I was wondering if it is feasible to hook these two system up on a Sound Blaster Fatal1ty PCI-E sound Card. If so, how (which cables are best, ect)
You need adapters as creative sound blaster audio card have a way of connecting surround anything higher than 5.1 systems or have somebody or make your own connections for the sound card. check 7.1and this is how that thing look like
If your option is to purchase the cable for 7.1 (links above) then buy the 3X (female RCA to mini-jack female socket) for Center/Sub, sides & rears. The front channel can be directly plugged on the soundcard.