Getting Both Channels out of my M-501

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I have a Onkyo M-501 amp. I want to drive a JBL sub that has dual inputs. My problem is that my amp will only push one channel at a time because I don't have the Onkyo preamp. There is an input cable from the preamp to the amp which enables both channels. This seems like a marketing gimmick by Onkyo to get you to buy thier preamp. My question is how to disable the plug and be able to use both channels at once. I am ready to tear into the amp but thought I'd see what the experts have to say...... Thanks in advance!
 
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