Using the Z-5500 and X-Fi Extreme Music combo. I notice that when I play games like COD4, it's hard to notice positional sound effects. Sounds that originate behind me do not sound distinctly like they're behind me. It's almost like every sound no matter where it originates from sounds the same, position wise that is. I did some testing with grenades and I found that if a grenade were to explode behind me to the left, the sound of the explosion can be heard from my rear-left and front-left speakers. Is that normal? If the sound originates behind me, shouldn't only my rear speakers be emitting sound? If I test my speakers using the Creative audio console where the female voice says "front-left, center, etc," everything seems to be in place, that is, "front-left" only emitts from the front-left speaker and the same for the rest. I currently have my speakers plugged into my sound card using the default 6 channel cable that it came with.