Amazon.com: Scosche LOC2SL Line Output Converter Adjustable Amplifier Add On Module for Car Stereo, 2-Channel Signal Sensing Speaker Wire to RCA Adapter with Remote Control Knob, Black : Electronics
Waza Air Mod for 1/8" Stereo Line output
power - Speaker level to line level - Electrical Engineering Stack Exchange
What Is A Line Output Converter? The Definitive Guide
A good line output converter (for a home stereo) that can handle 65 watts RMS / ~100 max? : r/AskElectronics
E3iO.com: Two Channel Hi-Lo Line Out Converter | CarPC | Custom Computers | Desktop PC | Carputer | Gaming PC