Vibe SQ12 SPACE subwoofer problem

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Hi,
I recently purchased A Vibe Space SQ12 active subwoofer 1000W RMS 3000W Peak. The sub has a built in 500W RMS amplifier. My car stereo has a special subwoofer output. The problem is that when I connect the subwoofer to the subwoofer output it doesn't produce any sound but just vibrations which get stronger and stronger as I push the volume up. If I connect the subwoofer to my front or rear speakers, there is music comming out of it but if I turn up the volume too high the whole system switches off as there have been some kind of overload. The system starts again after I turn the engine off and on again. My car stereo is a Pioneer Avic X1R 4 x 50W RMS.
Any suggestions will be appreciated.
Thank you in advance
 
hi,
I've tried it with the gain and grequency set on the lowest possible level. The vibrations are some kind of interference. The best way I can explain it is as superpositioning of waves. They start low and keep on getting greater and greater (thats when its connected to the subwoofer output). When its connected to the speakers (front speakers at the moment) it plays music but its doesn't produce the frequencies that it should and also the system turns itself off when the mucis reaches certain frequencies..
 
I found out what caused all the problems, it was the earth wire not being connected properly, the metal bit that it was connected had too much dirt on it acting as an insulator, it all works fine now.. Thanks to everyone for the replies..
 
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