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How I can connect my speaker cable to the back of my subwoofer that only has RCA connections?

I just ran 12GA 2conductor speaker wire to the location of the subwoofer. I can not move the subwoofer coaxial or run on the surface. Is there a way to use my cable to run This self-powered sub. I have an outlet so all you need to do is to transmit the signal through the speaker cable. Is this possible?

In Not really. You must be running a level line interconnection to the location of the submarine. The speaker wire is unshielded and is susceptible to noise; this is especially bad for subwoofers, and you'll be happy and play loud 60 Hz hum. Is the speaker cable through a wall? Maybe you can use to pull adequate interconnection through the wall. If you can not fix the wiring, or move the submarine, your only option is to get a different sub accepts speaker level input.