Applicability: When the original car host does not have RCA output, you can install a high-frequency to low-frequency converter to solve this problem, increase the stability of components, reduce heat, and extend service life. | Features: The high-to-low converter can convert high-level audio signals (usually from the original car host or CD player) into low-level audio signals, so that the signal can be transmitted by subsequent audio amplifiers or long distances without distortion. | Improved Sound Quality: The high-to-low converter can process the audio signal to a certain extent, such as low-pass filtering, to reduce interference and distortion in the signal and improve the sound quality. After entering the power amplifier through an external high-to-low adapter, the interference will be greatly reduced. | Product Details: You received 1 car amplifier subwoofer high-frequency to low-frequency converter, transparent waterproof shell, the overall size is 2.2" x 1" x 1.5", durable, providing good protection for built-in components. | After-sales Service: The store aims to provide you with more dedicated services. Every product delivered to you has undergone strict quality inspection. If you have any question on use, kindly contact us at any time directly, we will solve the problem for you within 24 hours on weekdays.