Basslink goes BOOM when car door open

[clickart]

I have a basslink connected to my rear speakers and everything works. But sometimes when the passenger door is open, there is a lousy boom noise coming from the basslink. This problem only happen sometimes and only when the passenger door is open. Any ideas?

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[keep_hope_alive Premium Member]

is the basslink on when the car is off?

 

[clickart]

is the basslink on when the car is off?

The basslink turns off when the car is off...

 

[keep_hope_alive Premium Member]

does it turn on and off with the head unit? what head unit?

what vehicle?

does it happen when the system is on or off?