1Function: This two channel level adapter converts your signal from your factory amps to enhance your bass output with high efficiency. 2Practical: This dual channel line converter is easy to tune with main level, bass to reach your perfect bass frequencies that you are targeting. 3High Performance: The adapter brings out even more bass output, and will avoid the interference of the conversion inside the amp. 4Easy Installation: Simply connect the stereo's speaker wires to the line output converter's inputs, which is practical and energy saving. 5Universal Fit: Suitable for your vehicle equalizer, amplifier, stereos system. Also works with home audio equipments like theater setup applications.