The size of a subwoofer is not the only factor that determines its loudness. Other factors include the power output, the efficiency, and the enclosure. However, in general, larger subwoofers tend to be louder than smaller subwoofers. This is because they have a larger cone area, which can move more air and produce more sound.
For example, a 12-inch subwoofer will generally be louder than an 8-inch subwoofer. However, there are some exceptions to this rule. For example, a high-powered 8-inch subwoofer with a good enclosure may be louder than a low-powered 12-inch subwoofer with a poor enclosure.
Ultimately, the best way to determine which size subwoofer is the loudest for you is to test out different models in your listening space.
