Dual xpa4640 wiring from 2 rca from head unit into a single sub

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DethRattle

CarAudio.com Newbie
This might be easy for some but i've only had it wired as a 4 channel. Theres a 2 channel to 4 channel switch and 4 rca's on the other side of the amp. I just have 2 rca's coming out the head unit ran to the trunk right now and want to use this amp to power one sub. Please help i'd appreciate it.
 

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DethRattle

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