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if its shuting down the voice coil is probley bad! u need to replace it ! i got 2 1200watt square subwoofers and they did the same thing . it was the voice coil!
the circuit board and amplifacation supply inside the sub are blow or shorted out.thus preventing any sound. the head phone jack works only because it is a bypass feature supported by the actual computer not the surround sound unit
I Think its a loose connection in electric circuit. Due to vibration in the woofer the connection might be going off. Check the power circuit for any loose connections.
The problem is a burned transistor inside the subwoofer. It depends of country's transistor manufacturer. It is supposed to be of a low quality. It's not important for the scope. Mine is knocked down for a year. I saved the electronic schematic diagram and the transistor specs, but lost. I confirmed the cause opening the subwoofer and examine the board. The indicated transistor surrounded area is burned indeed. If anyone find the article in web, please, post here.
Read this http://forums.creative.com/creativelabs/board/message?board.id=speakers&thread.id=8037&view=by_date_ascending&page=85 I was about to buy these speakers, but not after reading this
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