Title might be confusing. Basically, I have the Sony MHC-GX99 Home Theater set. It comes with a subwoofer (model no. SA-wg99). This subwoofer has an input on the back, which connects to an output on the speaker hub. The cable that came with the system has since stopped working, and I'm trying to find a replacement. I've been searching for going on 3hrs now, and I cannot find what type of cable it is. The output from the speaker hub is RCA, but the input on the subwoofer isn't(small edit, it's only one port on the back, so I don't even know if it's RCA. The RCA plugs fit in there, but it's only one. So in summary, it's 1 RCA to 1 Unknown cable). It's ever slightly smaller, and black. It's not an AUX, it's not an RCA, and it's not 1/4" Phone. I looked in the manual, no mention of the cable. I have absolutely zero idea what this input is. Any help? The subwoofer and speaker set were made in 2007 if that helps. Yes they're old, I'm too annoyed to care atm.