I was around CAL-M level in 1.6 and I never had a surround sound setup, but I'm unconvinced that it has any meaningful benefit over headphones, which worked per

I was around CAL-M level in 1.6 and I never had a surround sound setup, but I'm unconvinced that it has any meaningful benefit over headphones, which worked perfectly fine for intuiting where someone was. That's hardly a real benefit in higher level play, anyway because you know where everyone could be, anyway, and your movement is dictated by that knowledge as well.