If you aren't getting any sound at all from a speaker that you suspect has blown, one way to tell for sure is to check for continuity.
Ọ bụrụ na ị naghị enweta ụda ọ bụla site na ọkà okwu ị chere na ọfụala, otu ụzọ ị ga-esi gwa nke ọma bụ ịlele maka ịga n'ihu.