GND is connected to the negative pole, REM is connected to the control line, and +24V is connected to the positive pole. If it is used in automobiles, REM is connected to open the key door with power, and turn off a dead wire of the key door. At home, REM is connected to the 24V positive pole that can be controlled on and off, so that the subwoofer can be controlled without turning off the power every time. Directly connect the positive and negative poles of the subwoofer to the output line of the electric door lock, the red one is connected to the positive pole+,and the black one is connected to the negative pole-or grounded; You can also connect it directly to the battery (because there is a switch on the subwoofer), and then if you play it with a car CD, connect an audio cable directly to the subwoofer to enjoy the awesome music! The van is the same!