Rockford Fosgate RFI2SW Adapter cable from Speaker wires to RCA plug Rockford Fosgate RFI2SW adapts high level speaker to low level RCA adapter Speaker wire to RCA connectors.OFC (Oxygen Free Copper) for corrosion resistance RFI2SW Rockford Fosgate RFI2SW Adapts from speaker cable to RCA plug. A High Level Speaker to Low Level RCA Adapter may still be required