Many car owners may have a confusion that what is the good shallow subwoofer? Its usual. Well there are various subwoofer is best based on your needs. Because some people need big bass and some people needs solo music. Some people have space on their car so they can have a 12 inch subwoofer on it and some don't have any space so they need slim subs. So what is the best match for you that is completely up to you.