SO I got my new subwoofer 12 inch Fi x in today. Sounds great but when I put the bass level over 1 or the bass is hitting hard for some songs. The the cap goes like a water bottle and pops . the dust cap goes in and pops out it's loud and I am scared it will damage the woffer. Nothing is lose the box is a dual 12 sub box single port each the ports are small. Do i need to make the ports bigger or whats wrong with the sub??