Sound Magus HTL8 4 Channel Line Level Adapter Switchable from 2 to 4 Channel...

SOUND MAGUS HTL8 4 Channel Line Level Adapter Switchable from 2 to 4 channels

Beyma - Sound Magus - Accessory HTL HI-Low Converter 2

SOUND MAGUS HTL8 4 Channel Line Level Adapter Switchable from 2 to 4 Channel

CT Sounds CT-LC2 2-Channel Premium Line-Out Converter with BassLift

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

[ US SELLER] Taramps Crx4 Electronic 4 Way Crossover RCA 8V Car Audio Processor

Sky High Car Audio Line Out Converter HL2 2 Channel Hi to Low Subwoofer Output