"Mechanical Crossovers"

The mid/tweet in the Theil 2.4 is described as "coincident / coaxial", and the crossover is mechanical.

As are the biflex Altec drivers.

Interesting. Flame on if this is old news.....

http://thielaudio.com/THIEL_Site05/P...icoildiag.html

http://www.lansingheritage.org/image...420a/page1.jpg