Is there something wrong with my Alpine Type R sub?

stlcard88

New member
I just had an Alpine Type R installed today. I have an Alpine MRP-M850 Amp going to it. Well it sounds really good when I am in the car and even good when I am outside of the car but when I open up the trunk the sub seems to be making a really weird noise when it finishes each bass sound. Like a rattle out of the sub. I don't know what it is and if I wouldn't open up my trunk you would never know it makes a weird noise.

Does anyone know if anything is wrong with my sub? or is there just something that needs adjusted or what?
 
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