Easily add an aftermarket amplifier or subwoofer to your vehicle’s factory audio system with this 2-Channel Active Line Output Converter with AccuBASS and Subwoofer Control by AudioControl. The LC2i PRO converts speaker-level (high-level) audio signals to RCA preamp (low-level) signals so you can install an aftermarket amplifier or subwoofer without replacing your factory radio. This two-channel line output converter also features AccuBASS technology so you can turn up the volume without losing bass.