Hello all, I’ve been repairing subwoofers as a hobby with some success, primarily just re-capping them and replacing any visibly bad components. Several of the units I’ve repaired exhibit the same symptom post repair, and I’m hoping that someone can give me an idea where to start looking to address it. The subwoofers will play distorted audio at low volume, which sounds almost like creaking or scrapping for 1-2 seconds after coming on, and then will operate normally, even under high output. This must be fairly common as I have three subwoofers doing it. Can anyone point me in the right direction?