if it is audigy 2 then it's 6.1. If it's audigy 2 ZS then it's 7.1.
9000 is a memory address assigned to this card so does not tell if it is ZS or regular 2. Both are good anyway. I used ZS before I got X-Fi and was pretty happy with it. ZS has speaker calibration programme and decodes DTS, not sure if 2 can do that. Other then that both cards are quite similar.