You should also know that the full-range driver is in fact a myth. They
are all dual cone devices with some sort of mechanical crossover

Hi Don - yes, the majority are as above, but I'm talking single cone
here.

http://www.bmm-electronics.com/Produ...roduct_ID=2731

Here's the frequency response:
http://www.bmm-electronics.com/docum...SPH-130ALc.pdf

The Jordan is similar.
http://www.ejjordan.co.uk/drivers/jx92.html

As you can see, you can just about coax enough bass from these
aluminium units and the highs are there. The Monacor isn't as peaky as
the fr suggests. I have a friend with the Jordans and in my opinion
they sound better with no tweeter. He's endlessly working on the
crossover - I think it's better without. Maybe it's a cop-out to not
use a crossover, but crossovers do alter the sound, and I'm not sure
it's worth it in the end.