If you have an SA-8 you will know //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif There is a lip on the outside edge of the frame a bit above the spider landing -- this whole area is filled in with glue.
now guys not every sub out there will benfit from adding glue to the outer diameter of the spider. it wont mean it raises the powerhandling of other subs.
i didnt hear about the dumax tester that is interesting.