DS7200 Subwoofer

I am replacing my Polk DS7200 amplifier/receiver with a new one which will have binding posts for speakers and rca output for a subwoofer. I'd like to keep using the subwoofer but the only input is the 25 pin DIN plug. I'd like to find out which pins are the input for the subwoofer ( I assume two of them are) and whether or not this is a good idea. The alternative is just getting another subwoofer. Any help would be appreciated.
Thanks,
Mike

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