Car Audio Line Output Converter 2 Channel High to Low Audio Signal Adapter Bass

2 Channel RCA Line Output Converter - High/Low Level Car Audio Adapter - Subwoof

Orion OLH28C 2-Channel High-to-Low Converter – Speaker Wire to RCA Line Output,

RECOIL LOCD 2Channel Line Output Converter Driver, Auto Sense Remote Turn-on

DS18 V2HL.V2 2-Channel Line Output Converter with Speaker Emulator (Remote out)

Blaupunkt EP1700X Car Audio Digital Bass Enhancer 2channel Line Output Converter

Orion OLH28C 2-Channel High-to-Low Converter – Speaker Wire to RCA Line Output,