Have you tried what a bunch of others with mute booms have trie....if the fault is in the speaker itself many have had sucess with poking the speaker membrane actually through the fur & plastic cover.....i have done something kinda similar and i took out the bad speaker and plugged in a better one.....ive found that if none of that works, it may require more surgery to fix/replace a faulty motor....diagnosing what didnt help is oddly enough can be great,MN frustrating but eventually great. Let me know if anything helps