Loudspeaker Physics and Forced Vibration

William H. (Bill) Watkins was a true American audio innovator. Developer of the famous Watkins "Dual-Drive Woofer", the renowned WE-1 large floor-standing speaker system, the recently introduced compact Generation 4 unit, and numerous other high-performance speakers, he passed away at his home February 1, 2018 in Kingsport, TN.

He was a veteran of the U.S. Army in the Korean War era and served in active duty overseas. In his youth he became an accomplished musician, especially on the mandolin, guitar, and violin.

He was also a long-time member of the Audio Engineering Society, which he originally joined in 1974. He maintained an extensive library of AES publications over a span of several decades, which he heavily utilized in his ongoing audio and electroacoustics research and development activities.

He also authored a landmark article on the technology, "New Loudspeaker with Extended Bass," in the December 1974 edition of Audio magazine. The patented concept was subsequently licensed to Infinity Systems in California for use in many of their high-end speaker systems and soon became widely known as the "Infinity/Watkins" Woofer. In 1982 Watkins collaborated with his son Bill Jr. on a second patent, U.S. #4,443,744, on reviewer-acclaimed sound-damping panels for home listening use, later marketed as the Watkins Echo Muffs. A third patent, on resistively damped crossover networks to optimize speaker transient response, U.S. #4,475,233, was issued to Watkins in 1984.

His prolific speaker design career continued into the 21st century, culminating in the current highly reviewed compact Generation 4, a two-way system incorporating multiple patent-pending features to assure unusually wide, smooth frequency response, along with precise damping and stereo imaging from a small (½ ft ³ ) enclosure.