How to Hack a Headphone Jack - circuitbasics TRS audio plugs are found on standard stereo headphones that don’t have a microphone. After you cut into the cable, you’ll probably find one of three common ways these can be wired: Copper wire ground sheath wrapped around two insulated audio signal wires. Two separate insulated wires, each with its own signal wire and a ground wire inside. How to Wire a Stereo Jack to Two RCAs - mediacollege Stereo Jack to 2x RCA. For example, a stereo headphone output can be split into left and right connectors, and one possible use for this would be to use these two independant connectors to feed left and right monitoring speakers.