My thanks to all of you who have responded. Sean, I appreciate the in-depth explanation regarding the adhesives. Certainly makes sense. I removed the driver from the box and operated the system. I could still hear the pop-pop sound with each beat of the song being played. As I turned down the volume from my amp or the volume down on the back of the sub, the pop-pop disappears. It seems to only do it when it's being driven but not driven beyond its capabilities. I have retightened all screws but to no avail. The pop-pop is coming directly from the driver itself. If it is an adhesive problem, I'm just going to return it under warranty (two years on this unit from B&W). Thanks again.
PDN
PDN