Voigt Pipe
 

Someone gave me a pair of Castle Harlech speakers with one of the
drivers missing.
Imagine my surprise when I discovered that each cabinet has, not one,
but two separate Voigt pipes.
The front half of the box has the woofer and tweeter in a folded pipe.
The rear half has another woofer on top pointing upwards in a second VP,
and both pipes are vented on the base, where a second bottom panel is spaced
4mm away from the actual base to create a restrictive vent.

It's as if the marketing men asked Keith what he wanted to see in a
speaker and built exactly that!

I expect that a few minutes with a jigsaw will convert the innards into
something sensible. :-)

--
Eiron.