does the left and right speakers connect to the subwoofer box? if so, then you just need a cable with this configuration:
left & right RCA male <--> stereo phone jack
connect the RCA males to subwoofer RCA input (should be female) and then the other end which is a stereo phone jack to the audigy 2 Front sound output.
stereo to RCA male
check this model: HOS CMR206