Hi there. My problem is that I hear both channels at the same time (and
with the same volume) on each side of my headphones. I looked
everywhere and disabled hardware acceleration from dxdiag, but my
onboard souncard (Realtek ALC662 on a Asrock Alive Xfire r.3)
driver/software does not have any 3d option to change. Neither the
volume icon tray.

I tried also to change the output from 2 speakers to 4 to headphones,
from the Realtek software and even using the front jack or disabling it
does not change anything.

I have the same problem on my spare pc (with an Asus A8N-e and an
onboard Realtek audio chip).

I tried to change headphones and I always hear each channel on both
sides.

The most strange thing is that if I connect the speakers, they seem
very much to play each channel separately.

Any help/suggestion would be greatly appreciated.