Need help understanding Ohms, E-stats

I asked the manufacturer of my hybrid e-stats, Final Sound, what the impedance swing was for my model, 0.4. Since he's located in Europe, English is not his first language. He's been offering helpful information in his emails, but I'm missing something - perhaps in translation, or perhaps because just I don't get it.

There are two generations of my model. The earlier one has just one set of binding posts; the latter one (mine) has two sets - one for the panel, the other for the cone driver woofer. (I'm bi-wiring.)

He said that with the latter model, the panel's impedance would go down to .5 ohm at loud volume. But, with the earlier model (one set of binding posts), the impedance would be only 6 ohms. I'm assuming that there is a difference in the way the internal crossover is designed.

Does this make sense? If so, I'd appreciate some educating. Thanks!

You've got good reason to be confused - I don't understand
part of it either.

First, it's the electrostatic panel that's the problematic
actor here. Secondly, the impedance of the panel doesn't
drop to 0.5 ohms at loud volume - at high frequency; yes -
but not high volume.

Let's assume that the woofer is a 6 ohm woofer. The bi-wire
model - with two sets of binding posts - can probably be
used with a single wire pair by putting in a jumper. That
puts the woofer in parallel with the panel. So when the
panel impedance drops - the fact that you have a 6 ohm
woofer in parallel with the low impedance doesn't make any
difference - your amp still sees a low impedance.

When speaker manufactures supply only a single pair of
binding posts - the jumper is on the inside - the two
drivers are still in parallel and the above applies.

The only thing I can think of is that the earlier model
puts the woofer in series with the panel. That way the
impedance of the system will not drop below that of the

That's not the usual way - but perhaps that's what Final
did in order to "tame" the low impedance of the panel -
and give a more benign impedance for the system.

Dr. Gregory Greenman