with this hiss, I upgraded to Win 8.1, then tried two updated Realtek drivers, no luck, even tried uninstalling the Realtek drivers and using the Windows drivers, still didn't solve the problem, I then tried the most recent Realtek driver (V6.0.1.7183) still didn't fix it.
I talked to Asus support, and they offered me a replacement system, before I sent mine away for replacement I went to a local store with a demo on a G750JX and plugged in a set of headphones sure enough theirs had the same problem.
This problem exists on
From my limited knowledge on the subject, it seems the built in amp either has improper shielding, or the amp has too high of an output impedance for most everyday headphones (or lacks the circuitry to modify the output impedance to suit the headphones its driving)
Eitherway, this seems to be a serious design problem, and is very annoying for people with low impedance headphones, has anyone solved it through software fixes?
