High level speaker signal to Low level RCA (Hi to Low) converter with REMOTE wire.
Amazon.com: Gravity 2 Channels Car Audio Hi Low High to Low Impedance RCA Line Converter for Car Receiver and Amplifier + Built-in Remote Turn-On, Ground Loop Isolator - GR-HL2 : Electronics
How To Install a Line Out Converter (LOC) | Installation and Tips - YouTube
Dietz audiotechnik Powercap & Hi-low Adapter mit Remote ?, Car-Hifi: Anschluss, Verkabelung und Stromversorgung - HIFI-FORUM
ACV 1424-50 Sound Upgrade High Low Adapter Most : Amazon.de: Electronics & Photo
ACV Premium High-Level Adapter 2-Kanal mit Remote-ACV-30.5000-22
ACV 30.5000-04 High Level Adapter 4-channel With Remote Low 4 Channel for sale online | eBay
ACV - High-Low Adapter Premium 2-Kanal mit Remote - caraudio24.de
Necom SIA-P30RM - high/low convertor met remote-schakel-draad - CaRadio
High-Low converter kopen als oplossing voor radio zonder tulp
ACV Premium High-Level Adapter 4-Kanal mit Remote-ACV-30.5000-24