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Message: <blockquote data-quote="stlcard88" data-source="post: 1615721" data-attributes="member: 423906">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?</blockquote>