Details about car speakers construction

Hello
The sound speakers of my car had a problem. When I tried to fix it myself I found a mess. Can anybody help me with the equivalent circuit of the speakers ? why a magnet is need ? and why capacitors are connected to the output of the speakers?

Re: Speakers

HI DEAR,

CHECK THE ATTACHED FILE IT CONTAINS SOMETHING FOR YOU.

Speakers

Thanks for the file , but it doesnt contain useful information about the electrical circuit.

Re: Speakers

A speaker has an electromechanical circuit. It is a second order circuit that takes into account a lot of physical parameters. But i do not think you are interested in this. I think you are searching for the wiring diagram of the speaker system of your car.

Capacitors on speakers are usually used to implement crossover filters and drive each speaker with appropriate frequency

Speakers

Thanks cesare, I am really interested in more details. Would you suggest any literature to read ?

Re: Speakers

Ahmed, I don't think you have any "electro-mechanical" problems.

Some factory speakers, those that come with a car have small, cheap filters attached to the speaker that allow for better sound and longer life. Whether they be low pass or high pass filters, you will often see resistors and capacitors next to (and soldered onto) the speaker terminal. These are cheap fixes by the car manufacturer, and in the case that the speaker sounds bad, you should replace your speaker.

A replacement speaker is usually of a higher grade than that of a factory one, and you will be pleased with the sound even without any filters attached. But for the best sound it is best to have a filter network.

Google car audio.

Since you're on here you should know a thing or two about resistors and capacitors, so you also might want to Google filters, butterworth, Linkwitz, Riley, Chebyschev, etc...