Hey all, I'm posting this for a friend: I have an Atlantic Technology Speaker System that I bought in November of 1997. I January of 2001, I started experiencing a problem with the powered sub-woofer. Below is the problem, symptoms and remedies I have tried. Problem: The powered sub-woofer lets out an intermittent "chuff". This occurs anywhere from 2 minutes apart to 10 minutes apart. Sometimes it is very loud, other times it is faint. The sub's volume control doesn't affect the volume of the chuffing. Symptoms: This happens while the sub is connected to the surround-sound system, whether listening to CD's, or using the pro-logic while watching a tape through the VCR. Don't have DVD yet. It also happens while not connected to the stereo system, but just plugged into an outlet with the sub powered on. It also happens at a friends house not connected to any stereo, just powered on. Remedies: Have tried a different power cord - problem still exists. Have tried using a "Cheater" between the cord and outlet problem still exists. Tried it on different circuits, problem still exists. The dealer/stereo store cannot recreate problem in their store. Therefore they can't fix what they can't find. ANY SUGGESTIONS !!!!!!