Bass processors are used to adjust and restore low frequencies in a car audio system and help achieve a more pronounced and accurate bass response. They can work with factory-tuned signals, restore attenuated bass frequencies, or create a high-quality line-level output for an external amplifier. The range includes simple Hi/Low converters with bass adjustment functions as well as advanced processors for more demanding installations. They are especially suitable when integrating a subwoofer or amplifier into the vehicle's original audio system.