"The Manhattans"

A while ago I was given a pair of Kef Concertos (I think) with the B139 woofer and T15 tweeter. The cabinets were very water damaged.  Knowing that the B139 has issues up in its midrange band, I decided to add a mid driver. The Vifa C13WG was available at a half price sale and was the obvious candidate, being that is looked sort of like a Kef  B110. The T15's were getting on a bit and a Foster ribbon driver was available at a low price to augment its top end.
The result was a 4-way speaker. Initial x-o points set at 220, 1500 and 7500, but will probably end up around 275, 1500 and 9000.

It was decided to put the Kef B139 in a TL cabinet, the final dimensions being very close to those used in the Rogers L/S speaker, but with a slightly difference in driver position.  This was constructed as a single cabinet so that I could play with it later if I wanted.

The Vifa C13, Kef T15 and Foster ribbon were put into a sort of pyramid cabinet with the drivers as close as possible together.  A slight sloped baffle was applied to try to vertically align the drivers as much as practicable.

Because there was little room for big coils in the top unit, it was decided to use a split series x-o, in a 3-way linked + cascaded bass.  This meant only 2 wires needed to be connected to the top unit.  These were connected via magnetic connectors from the Jaycar security components catalog. These seem to give a very good connection. If they prove to be unreliable, I'll look for some sort of spring pressure contact.

Here are pics of the the progress speaker and probably x-o design

One day I will actually get around to painting or otherwise finishing these speakers !!