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Crackle coming from cabinet when tweeter is on, is it blown?

Hey TB I have an Ampeg SVT PR410 hlf cabinet that makes a very obvious crackle/staticky sound only when I turn the tweeter on, and the sound goes completely away if I dial it all the way down. I am not a “technician” by any means so any advice on what to do next would be appreciated. I’ve seen similar questions here before but didn’t quite get the answers I was looking for. And they don’t make these any more to boot. Has anyone had this experience? What gives? Thanks!