If you are here to listen to music, it is recommended to buy a subwoofer. You will have a shocking music enjoyment. Of course, if you want to enjoy a movie and enjoy the audio-visual feast, it is better to use a subwoofer.
You can also buy expensive speakers and have good audio-visual enjoyment. It's based on your own habits.
If you just listen to music and watch movies, ordinary speakers are enough to meet your needs.