Hi, I have an Audioengine S8 active sub that is out of warranty and misbehaving. It produces unpleasant crackling sounds at all volume levels. I have inspected the cone for tears or damage and seen nothing, and I have opened the enclosure to check for loose objects/wires/debris, but it was all good. What I did see during the inspection was two big 63V 10000uF electrolytic capacitors with bulging tops, and one looks like it's leaking (see the one on the left in the photo). I've already ordered in two new caps of the same specs (though a different manufacturer and diameter, they should fit fine). My question to the audio and electrical types is: is there any other possible cause of the crackling sound I should investigate? I have a good variety of tools available; soldering irons, DSO, multimeter etc. Any suggestions on other things to investigate if the replacement caps don't do the job? Fortunately (and surprisingly to me) all the electronics are through hole parts and it looks like a single layer board, so I imagine I can replace any parts myself with no trouble. Before it comes up; all the other capacitors in the board look completely fine, and I didn't see any damage to the PCB from electrolyte contamination, but I'll give it all a good clean before putting it back together.