uhm hard to say man ive had this "popping" noise the second day i got it so i havent been able to play it hard, and plus my shitty amp is maybe 6 or 700 rms. but 2 15s in a intengra with the right box will probably be pretty stupid loud thats forsure maybe like 4.5 cubes @38hz thats probabbly just a tad bigger than id do for 2 12's. what amp are you putting it to?

 

Sorry had to lol at that one...........

 

are you talking about the spider? should be a warranty issue....

 

like ive said i dont know if its the spider, the cone and the vc just have seperated