This process can vary from easy to very difficult, depending on the problem. Yes, you can repair a blown subwoofer, especially when it comes to a partially damaged cone. However, a damaged voice coil will be difficult to replace. Depending on the magnitude of the problem, the best solution is to buy a new subwoofer.
A subwoofer is a specialized woofer. Without subwoofers, our sound system wouldn't be complete. It is possible to damage the cones of our subwoofers when we clean, fix, release or maybe something external happens, as well as damage the voice coil when it is overloaded. The subwoofer is damaged and does not work properly.
People tend to repair the subwoofer cone and voice coil at home because they want to save money or are on a tight budget. In most cases, users can repair subwoofers, and you will surely want to (at the very least) try to repair their subwoofers before deciding to buy new ones, as it is almost always a long and difficult process. Yes, you can repair a damaged subwoofer yourself with a thorough investigation of the root cause of the problem (and the consequent replacement of the part), or you can take it to a local audio store and have it repaired for you.