By days in the late 1960s and early 1970s, Spencer Hughes worked as part of the BBC's loudspeaker research team. Among other accomplishments, he helped develop the 5" midrange/woofer for the fabled LS3/5A loudspeaker.
As speaker designers from Henry Kloss to Sonus Faber's Franco Serblin have told me, designing a successful 5" driver is "a doddle" (British for easy) compared to creating an 8" or larger cone. "It becomes harder to maintain clarity, focus, speed, and…