Well since no one answered me, and in case anyone else needs this info and searches, I'll answer my own question. I would recomend to anyone installing these to provide at least 3/4" clearance in front of the speaker, preferably one inch. Wow, they jump //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Richard