In This Section
- AES Opens Early Registration and Discounted Pricing for 140th International Convention in Paris, June 4 – 7
- FREE "Exhibits-Plus" Badge and premium "All Access" Badge options now available online for Europe’s largest pro audio event of the year
- The Audio Engineering Society Launches AES Live Online Video Collection
- Exclusive videos featuring interviews with past, present and future leaders of our industry
- Binaural Listening Trends Tracked at 140th International Audio Engineering Society Convention
- An ever-expanding aspect of present-day audio
- Call for Board of Governors Nominations
- Deadline is February 15th
The research paper in 1925 by Chester W. Rice and Edward W. Kellogg at General Electric was important in establishing the basic principle of the direct-radiator loudspeaker with a small coil-driven mass-controlled diaphragm in a baffle with a broad midfrequency range of uniform response. Edward Wente at Bell Labs had independently discovered this same principle, filed patent No. 1,812,389 Apr. 1, 1925, granted June 30, 1931. The Rice-Kellogg 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 a.c. powered radios.
- Rice, Chester W. and Edward W. Kellogg, "Notes on the Development of a New Type of Hornless Loudspeaker," Transactions of the American Institute of Electrical Engineers 44, 1925, p. 461-475
- 2001 by Steven E. Schoenherr. All rights reserved.
Return to Recording Technology History Notes | Loudspeaker History | this page revised Jan. 25, 2001