4-way; compared to BC II with the new Celestion CF 2000 tweeter, additional mid/bass chassis 12 inches, additional transfer point 700 Hz; 20 W higher load capacity, see link.
Replacement by SA3 (lt review HiFi Choice 12/2019)
hifinews.com , Vintage section of December 22, 2014, retrieved on January 5, 2020.
Instructions BCI - III (English), see in particular page 7, (PDF, 1.1 MB), retrieved on January 5, 2020.