But for general discussion, i think there is something of
note going on in Single Driver Forum discussion that's
worthwhile mentioning.

Not before a few days (weeks now I guess) has the use of
a CNC router been widely discussed as a tool for
machining speaker enclosures.

The 'group build' over there involves one designer and
another fellow who intend to execute the design with his
CNC aparatus.

This brainstorming session has gotten pretty longwinded,
but has shown some real promise. The design concept is for a
backhorn. The CNC setup can make the turns needed to smoothe
out the horn path.

• Layertone backhorn-- photo at post #7