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My JL Audio 15W5 wasn't blown. I took the system apart to make it a 2 woofer system in a sealed box and when I took the top woofer off, I found the dustcap was half off the cone and it was the source of the "blown sound".
So I ripped the dust cap off completely. It is not needed I hope since I'm running them in a camshell design. I cranked her up and :D , no more rattles :thumbs: I even took pics I was so happy.
Yes the ports are small but this box was done back in 1991 :crazy: and was done to JL specs. Isobarik subs was the thing to do back then. It was orignally in my red Eagle Talon TsiAWD. I've never noticed port noise. I know this, you can blow dry your hair with those ports :jester
For awhile I had these four subs in my home set up. I had used 6" diameter PVC ports on those in 6 cubes each :eek: