Type R flapping noise

[Ninjacheezit]

I had an Alpine Type R 12" 12d4 for about a month sounded great. A few weeks ago my box slide all the way to the front of my trunk and was hitting my trunk latch. Didn't think anything of it just moved it away from the latch and got back in the car. Now I'm noticed some flapping noise. I don't know if it was from the latch or if something went wrong but the type r is in a sealed box and air tight. Also I can't hear the flapping noise in the car or outside the car only time I can actually hear it is when I open my trunk and stand back there. It sounds like something is vibrating on the left side of the sub. Anyone know what this could be? Unglued? Blown? Idk help??

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[_dontaskwhy 10+ year member]

look around the edge where the rubber meets the cone. my d2 just started coming apart even tho its in a 2 ft box with 1500 watts lol

 

[Side Show 10+ year member]

could be the speaker cable going to the sub inside the box flapping around. i'd fully remove and disconnect the sub and look it over and make sure you cant smell or notice anything loose/broken

 

[2Dcore 10+ year member]

if its a cracking sound it shot i had 5 of them do that and it just gets worse. I ran alpine for a few years came to the conclusion they are junk. sound good for awhile but than they die quick. Also check to make sure your subs tight or your box isn't coming apart.