Installing a powered subwoofer in a 2011 Honda civic, factory HU?

I am installing a Sound Ordnance B-8PTD into my Honda's factory Head Unit. I was told that I will not require a speaker level converter since I do not have a built in powered amp.

Which wires will I need to tap into? I cannot for the love of me find any info on an instillation without rca input/output and I would rather just man up and do this myself (rather than spend extra cash)

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