[fenderguy]

hey all. I have a DSM 1515 sub, and i've been noticing a problem. Shortly after i turn on my stereo (within a couple minutes), shortly after i turn off my stereo (within a couple minutes), and sometimes just at random (stereo on or off) my sub will just start thumping. Not even a deep thump either (although it is rather loud)... it sounds like someone is knocking on the wall in the room next door or something. It thumps 6 or 7 times, and then stops. I'm assuming it's picking up some sort of signal from something? i don't know. My cerwin vega LW12 is about 7 feet away, and it doesn't do this. However it seems to me that when i had my cerwin where the DSM is now, it did the same thing. Is there anything i can do to make it stop? I've just turned the DSM off for the past few weeks because it's annoying, and i don't want to damage it. Any help would be appreciated.... thanks guys!