sbring wrote:
Among speaker projects I am thinking about, now that I am reitred, is a
1972 Bailey t-line system. The cabinet seems no big problem; Bailey has
all the necessary measurements in his article. Driver choices and
passive three-way crossover deisgn seem much more difficult. My budget
is not impressive, so I would like to build the crossovers myself, but
I don't know enough to design them. Any recommendations concerning
choice of drivers and crossover design are welcome!

The Bailey used a B139 if I recall correctly.
I don't have their catalog to hand but Wilmslow Audio list a
modern equivalent (circular, not oval) so the original Bailey
cabinet should be OK. Wilmslow may also do a kit of drivers
and crossovers using this woofer, which will solve your problems.

On the other hand, passive crossovers are rather passé and expensive.
Why not get a Behringer digital gizmo with programmable crossovers
and delays?

--
Eiron

I have no spirit to play with you; your dearth of judgment renders you
tedious - Ben Jonson.