Center channel Impedance.

[E-Stat]

Don't know who Roger Russel is

You haven't missed anything worthwhile.

I could be wrong here though so may be somebody else can chime in on this.

You are mistaken. I get a similar +6db gain from using double New Advents. Half of the acoustic gain comes from using doubles. The other half comes from the Threshold's added power. Which is not even breathing hard driving that load.

rw