Wayne Parham Messages: 18791 Registered: January 2001
Illuminati (33rd Degree)
Curious fingers are usually the cause of dented voice coil covers. Something or someone has pushed them in. They do contribute to the sound in most speakers, but not subwoofers. Subs usually have a cap that's harder to dent too.
Fortunately, it's usually an inexpensive and easy fix. Take your dented speakers to a speaker repair shop and they'll replace those dented caps.