Talk to Dermot at Sumiko.
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I did some quick Googling, and while I didn't find anything totally definitive, I found several strong indications that the pinouts on that XLR connector are not to the usual standard. It appears likely that pin 3 is ground, rather than pin 1. You'll want to verify that with Sumiko or elsewhere before connecting the sub, because of course you don't want to wind up grounding an amplifier output.
I also found an indication that pin 1 is Right and pin 2 is Left, but interchanging the two channels shouldn't make any difference since they presumably get summed together.
Re your original question, I don't see any technical reason to replace the connector.