How to add sound to a motorcycle?

My own car is now installed on the need for things Not a lot, MP3 car charger cigarette lighter 5-inch subwoofer and then buy a 20A three-wire volume converter car to replace a piece of electric car 12V14AH battery so that the car to go there where the people hi to there especially cool ~ ~ ~ ~ ！！！！ MP3 and the role of the subwoofer I will not talk nonsense, the car charger is to charge the MP3, the purpose is to let the MP3 at any time will not worry about running out of power (add to buy that in the USB plug so that the MP3 cable just use) cigarette lighter is plugged into the car so that in the car wash the P3 and the charger will be very easy to take down the 20A volume switch is connected to the subwoofer to the subwoofer volume switch unplugged with three wires to the subwoofer volume switch, and then the 20A volume switch is connected to the subwoofer. The 20A volume switch is connected to the subwoofer, and the volume switch on the subwoofer is removed and connected to the handlebar with 3 wires so that the volume can be easily adjusted. The electric car battery is large, and after installing it, you will not be unable to start it because of insufficient battery power. I've created my own method of installing a stereo on a motorcycle, and I'm dedicating it to you today.