So I just tried it out, and I think the 3D Audio mod makes it a lot easier to tell which way sounds coming from. A hell of a lot easier. And my 5.1 surround sound makes it sound slightly better in my opinion, but it's a little more difficult to tell the direction. I tested it using a horse, and with the mod I could easily tell where it was with my eyes clothes. With my surround sound I could still tell if it was to the left or right of me, but behind and in front were a lot harder.