I just installed a XL 18 in my truck on thursday, and have been hearing a popping noise when i start to turn it up. It sounded like a blown sub, so today i went out and turned it up to see if maybe the box was leaking, or something going on with the sub. The dust cap is starting to lift on one side, and slaps against the woofer causing the noise. So was wondering, what do you seal it with? Should i remove it completly and re-seal it, or maybe ill buy another dustcap and replace it. If i go that route, can someone p.m. me a price for replacement dustcap?