It must be the angle of your photograph...but that looks a lot smaller than 4-5".

Below is a pic of where my rear left surround will go: either above the doorway, or about 2-3' in from the rear wall on the beam. I don't want to ceiling mount above the doorway, because then it would hang in front of the casing.

I know this is just a 5.25" woofer: not strong enough to lift the ceiling tile....but what about rattle it being that close?

Axiom? Any input?