Need cure for Sunfire True Subwoofer hum

My True subwoofer performs admirably but from time to time it emits a very pronounced hum. Any Cures?

rsi122512-09-2003 1:56am

slappy Details Discussions Posts This discussion Message User 903 posts 12-09-2003 at 03:14am Copy Comment URL Report Comment Edit Delete Teach it the words?
rel Details Discussions Posts This discussion Message User 221 posts 12-09-2003 at 05:24am Copy Comment URL Report Comment Edit Delete I used to give mine a good whack every now and then, which would fix it for awhile, but not very long. Eventually I succumbed and sent it back to Sunfire. They fixed it and upgraded it to the equivalent of a Mark IV for about $200+ if I recall correctly.
elevick Details Discussions Posts This discussion Message User 2,636 posts 12-09-2003 at 06:01pm Copy Comment URL Report Comment Edit Delete I sent mine back to sunfire for the upgrade. It was free + shipping back then. The hum is inherent in the original.
bobspeak Details Discussions Posts This discussion Message User 21 posts 12-09-2003 at 10:00pm Copy Comment URL Report Comment Edit Delete I used a cheater plug on mine (so I could invert polarity) it helped somewhat.