Can I hook up an axiom sub to my old stereo (no pre-out) integrated amplifier. if so, how? I have seen a post that says you can run the speaker connections to the sub then out of the sub to the speakers but I would like confirmation from an expert!

Look on the back of your sub. See the speaker wire connections, both for in and out? Run wire from your receiver's left and right channel outputs to the "in" connectors. Run wire from the "out" connectors to your speakers.