Harman Kardon SoundSticks Computer Speakers "intermittent crackle subwoofer" Questions

My Bose Cinemate series ii is making very loud intermittent crackling sounds Usually made from interference of some sort. Make sure that all wire connecting from both the input on the receiver and the

...intermittent annoying crackle I'm not sure if it has anything to do with my 17 yo son and friends' misuse of the speakers but my Soundsticks 2 have developed an annoying crackle and popping noise ...

Sub Speaker giving intermittent loud crackling and sharp loud popping sounds even with main volume control turned off. Crackling sound can be reduced by turning sub volume control off. I would assume ...