Chamfering for bass driver (newbie!)

[igy137]

Is it necessary to chamfer holes for bass drivers?
Planned front plate is 3x18mm or 4x18mm thick.
I made some drawings in sketchup with the driver to visualize, but cannot decide which'd be the optimal in terms of stability and airflow.
What do you think?
Thx,
igy

[Bear]

I'm not sure I see a lot of difference between D and E. Depending upon your tolerance for minutia, D, E or F would be preferred for smaller drivers. For a 26cm/10in driver, you can probably get by with almost any of them.

[---k---]

I need help with my metric...

I vote C

[gmed]

I vote C as well

[igy137]

Thanks for the answers so far!
Oops, there's really no difference between D and E, it was done late at night
That's going to be a (actually two) scan-speak 26w with the baffle 3x or 4x 3/4" baltic birch plywood.

[David G]

Its a balance between giving the driver breathing space, and keeping the baffle as strong as possible. C is the best compromise.

[cjd]

Woohoo! I'm winning... or is it Curt that is...

I tend to use a combination of bits to create an ogee profile where I don't have room on the back to fully relieve around the driver without getting into the area where the sides glue up. As with chamfer vs round-over, you smooth out the distribution of artifacts using smooth transitions (duh?) where hard angles tend to concentrate such things.

C

[numberoneoppa]

I am about to do this later today, so this thread is very helpful! Thanks. :P

[Bear]

That's going to be a (actually two) scan-speak 26w with the baffle 3x or 4x 3/4" baltic birch plywood.

Depending upon the size of the baffle and your bracing structure, this could be serious, serious overkill. awesome! :T ;x(