This is just a sub-woofers circuit diagram. There is no diagnosis or repairing on this video. so if you think this video is useless for you then just leave without wasting your time. But if you are really interested to diagnose and repair your own speaker system then be with this thread. From this circuit diagram you will get an idea what is inside of a subwoofer and how the circuit diagram looks like. If you dont know anything how could you manage to diagnose or open your speaker system circuit ! Now if you are completely new with this type circuit diagram then try to familiar with the electronic parts. There are lots more Capacitors, registers, different types ic, potentiometer, fuse, diode etc you cant expect same kind of trouble it may occur for you, so you need to diagnose properly to identify your sound system problem. I would strongly recommend to read description window for more detail And there are hundreds of comments where i suggest different type diagnose techniques and way, and most of the time those are all different. So if you have time read the comment section carefully you will get variety of suggestions there. If still have problem let me know in comment section Will try my best to help you And thanks for visiting my thread and channel. Take care and Have a great day !!!