I guess you'll only see the difference by enabling EAX(not supported at this time, because it wasn't tested) and then trying to play with either 5.1 or 4.1. So, bring down console (SHIFT + ~[tilde]), write "HelpUsObi 1"(minus the quotes) and then "s_UseOpenAL 1"(once again minus quotes). I heard that speaker setup you have there is THX certificated, so hopefully you'll get a little bit more out of JK2's sound system using these codes.
