Actually, those Hercules/Crystal cards do not support the hardware option, according to the Readme. Even if it did, it would not have EAX 4 support.
Queer thing is that CMSS-3D is actually supposed to be enabled from the console for Audigy cards -however from the way it is listed seems to imply only the original Audigy not the 2 or 4. I have never heard of a game where that was the case and understood that even if it was enabled (as default) it would not affect games as it would have a negative impact. Many folks figger it has a negative impact on even music and choose to disable it anyway. Perhaps the technology is actually used in BF2 but not exactly in the same way and only the original Audigy drivers require it to be manually enabled in the console.