Amazon.com: RCA Speaker Wire, Speaker Bare Cable to RCA Plug, Gold Plated RCA Connector High Level OFC Audio Cable Open End for Amplifiers Subwoofer - DIY, 2 M : Electronics
Troubleshooting the Internal Amplifier of a Subwoofer – Klipsch
HOW TO MAKE SPEAKER WIRE USING THE RCA CABLE FOR SUBWOOFER - YouTube