Klipsch Promedia 2.1 thunder noise

[ViperVin2]

about once every day, my klipsch promedia 2.1 makes a Thunder type noise that lasts for about 10-20 seconds. it seems to be happening at any random time. once it stops.. my music sounds fine. anyone have idea wut this is?

 

[ViperVin2]

btw.. it seems to be coming from the right (main) satellite...i didnt get a chance to see if it was coming from the other satelitte or sub