Car sub woofer is doing unwanted 'excursion' ?

daaaniel

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So i have one of those Fusion Bass Tubes (one that has a built in amp etc)

Ever since recently as soon as i turn the car on the sub just does this:
http://www.youtube.com/watch?v=SnXFuesr2tg&feature=related

It isn't in time to the music i play, its just a straight 'pulse' like shown in that video. when i turn the gains down on the sub the pulseing isnt as intense but still, the sub is not responding to the music.

Ive double checked and re - plugged in the RCA plugs etc.

Thanks
Daniel
 
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