How to wire a car stereo output subwoofer?

The original car stereo many only have a direct line to the speakers. You can split the line out of the direct subwoofer. High-frequency input interface. If you are not afraid of trouble. You can also change the line into a low-frequency input. The equipment used is as follows. High to low a. Amplifier delay controller. Power cable. One audio cable. A number of ties. A subwoofer.