Do all sunfire subs hum and pop?

I have a sunfire super junior that almost constantly hums and on occassion makes odd pop or ckicking sounds. I have witnessed anothere that had the same hum. Its sounds like the same hum that comes from my cieling fans or low voltage lighting. Obvious I suspect the power. I've tried the Monster HTS 5000. Didnt help. Before I spend more money I thought I'd put out some feelers. Any help would be appriciated. Everything else seems to be fine except a hum bar that runs from left too right only when watching DVD's. Sorry if this is a redundant topic. Thanks for any help.