I'm no stereo guru, but I am a carpenter and Gorilla glue is a pain and not that reliable for non porous materials. Gorilla glue cures off of the moisture in the material. I would use Polyurethane construction adhesive like this stuff, http://www.stickwithpl.com/Products....9-a343f2ef9458
. I have used pretty muck every type of adhesive and this is the one that never fails me. You can get it at Home Depot or Lowe's, just don't get it on your carpet.
Hope this helps.