6550c,
Attach a volt meter to the speaker terminals and gently push the woofer cone in and out and see if you register any current. Or, place another speaker a few feet from the speaker with the volt meter attached and play a recording of conversation or crowd noise, at normal levels, and see if you register a current.
Attach a volt meter to the speaker terminals and gently push the woofer cone in and out and see if you register any current. Or, place another speaker a few feet from the speaker with the volt meter attached and play a recording of conversation or crowd noise, at normal levels, and see if you register a current.