The LC2i PRO is the absolute go-to, active line output converter. What is an active line output converter? It is the best tool, to tie into your factory radio's audio signal, to add a subwoofer.
This unit has Accubass, to fix bass rolloff that a lot of factory audio systems have. It has a bass knob included. It also has a full range RCA output which can feed another amp, Built in load resistor circuitry. 5 year warranty.... complete awesomeness