Car Speaker High to Low Converter RCA Line Subwoofer Audio Impedance Converter Low Audio Flter Audio Output Features: Premium line output converter . Converts car speaker wires to pre-amp output High quality, durable construction Gold-plated RCA tips for reliable signal transfer Wiring diagram sticker included on bottom of unit These are a major time saver when installing an amplifier to a source like aftermarket without RCA Jacks on it. You will not need to run a turn on wire from the front to that back of the car! You run the power wire and ground to your amp like normal and then connect this to the power and turn on of your amplifier! Diagram Included on unit. How to work: The unit has a built in relay, when your stock stereo sends sound to the speakers, this device converts the speaker signal to RCA jacks for your amplifer and at the same time, it feeds 12 volts to your turn on of your amplifier that it takes from the power side of the amp. Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x RCA Line Converter