Hi Bill,

Yes there is a lot of frustration with the variance
in cutouts doing it with hand tools.

I have used a 3" hole saw. Any problems handling
a 4" hole saw in a standard hand drill without having
forearms like Popeye the Sailor? ;-)

Are there any speed and power issues?

Anyway, right now I am still making a sample build
of a line array with 50 cent speaks and scraps. Foam
insulation used to gasket the mounting fills in the
gaps for now.

Is chamfering the backside of the cutout part of
your technique for the line array? (Maybe should take this
into the line array forum.)

I am learning how to do parallel hookup with these
with alligator clip leads: plus to plus and minus to minus.