I was not as liberal as @
CleanSound , but I did smother the area where I thought the sounds was coming from. My method was to remove the plate, plug it in and turn it on and then listen with a rolled up paper cone. The noise seems to be emanating from the coil that was not covered with the white silicone from SVS. I did then plug it back in to listen with my fancy paper cone, and the noise was there still, but seemed to be a lot quieter. I will give the 388 24 hours to cure, and then reassemble the sub and see what the result is.