Your stereo’s subwoofer is dedicated to low-pitched audio frequencies, or bass. Playing music too loudly and forcing excessive sound through the subwoofer may cause the speaker voice coil to separate from the speaker cone, damaging performance and resulting in what’s known as a blown speaker. If you suspect your subwoofer may be blown, there are a few simple ways to diagnose the problem. Writer Bio

How to Tell If a Subwoofer is Blown  - 9