Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
What cable are you looking for? A speaker cable? Power cord?
Okay so you want the system cable from the main unit to the sub
I can confirm that the part number is###-##-#### however that part is not available anywhere.
This is a 10+ year old system, all parts were discontinued in 2007, so the only option would be finding a used one, or having a new cord custom fabricated, which would not be feasible. You could buy a new system for less than you'd spend to have a cord made up. I'd recommend setting up a search alert for the###-##-####part number on ebay.
Other than that, your best option would be to either use the system without the sub, or to replace the entire system. This model is well past its service life anyway, so I'd hesitate to invest much in it at this point. If you wanted to have one made up, I can get you a pinout diagram if needed.
Best regards, ***** ***** for the news,
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