Topic: need help diagnosing speaker buzz

[weroflu]

Been using these microlab powered two ways for a few years now with no complaints. I'm getting some buzzing on certain notes in the woofer. It sounds like some sort of resonanance with the speaker itself, but I don't know much about speakers. It is not blown or torn. I thought maybe it was coming from something like the dresser it is resting on, but no.