ABSTRACT
Kellog (some sources give name as Kellogg) was a pioneering researcher, who, along with Chester Rice, came up with the basic design of the modern, direct-radiator loudspeaker, which had a small coil-driven mass-controlled diaphragm in a baffle with a broad mid-frequency range and relatively uniform response. (Edward Wente at Bell Labs had independently discovered this same principle, and filed a patent for it in 1925, with the patent granted in 1931.) Kellog and Rice worked for GE, and together they published their “hornless loudspeaker”design in 1925, after five years of work. The Rice-Kellog paper also published an amplifier design that was important in boosting the power transmitted to loudspeakers. In 1926, RCA used this design in the Radiola line of AC powered radios. Kellog also went on to independently design the first electrostatic loudspeaker system in 1929, with a patent being granted on the design in 1934.
