Avondale Audio - On a technical note: The Zobel network. This seemingly innucuous collection of just three or four components has never, to my mind, been explained fully in its use. Visiting
IC Audio Power Amplifiers and Zobel Networks: One Size Does Not Fit All - EE Times
Question about audio amplifier circuit - Electrical Engineering Stack Exchange
Zoebel Network - Technical/Restorations - The Klipsch Audio Community