on my last projects i used a 1/4 straight bit with jasper jig. i just wasnt happy with the surface where the speaker sat. The outside of the hole was nice and clean. I think i will splurge for a freude bit ,i dont want any doubts on these speakers.I didnt bother to round over the inside,guess it couldnt hurt.

DOG is GOD spelled backwards.
What others think of me is none of my business.
M80 V3 MY GLOSS Cherry