How do you connect an AV receiver to a 71 Creative Gigaworks S750's non standard inputs 4 analog stereo input plugs for center LFE front surround rear surround?

You will need a receiver with 5.1 RCA outputs. Purchase 3 adapters, 1/8" stereo femal to 2 RCA. You can then split out the front, center, sub and rear channels and send them to the speakers.