JBL Creature Speakers Question

I was not sure where to go with this question. Hopefully someone can offer advice in this forum. I use the above speakers. Within the last few weeks I notice that everytime the a/c comes on or sometimes even when you turn on a light you can hear a "pop" in the speakers. Could there be a short? Is it safe to leave them hooked up to my iMac? I have had them for about four years and this has not happened before. I do not want them to damage the computer in any way.