pietcux
Headphoneus Supremus
You're are a bit wrong with that statement that closed back headphones do not work with surround sound emulation. If anything, it helps them, even if it's a little boost in soundstage. The CALs for example can take advantage of surround sound emulation very well even though its a closed back headphone but it's sound stage increases and the mids somehow are a bit more noticeable as well.
Same goes for my closed Sony Z1r and Z7. And if I remember correctly for all my closed cans that I had. Most of the time since 2003 I had either creative or Asus surround cards external or internal.