Amazon.com: 1' 18 Gauge Speaker wire with RCA Female Pair (Black & Red) to Open Speaker Termination Leads : Electronics
XD-CLRAIC2-SW - Car Audio - Audio Connections - RCA to Speaker Wire - JL Audio
Amazon.com: DS18 V2HL 2-Channel Line Out Converter, High-Level Speaker Signal to Low-Level RCA Adapter with Built-in Audio Sensing Technology; Produces Remote Trigger Output to Control Your Aftermarket Equipment : Electronics
Kicker KISLOC 2-Channel K-Series Speaker Cable To RCA Adapter with Line out Converter for sale online | eBay
High to Low Output Converter w/ Gain Control 2-Channel Speaker Wire to Gold RCA | eBay
LOC90 Line Output Converter | Convert Speaker Wire to RCA