One could do the same thing with a band saw or belt sander, depending
on what tools were available; a pair of locating pins would help for the
cutting/sanding as well as the glue-up (this may have been part of the
referred-to jig... I don't recall).
(...or do what I see now that Eso just posted...took me a minute to figure
out which way to orient the plywood vs the plane cuts
)
With the Altec drivers, you'd either need adapters (1.4->2", then 2"->
rectangular such as the JBL 2328 to fit the 2397 wood interface), or
make your own, perhaps reducing the distance between top/bottom
:dont-know ... sort of like what Johnny did here:
http://audioheritage.org/vbulletin/s...ead.php?t=5454
I don't recall anyone here doing this such that you could use
their experience.