[T-Bone]

Hi, I'm new here and apologise if this is a dumb question (or if it's been asked before), but can someone please tell me if MoH:AA actually uses EAX / 4 channel sound?
I have a SB Live card and 4 speakers set up, and this works great with other games such as Ghost Recon - but no matter what setting I use in MoH, I only ever get 2 channel sound. (i.e. neither the 'quad speakers' nor 'surround' setting gets the rear 2 channels going).

Any advice/suggestions greatly appreciated.
Thanks.