Features: 1. High-frequency to low-frequency technology, accurate reproduction of the bass effect, enhance the audio shock force 2.Delay function design, ensure the synchronization of sound effects, to create an immersive listening experience 3. Optimized for car audio, strong adaptability, convenient installation, compatible with a variety of models 4. Built-in high-quality modules, efficiently drive the subwoofer, output strong low-frequency power 5. Stable circuit design, strong anti-interference ability, to ensure pure sound quality without distortion Principle of use: Original host no RCA audio output, so the use of a high-quality high to low is necessary, the host speaker high-frequency signal input high to low, high to low conversion into low-frequency signal and then enter the amplifier. Although many people think that the host directly from the internal low-frequency audio signal to the amplifier or use the amplifier built-in high to low directly with the speaker line high-frequency signal input can not be high to low, but this type of connection is generally input into the amplifier internal signal voltage is too low 0.05-0.3V (amplifier requires RCA low-frequency signal input voltage of 0.5-7V), resulting in amplifier release to a very high volume, the speaker sound is still not enough! Loud, and lead to the RCA impedance and amplifier input impedance mismatch, easy to produce signal interference noise. In addition, this high to low with control signal line input control amplifier synchronous work, to avoid the host and amplifier synchronization caused by switching on and off /ldquo;bang/rdquo; sound, and even cause damage to the speaker overload. Do not remove the host to connect the audio cable, only need to host one of the 2-way high-frequency speaker line input high to low can be, generally take the original door speakers position and the host connected to the speaker line connection can be. Parameter: Channel maximum input power 50W RCA output voltage 0.2V-2V