I've got a hum in my Sunfire sub.....

Bad solder joint on ground on front RCA jack?

Try floating the ground pin of the powercord.

try buying a grounding plug on the end that converts the 3 pin from the sub to a 2 pin for your wall. Often the ground pin causes the buzz.

JWH

Could be caused by a ground loop. That is, if you have the rest of the system plugged into one set of outlets and the subwoofer on the other side of the room into a different set of outlets, you can have a difference in ground potential. The end result is an increased noise floor and / or the potential for hum. You may also have a problem with one or more components plugged in with the incorrect AC polarity. This too will result in an increased noise floor and / or the potential for hum.

Other than that, i've seen more than a few comments pertaining to hum related issues with Sunfire subs. Call up Sunfire and ask for Robert in technical support. He's VERY thorough and will help you as best possible over the phone. Sean
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PS... Any time you call a manufacturer pertaining to one of their products, have the model and serial number handy. This allows them to check and see if your model was produced before or after specific production changes were made, etc...

Those suggesting a ground loop are probably correct IF the hum is there when the sub is plugged in to another sub out connection as well. I interpreted your description as saying it was ONLY present when plugged in to the front sub out. Most HT recievers have a rear sub out as well. If my reading was incorrect, then I vote with the ground loop group ;~)