By the way if anyone else builds with this sub re-measure the cut-out diameter. I think I cut exactly what the website said (11.25) and this doesn't seem to leave enough landing. Another .25" or so would have more of the driver's gasket on the baffle. And this in turn would allow the use of hurricane nuts. I am going to have to use drywall screws because there is not enough room.
<edit> and by "exactly" I mean I cut the hole 3/16th's too big (just remeasured). So scratch that, cut it as prescribed to 11.25
. I did get the counter sink for the driver exact...