It may be much more than just the Amazon/Valkyrie sound placement that is messed up.
Sometimes I hear monsters that sound like they’re approaching from the lower right of the screen. But, then they appear from the upper left instead. And the sound volume of the monsters makes it sound like they’re much closer than they really are. (Very confusing during game-play).
Another, obvious, example is in Lut Gholein. Sometimes I’ll be standing in front of my Stash, near Farah, and I can hear Drognan begin reading from his scroll. And the volume is loud enough that it sounds like he’s standing right next to me.
In the original game, you couldn’t hear him read until you got close to him. And the volume adjusted according to your distance from him; starting softer and getting louder as you approached him.
What Blizzard needs to do is reexamine the entire audio system of D2:R and correct how sound is handled.